diff --git a/toolchains/aarch64-linux-gnu-c.toolchain.cmake b/toolchains/aarch64-linux-gnu-c.toolchain.cmake
index cde92c07070..e455e261ea3 100644
--- a/toolchains/aarch64-linux-gnu-c.toolchain.cmake
+++ b/toolchains/aarch64-linux-gnu-c.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR aarch64)
 set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=armv8-a")
 set(CMAKE_CXX_FLAGS "-march=armv8-a")
diff --git a/toolchains/aarch64-linux-gnu.toolchain.cmake b/toolchains/aarch64-linux-gnu.toolchain.cmake
index b9b9f6c44a3..a04f4b24b1d 100644
--- a/toolchains/aarch64-linux-gnu.toolchain.cmake
+++ b/toolchains/aarch64-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR aarch64)
 set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=armv8-a")
 set(CMAKE_CXX_FLAGS "-march=armv8-a")
diff --git a/toolchains/arm-linux-gnueabi-c.toolchain.cmake b/toolchains/arm-linux-gnueabi-c.toolchain.cmake
index 703edb633ad..1c3a2c91e06 100644
--- a/toolchains/arm-linux-gnueabi-c.toolchain.cmake
+++ b/toolchains/arm-linux-gnueabi-c.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR arm)
 set(CMAKE_C_COMPILER "arm-linux-gnueabi-gcc")
 set(CMAKE_CXX_COMPILER "arm-linux-gnueabi-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon")
 set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon")
diff --git a/toolchains/arm-linux-gnueabi.toolchain.cmake b/toolchains/arm-linux-gnueabi.toolchain.cmake
index eed03122c33..e96e0a9b459 100644
--- a/toolchains/arm-linux-gnueabi.toolchain.cmake
+++ b/toolchains/arm-linux-gnueabi.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR arm)
 set(CMAKE_C_COMPILER "arm-linux-gnueabi-gcc")
 set(CMAKE_CXX_COMPILER "arm-linux-gnueabi-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon")
 set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon")
diff --git a/toolchains/arm-linux-gnueabihf-vfpv3-d16.toolchain.cmake b/toolchains/arm-linux-gnueabihf-vfpv3-d16.toolchain.cmake
index 872b7395a19..88d7c675123 100644
--- a/toolchains/arm-linux-gnueabihf-vfpv3-d16.toolchain.cmake
+++ b/toolchains/arm-linux-gnueabihf-vfpv3-d16.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR arm)
 set(CMAKE_C_COMPILER "arm-linux-gnueabihf-gcc")
 set(CMAKE_CXX_COMPILER "arm-linux-gnueabihf-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16")
 set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16")
diff --git a/toolchains/arm-linux-gnueabihf.toolchain.cmake b/toolchains/arm-linux-gnueabihf.toolchain.cmake
index 74ed5bf935a..9a8cee7a401 100644
--- a/toolchains/arm-linux-gnueabihf.toolchain.cmake
+++ b/toolchains/arm-linux-gnueabihf.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR arm)
 set(CMAKE_C_COMPILER "arm-linux-gnueabihf-gcc")
 set(CMAKE_CXX_COMPILER "arm-linux-gnueabihf-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=armv7-a -mfloat-abi=hard -mfpu=neon")
 set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=hard -mfpu=neon")
diff --git a/toolchains/c906-v222.toolchain.cmake b/toolchains/c906-v222.toolchain.cmake
index 1067326e771..02c065e5964 100644
--- a/toolchains/c906-v222.toolchain.cmake
+++ b/toolchains/c906-v222.toolchain.cmake
@@ -17,10 +17,18 @@ set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
 set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
 set(CMAKE_CXX_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
diff --git a/toolchains/c906-v223.toolchain.cmake b/toolchains/c906-v223.toolchain.cmake
index 3e27d18aa55..d20d2d52398 100644
--- a/toolchains/c906-v223.toolchain.cmake
+++ b/toolchains/c906-v223.toolchain.cmake
@@ -17,10 +17,18 @@ set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
 set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
 set(CMAKE_CXX_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
diff --git a/toolchains/c906-v226.toolchain.cmake b/toolchains/c906-v226.toolchain.cmake
index 038799db63e..aab3dd60ee6 100644
--- a/toolchains/c906-v226.toolchain.cmake
+++ b/toolchains/c906-v226.toolchain.cmake
@@ -17,10 +17,18 @@ set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
 set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
 set(CMAKE_CXX_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
diff --git a/toolchains/c906-v240.toolchain.cmake b/toolchains/c906-v240.toolchain.cmake
index 6cdd16684b5..e2a402d1426 100644
--- a/toolchains/c906-v240.toolchain.cmake
+++ b/toolchains/c906-v240.toolchain.cmake
@@ -17,10 +17,18 @@ set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
 set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
 set(CMAKE_CXX_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c906 -DC906=1 -static")
diff --git a/toolchains/c910-v240.toolchain.cmake b/toolchains/c910-v240.toolchain.cmake
index 9d845f90fc8..3b63f6b388b 100644
--- a/toolchains/c910-v240.toolchain.cmake
+++ b/toolchains/c910-v240.toolchain.cmake
@@ -17,10 +17,18 @@ set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
 set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gcxtheadc -mabi=lp64d -mtune=c910 -DC906=1 -static")
 set(CMAKE_CXX_FLAGS "-march=rv64gcxtheadc -mabi=lp64d -mtune=c910 -DC906=1 -static")
diff --git a/toolchains/himix100.toolchain.cmake b/toolchains/himix100.toolchain.cmake
index 17600a131cb..10c600205e5 100644
--- a/toolchains/himix100.toolchain.cmake
+++ b/toolchains/himix100.toolchain.cmake
@@ -1,18 +1,27 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR aarch64 )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
 # when hislicon SDK was installed, toolchain was installed in the path as below: 
-SET ( CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/aarch64-himix100-linux/bin/aarch64-himix100-linux-gcc" )
-SET ( CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/aarch64-himix100-linux/bin/aarch64-himix100-linux-g++" )
-SET ( CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/aarch64-himix100-linux" )
+set(CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/aarch64-himix100-linux/bin/aarch64-himix100-linux-gcc")
+set(CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/aarch64-himix100-linux/bin/aarch64-himix100-linux-g++")
+set(CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/aarch64-himix100-linux")
 
 # set searching rules for cross-compiler
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
-SET ( CMAKE_CXX_FLAGS "-march=armv8-a ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-march=armv8-a ${CMAKE_CXX_FLAGS}")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/himix200.toolchain.cmake b/toolchains/himix200.toolchain.cmake
index 8be5149927e..cf172c6dc2b 100644
--- a/toolchains/himix200.toolchain.cmake
+++ b/toolchains/himix200.toolchain.cmake
@@ -1,21 +1,30 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR arm )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
 # when hislicon SDK was installed, toolchain was installed in the path as below: 
-SET ( CMAKE_C_COMPILER /opt/hisi-linux/x86-arm/arm-himix200-linux/bin/arm-himix200-linux-gcc )
-SET ( CMAKE_CXX_COMPILER /opt/hisi-linux/x86-arm/arm-himix200-linux/bin/arm-himix200-linux-g++ )
+set(CMAKE_C_COMPILER /opt/hisi-linux/x86-arm/arm-himix200-linux/bin/arm-himix200-linux-gcc)
+set(CMAKE_CXX_COMPILER /opt/hisi-linux/x86-arm/arm-himix200-linux/bin/arm-himix200-linux-g++)
 
 # set searching rules for cross-compiler
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
-SET ( CROSS_COMPILATION_ARM himix200 )
-SET ( CROSS_COMPILATION_ARCHITECTURE armv7-a )
+set(CROSS_COMPILATION_ARM himix200)
+set(CROSS_COMPILATION_ARCHITECTURE armv7-a)
 
 # set g++ param
-SET ( CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 ${CMAKE_CXX_FLAGS}")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/hisiv300.toolchain.cmake b/toolchains/hisiv300.toolchain.cmake
index 7f57b9402e6..60496d3944f 100644
--- a/toolchains/hisiv300.toolchain.cmake
+++ b/toolchains/hisiv300.toolchain.cmake
@@ -1,18 +1,27 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR arm )
-# when hislicon SDK was installed, toolchain was installed in the path as below: 
-SET ( CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv300-linux/target/bin/arm-hisiv300-linux-gcc" )
-SET ( CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv300-linux/target/bin/arm-hisiv300-linux-g++" )
-SET ( CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/arm-hisiv300-linux" )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+# when hislicon SDK was installed, toolchain was installed in the path as below:
+set(CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv300-linux/target/bin/arm-hisiv300-linux-gcc")
+set(CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv300-linux/target/bin/arm-hisiv300-linux-g++")
+set(CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/arm-hisiv300-linux" )
 
 # set searching rules for cross-compiler
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
-SET ( CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 ${CMAKE_CXX_FLAGS}")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/hisiv500.toolchain.cmake b/toolchains/hisiv500.toolchain.cmake
index 7a5e5e67542..a66477bbac5 100644
--- a/toolchains/hisiv500.toolchain.cmake
+++ b/toolchains/hisiv500.toolchain.cmake
@@ -1,18 +1,27 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR arm )
-# when hislicon SDK was installed, toolchain was installed in the path as below: 
-SET ( CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv500-linux/target/bin/arm-hisiv500-linux-gcc" )
-SET ( CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv500-linux/target/bin/arm-hisiv500-linux-g++" )
-SET ( CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/arm-hisiv500-linux" )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+# when hislicon SDK was installed, toolchain was installed in the path as below:
+set(CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv500-linux/target/bin/arm-hisiv500-linux-gcc")
+set(CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv500-linux/target/bin/arm-hisiv500-linux-g++")
+set(CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/arm-hisiv500-linux")
 
 # set searching rules for cross-compiler
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
-SET ( CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 ${CMAKE_CXX_FLAGS}")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/hisiv600.toolchain.cmake b/toolchains/hisiv600.toolchain.cmake
index 7dd123b55c8..2fd30630641 100644
--- a/toolchains/hisiv600.toolchain.cmake
+++ b/toolchains/hisiv600.toolchain.cmake
@@ -1,18 +1,27 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR arm )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
 # when hislicon SDK was installed, toolchain was installed in the path as below: 
-SET ( CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv600-linux/target/bin/arm-hisiv600-linux-gcc" )
-SET ( CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv600-linux/target/bin/arm-hisiv600-linux-g++" )
-SET ( CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/arm-hisiv600-linux" )
+set(CMAKE_C_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv600-linux/target/bin/arm-hisiv600-linux-gcc")
+set(CMAKE_CXX_COMPILER "/opt/hisi-linux/x86-arm/arm-hisiv600-linux/target/bin/arm-hisiv600-linux-g++")
+set(CMAKE_FIND_ROOT_PATH "/opt/hisi-linux/x86-arm/arm-hisiv600-linux")
 
 # set searching rules for cross-compiler
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
-SET ( CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=softfp -mfpu=neon ${CMAKE_CXX_FLAGS}")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/host-c.clang.toolchain.cmake b/toolchains/host-c.clang.toolchain.cmake
index 88a856ff9b3..1b5a40b712b 100755
--- a/toolchains/host-c.clang.toolchain.cmake
+++ b/toolchains/host-c.clang.toolchain.cmake
@@ -1,19 +1,19 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR x86 )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR x86)
 # if gcc/g++ was installed:
-SET ( CMAKE_C_COMPILER "clang" )
-SET ( CMAKE_CXX_COMPILER "clang++" )
+set(CMAKE_C_COMPILER "clang")
+set(CMAKE_CXX_COMPILER "clang++")
 
 # set searching rules
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag
-SET ( CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
 
-set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nodefaultlibs -fno-builtin -nostdinc++ -lc" )
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nodefaultlibs -fno-builtin -nostdinc++ -lc")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/host-c.gcc.toolchain.cmake b/toolchains/host-c.gcc.toolchain.cmake
index 9dd9f242694..655df5fd4a5 100755
--- a/toolchains/host-c.gcc.toolchain.cmake
+++ b/toolchains/host-c.gcc.toolchain.cmake
@@ -1,19 +1,19 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR x86 )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR x86)
 # if gcc/g++ was installed:
-SET ( CMAKE_C_COMPILER "gcc" )
-SET ( CMAKE_CXX_COMPILER "g++" )
+set(CMAKE_C_COMPILER "gcc")
+set(CMAKE_CXX_COMPILER "g++")
 
 # set searching rules
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag
-SET ( CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
 
-set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nodefaultlibs -fno-builtin -nostdinc++ -lc" )
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nodefaultlibs -fno-builtin -nostdinc++ -lc")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
diff --git a/toolchains/host.gcc.toolchain.cmake b/toolchains/host.gcc.toolchain.cmake
index 510a0138660..ad46a86f92d 100644
--- a/toolchains/host.gcc.toolchain.cmake
+++ b/toolchains/host.gcc.toolchain.cmake
@@ -1,14 +1,14 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR x86 )
-# if gcc/g++ was installed: 
-SET ( CMAKE_C_COMPILER "gcc" )
-SET ( CMAKE_CXX_COMPILER "g++" )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR x86)
+# if gcc/g++ was installed:
+set(CMAKE_C_COMPILER "gcc")
+set(CMAKE_CXX_COMPILER "g++")
 
 # set searching rules
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag
-SET ( CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
diff --git a/toolchains/ingenic-x2000.toolchain.cmake b/toolchains/ingenic-x2000.toolchain.cmake
index 4c80f3af6ed..6c3cdfbc2ee 100644
--- a/toolchains/ingenic-x2000.toolchain.cmake
+++ b/toolchains/ingenic-x2000.toolchain.cmake
@@ -14,9 +14,18 @@ set(CMAKE_CXX_COMPILER "${MIPS_ROOT_PATH}/bin/mips-linux-gnu-g++")
 
 set(CMAKE_FIND_ROOT_PATH "${MIPS_ROOT_PATH}/mips-linux-gnu")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=xburst2 -mtune=xburst2 -mfp64 -mnan=2008")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=xburst2 -mtune=xburst2 -mfp64 -mnan=2008")
diff --git a/toolchains/iossimxc-x64.toolchain.cmake b/toolchains/iossimxc-x64.toolchain.cmake
index a4c8a86927a..bfd4f867efd 100644
--- a/toolchains/iossimxc-x64.toolchain.cmake
+++ b/toolchains/iossimxc-x64.toolchain.cmake
@@ -2,11 +2,11 @@
 # set(UNIX True)
 # set(Darwin True)
 # set(IOS True)
-set (CMAKE_SYSTEM_NAME Darwin)
-set (CMAKE_SYSTEM_VERSION 1)
-set (UNIX True)
-set (APPLE True)
-set (IOS True)
+set(CMAKE_SYSTEM_NAME Darwin)
+set(CMAKE_SYSTEM_VERSION 1)
+set(UNIX True)
+set(APPLE True)
+set(IOS True)
 
 # suppress -rdynamic
 # set(CMAKE_SYSTEM_NAME Generic)
diff --git a/toolchains/iossimxc.toolchain.cmake b/toolchains/iossimxc.toolchain.cmake
index 2d30581eb99..75c59ef9226 100644
--- a/toolchains/iossimxc.toolchain.cmake
+++ b/toolchains/iossimxc.toolchain.cmake
@@ -2,11 +2,11 @@
 # set(UNIX True)
 # set(Darwin True)
 # set(IOS True)
-set (CMAKE_SYSTEM_NAME Darwin)
-set (CMAKE_SYSTEM_VERSION 1)
-set (UNIX True)
-set (APPLE True)
-set (IOS True)
+set(CMAKE_SYSTEM_NAME Darwin)
+set(CMAKE_SYSTEM_VERSION 1)
+set(UNIX True)
+set(APPLE True)
+set(IOS True)
 
 # suppress -rdynamic
 # set(CMAKE_SYSTEM_NAME Generic)
diff --git a/toolchains/iosxc-arm64.toolchain.cmake b/toolchains/iosxc-arm64.toolchain.cmake
index 9f270d61647..acc1d4ec7f7 100644
--- a/toolchains/iosxc-arm64.toolchain.cmake
+++ b/toolchains/iosxc-arm64.toolchain.cmake
@@ -2,11 +2,11 @@
 # set(UNIX True)
 # set(Darwin True)
 # set(IOS True)
-set (CMAKE_SYSTEM_NAME Darwin)
-set (CMAKE_SYSTEM_VERSION 1)
-set (UNIX True)
-set (APPLE True)
-set (IOS True)
+set(CMAKE_SYSTEM_NAME Darwin)
+set(CMAKE_SYSTEM_VERSION 1)
+set(UNIX True)
+set(APPLE True)
+set(IOS True)
 
 # suppress -rdynamic
 # set(CMAKE_SYSTEM_NAME Generic)
diff --git a/toolchains/iosxc.toolchain.cmake b/toolchains/iosxc.toolchain.cmake
index 1631b3dc8a6..922f036bfc1 100644
--- a/toolchains/iosxc.toolchain.cmake
+++ b/toolchains/iosxc.toolchain.cmake
@@ -2,11 +2,11 @@
 # set(UNIX True)
 # set(Darwin True)
 # set(IOS True)
-set (CMAKE_SYSTEM_NAME Darwin)
-set (CMAKE_SYSTEM_VERSION 1)
-set (UNIX True)
-set (APPLE True)
-set (IOS True)
+set(CMAKE_SYSTEM_NAME Darwin)
+set(CMAKE_SYSTEM_VERSION 1)
+set(UNIX True)
+set(APPLE True)
+set(IOS True)
 
 # suppress -rdynamic
 # set(CMAKE_SYSTEM_NAME Generic)
diff --git a/toolchains/jetson.toolchain.cmake b/toolchains/jetson.toolchain.cmake
index 993de04c07f..4d4eeab360a 100644
--- a/toolchains/jetson.toolchain.cmake
+++ b/toolchains/jetson.toolchain.cmake
@@ -4,6 +4,19 @@ set(CMAKE_SYSTEM_PROCESSOR aarch64)
 set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++")
 
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
+
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
 # -march=armv8-a could work on Jetson, but will compile without some extra cpu features
 set(CMAKE_C_FLAGS "-march=native ${CMAKE_C_FLAGS}")
diff --git a/toolchains/loongarch64-linux-gnu.toolchain.cmake b/toolchains/loongarch64-linux-gnu.toolchain.cmake
index 7cdfd9dbef8..564115c1ac8 100644
--- a/toolchains/loongarch64-linux-gnu.toolchain.cmake
+++ b/toolchains/loongarch64-linux-gnu.toolchain.cmake
@@ -14,9 +14,18 @@ set(CMAKE_CXX_COMPILER "${LOONGARCH64_ROOT_PATH}/bin/loongarch64-linux-gnu-g++")
 
 set(CMAKE_FIND_ROOT_PATH "${LOONGARCH64_ROOT_PATH}/loongarch64-linux-gnu")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=loongarch64")
 set(CMAKE_CXX_FLAGS "-march=loongarch64")
diff --git a/toolchains/loongarch64-unknown-linux-gnu.toolchain.cmake b/toolchains/loongarch64-unknown-linux-gnu.toolchain.cmake
index 45edc8c9b73..a65865d3552 100644
--- a/toolchains/loongarch64-unknown-linux-gnu.toolchain.cmake
+++ b/toolchains/loongarch64-unknown-linux-gnu.toolchain.cmake
@@ -14,9 +14,18 @@ set(CMAKE_CXX_COMPILER "${LOONGARCH64_ROOT_PATH}/bin/loongarch64-unknown-linux-g
 
 set(CMAKE_FIND_ROOT_PATH "${LOONGARCH64_ROOT_PATH}/loongarch64-unknown-linux-gnu")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=loongarch64")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=loongarch64")
diff --git a/toolchains/loongson2f-linux-gnuabi64.toolchain.cmake b/toolchains/loongson2f-linux-gnuabi64.toolchain.cmake
index c0acb30dad9..c47420468a6 100644
--- a/toolchains/loongson2f-linux-gnuabi64.toolchain.cmake
+++ b/toolchains/loongson2f-linux-gnuabi64.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mips64el)
 set(CMAKE_C_COMPILER "mips64el-linux-gnuabi64-gcc")
 set(CMAKE_CXX_COMPILER "mips64el-linux-gnuabi64-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-mabi=64 -march=mips3 -mtune=loongson2f -mloongson-mmi")
 set(CMAKE_CXX_FLAGS "-mabi=64 -march=mips3 -mtune=loongson2f -mloongson-mmi")
diff --git a/toolchains/mips-mti-linux-gnu.toolchain.cmake b/toolchains/mips-mti-linux-gnu.toolchain.cmake
index 395398f2017..2ed45ce2832 100644
--- a/toolchains/mips-mti-linux-gnu.toolchain.cmake
+++ b/toolchains/mips-mti-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mips)
 set(CMAKE_C_COMPILER "mips-mti-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "mips-mti-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=mips32r6")
 set(CMAKE_CXX_FLAGS "-march=mips32r6")
diff --git a/toolchains/mips32r2-linux-gnu.toolchain.cmake b/toolchains/mips32r2-linux-gnu.toolchain.cmake
index 038072a5192..7d7f11caa6f 100644
--- a/toolchains/mips32r2-linux-gnu.toolchain.cmake
+++ b/toolchains/mips32r2-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mips32el)
 set(CMAKE_C_COMPILER "mips-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "mips-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=mips32r2 -mabi=32 -mnan=2008 -mfp64")
 set(CMAKE_CXX_FLAGS "-march=mips32r2 -mabi=32 -mnan=2008 -mfp64")
diff --git a/toolchains/mips64el-linux-gnuabi64.toolchain.cmake b/toolchains/mips64el-linux-gnuabi64.toolchain.cmake
index 4d41abc7141..69550ac0a55 100644
--- a/toolchains/mips64el-linux-gnuabi64.toolchain.cmake
+++ b/toolchains/mips64el-linux-gnuabi64.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mips64el)
 set(CMAKE_C_COMPILER "mips64el-linux-gnuabi64-gcc")
 set(CMAKE_CXX_COMPILER "mips64el-linux-gnuabi64-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=mips64")
 set(CMAKE_CXX_FLAGS "-march=mips64")
diff --git a/toolchains/mipsel-linux-gnu.toolchain.cmake b/toolchains/mipsel-linux-gnu.toolchain.cmake
index 3c9c5d92402..8fda6078444 100644
--- a/toolchains/mipsel-linux-gnu.toolchain.cmake
+++ b/toolchains/mipsel-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mipsel)
 set(CMAKE_C_COMPILER "mipsel-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "mipsel-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=mips32")
 set(CMAKE_CXX_FLAGS "-march=mips32")
diff --git a/toolchains/mipsisa32r6el-linux-gnu.toolchain.cmake b/toolchains/mipsisa32r6el-linux-gnu.toolchain.cmake
index 156fb3b97ca..174c8947975 100644
--- a/toolchains/mipsisa32r6el-linux-gnu.toolchain.cmake
+++ b/toolchains/mipsisa32r6el-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mipsisa32r6el)
 set(CMAKE_C_COMPILER "mipsisa32r6el-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "mipsisa32r6el-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=mips32r6")
 set(CMAKE_CXX_FLAGS "-march=mips32r6")
diff --git a/toolchains/mipsisa64r6el-linux-gnuabi64.toolchain.cmake b/toolchains/mipsisa64r6el-linux-gnuabi64.toolchain.cmake
index baf18e03300..671c068de19 100644
--- a/toolchains/mipsisa64r6el-linux-gnuabi64.toolchain.cmake
+++ b/toolchains/mipsisa64r6el-linux-gnuabi64.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR mipsisa64r6el)
 set(CMAKE_C_COMPILER "mipsisa64r6el-linux-gnuabi64-gcc")
 set(CMAKE_CXX_COMPILER "mipsisa64r6el-linux-gnuabi64-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=mips64r6 -mmsa -mhard-float -mfp64 -mnan=2008")
 set(CMAKE_CXX_FLAGS "-march=mips64r6 -mmsa -mhard-float -mfp64 -mnan=2008")
diff --git a/toolchains/pi3.toolchain.cmake b/toolchains/pi3.toolchain.cmake
index 19e4c2650b6..87ff45fa318 100644
--- a/toolchains/pi3.toolchain.cmake
+++ b/toolchains/pi3.toolchain.cmake
@@ -4,6 +4,19 @@ set(CMAKE_SYSTEM_PROCESSOR armv7l)
 set(CMAKE_C_COMPILER "gcc")
 set(CMAKE_CXX_COMPILER "g++")
 
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
+
 set(CMAKE_C_FLAGS "-march=native -mfpu=neon -mfloat-abi=hard ${CMAKE_C_FLAGS}")
 set(CMAKE_CXX_FLAGS "-march=native -mfpu=neon -mfloat-abi=hard ${CMAKE_CXX_FLAGS}")
 
diff --git a/toolchains/power8le-linux-gnu-vsx.clang.toolchain.cmake b/toolchains/power8le-linux-gnu-vsx.clang.toolchain.cmake
index 06a18751f46..92d36b8e25f 100644
--- a/toolchains/power8le-linux-gnu-vsx.clang.toolchain.cmake
+++ b/toolchains/power8le-linux-gnu-vsx.clang.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR powerpc64le)
 set(CMAKE_C_COMPILER "clang")
 set(CMAKE_CXX_COMPILER "clang++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-target powerpc64le-linux-gnu -I/usr/powerpc64le-linux-gnu/include -mcpu=power8 -mtune=power8 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
 set(CMAKE_CXX_FLAGS "-target powerpc64le-linux-gnu -I/usr/powerpc64le-linux-gnu/include -I/usr/powerpc64le-linux-gnu/include/c++/10/powerpc64le-linux-gnu -mcpu=power8 -mtune=power8 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
diff --git a/toolchains/power8le-linux-gnu-vsx.toolchain.cmake b/toolchains/power8le-linux-gnu-vsx.toolchain.cmake
index e5870341e67..8785fa6941d 100644
--- a/toolchains/power8le-linux-gnu-vsx.toolchain.cmake
+++ b/toolchains/power8le-linux-gnu-vsx.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR powerpc64le)
 set(CMAKE_C_COMPILER "powerpc64le-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "powerpc64le-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-mcpu=power8 -mtune=power8 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
 set(CMAKE_CXX_FLAGS "-mcpu=power8 -mtune=power8 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
diff --git a/toolchains/power9le-linux-gnu-vsx.clang.toolchain.cmake b/toolchains/power9le-linux-gnu-vsx.clang.toolchain.cmake
index 4a4438cf0bb..58ed9bd95a9 100644
--- a/toolchains/power9le-linux-gnu-vsx.clang.toolchain.cmake
+++ b/toolchains/power9le-linux-gnu-vsx.clang.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR powerpc64le)
 set(CMAKE_C_COMPILER "clang")
 set(CMAKE_CXX_COMPILER "clang++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-target powerpc64le-linux-gnu -I/usr/powerpc64le-linux-gnu/include -mcpu=power9 -mtune=power9 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
 set(CMAKE_CXX_FLAGS "-target powerpc64le-linux-gnu -I/usr/powerpc64le-linux-gnu/include -I/usr/powerpc64le-linux-gnu/include/c++/10/powerpc64le-linux-gnu -mcpu=power9 -mtune=power9 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
diff --git a/toolchains/power9le-linux-gnu-vsx.toolchain.cmake b/toolchains/power9le-linux-gnu-vsx.toolchain.cmake
index 5c0c9d8b299..6e9a51e3e12 100644
--- a/toolchains/power9le-linux-gnu-vsx.toolchain.cmake
+++ b/toolchains/power9le-linux-gnu-vsx.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR powerpc64le)
 set(CMAKE_C_COMPILER "powerpc64le-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "powerpc64le-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-mcpu=power9 -mtune=power9 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
 set(CMAKE_CXX_FLAGS "-mcpu=power9 -mtune=power9 -DNO_WARN_X86_INTRINSICS -D__MMX__ -D__SSE__ -D__SSSE3__")
diff --git a/toolchains/powerpc-linux-gnu.toolchain.cmake b/toolchains/powerpc-linux-gnu.toolchain.cmake
index a1be1bb919b..34aeb9fd4dd 100644
--- a/toolchains/powerpc-linux-gnu.toolchain.cmake
+++ b/toolchains/powerpc-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR powerpc)
 set(CMAKE_C_COMPILER "powerpc-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "powerpc-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-mcpu=powerpc")
 set(CMAKE_CXX_FLAGS "-mcpu=powerpc")
diff --git a/toolchains/powerpc64le-linux-gnu.toolchain.cmake b/toolchains/powerpc64le-linux-gnu.toolchain.cmake
index 89ee6788783..848b5a70be1 100644
--- a/toolchains/powerpc64le-linux-gnu.toolchain.cmake
+++ b/toolchains/powerpc64le-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR powerpc64le)
 set(CMAKE_C_COMPILER "powerpc64le-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "powerpc64le-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-mcpu=powerpc64le")
 set(CMAKE_CXX_FLAGS "-mcpu=powerpc64le")
diff --git a/toolchains/qnx700.toolchain.cmake b/toolchains/qnx700.toolchain.cmake
index 7163180447a..bc3eaa64046 100644
--- a/toolchains/qnx700.toolchain.cmake
+++ b/toolchains/qnx700.toolchain.cmake
@@ -6,18 +6,27 @@ set(CMAKE_SYSTEM_NAME QNX)
 set(CMAKE_SYSTEM_PROCESSOR arm)
 
 if(NOT DEFINED ENV{QNX_HOST})
-  message(FATAL_ERROR "Please set env var `QNX_HOST` first")
+    message(FATAL_ERROR "Please set env var `QNX_HOST` first")
 endif()
 set(QNX_HOST "$ENV{QNX_HOST}")
 
 if(NOT DEFINED ENV{QNX_TARGET})
-  message(FATAL_ERROR "Please set env var `QNX_TARGET` first")
+    message(FATAL_ERROR "Please set env var `QNX_TARGET` first")
 endif()
 set(QNX_TARGET "$ENV{QNX_TARGET}")
 
 set(CMAKE_C_COMPILER "${QNX_HOST}/usr/bin/aarch64-unknown-nto-qnx7.0.0-gcc-5.4.0")
 set(CMAKE_CXX_COMPILER "${QNX_HOST}/usr/bin/aarch64-unknown-nto-qnx7.0.0-g++-5.4.0")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
\ No newline at end of file
diff --git a/toolchains/qnx710.toolchain.cmake b/toolchains/qnx710.toolchain.cmake
index aa3e45be6b5..c2d74a83f70 100644
--- a/toolchains/qnx710.toolchain.cmake
+++ b/toolchains/qnx710.toolchain.cmake
@@ -10,18 +10,27 @@ set(CMAKE_SYSTEM_NAME QNX)
 set(CMAKE_SYSTEM_PROCESSOR aarch64le)
 
 if(NOT DEFINED ENV{QNX_HOST})
-  message(FATAL_ERROR "Please set env var `QNX_HOST` first")
+    message(FATAL_ERROR "Please set env var `QNX_HOST` first")
 endif()
 set(QNX_HOST "$ENV{QNX_HOST}")
 
 if(NOT DEFINED ENV{QNX_TARGET})
-  message(FATAL_ERROR "Please set env var `QNX_TARGET` first")
+    message(FATAL_ERROR "Please set env var `QNX_TARGET` first")
 endif()
 set(QNX_TARGET "$ENV{QNX_TARGET}")
 
 set(CMAKE_C_COMPILER "${QNX_HOST}/usr/bin/aarch64-unknown-nto-qnx7.1.0-gcc-8.3.0")
 set(CMAKE_CXX_COMPILER "${QNX_HOST}/usr/bin/aarch64-unknown-nto-qnx7.1.0-g++-8.3.0")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
diff --git a/toolchains/riscv32-unknown-elf.toolchain.cmake b/toolchains/riscv32-unknown-elf.toolchain.cmake
index 056fcc842fa..624886b22ac 100644
--- a/toolchains/riscv32-unknown-elf.toolchain.cmake
+++ b/toolchains/riscv32-unknown-elf.toolchain.cmake
@@ -14,6 +14,15 @@ set(CMAKE_CXX_COMPILER "${RISCV_ROOT_PATH}/bin/riscv32-unknown-elf-g++")
 
 set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv32-unknown-elf")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
diff --git a/toolchains/riscv64-linux-gnu.toolchain.cmake b/toolchains/riscv64-linux-gnu.toolchain.cmake
index 7df25e191b3..cb534a8581a 100644
--- a/toolchains/riscv64-linux-gnu.toolchain.cmake
+++ b/toolchains/riscv64-linux-gnu.toolchain.cmake
@@ -4,9 +4,18 @@ set(CMAKE_SYSTEM_PROCESSOR riscv64)
 set(CMAKE_C_COMPILER "riscv64-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "riscv64-linux-gnu-g++")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gc")
 set(CMAKE_CXX_FLAGS "-march=rv64gc")
diff --git a/toolchains/riscv64-unknown-elf.toolchain.cmake b/toolchains/riscv64-unknown-elf.toolchain.cmake
index f2bebbaf1f1..275197319b0 100644
--- a/toolchains/riscv64-unknown-elf.toolchain.cmake
+++ b/toolchains/riscv64-unknown-elf.toolchain.cmake
@@ -14,6 +14,15 @@ set(CMAKE_CXX_COMPILER "${RISCV_ROOT_PATH}/bin/riscv64-unknown-elf-g++")
 
 set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-elf")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
\ No newline at end of file
diff --git a/toolchains/riscv64-unknown-linux-gnu.llvm-toolchain.cmake b/toolchains/riscv64-unknown-linux-gnu.llvm-toolchain.cmake
index 953f21aaf95..e9c6ad29e2a 100644
--- a/toolchains/riscv64-unknown-linux-gnu.llvm-toolchain.cmake
+++ b/toolchains/riscv64-unknown-linux-gnu.llvm-toolchain.cmake
@@ -16,9 +16,18 @@ set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 set(CMAKE_C_COMPILER_TARGET "riscv64-unknown-linux-gnu")
 set(CMAKE_CXX_COMPILER_TARGET "riscv64-unknown-linux-gnu")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # add --ld-path=${RISCV_ROOT_PATH}/bin/riscv64-unknown-linux-gnu-ld or append $RISCV_ROOT_PATH/bin to PATH.
 set(CMAKE_C_FLAGS "--gcc-toolchain=${RISCV_ROOT_PATH} -march=rv64gc")
diff --git a/toolchains/riscv64-unknown-linux-gnu.toolchain.cmake b/toolchains/riscv64-unknown-linux-gnu.toolchain.cmake
index 10603262223..eaf3bf4ed99 100644
--- a/toolchains/riscv64-unknown-linux-gnu.toolchain.cmake
+++ b/toolchains/riscv64-unknown-linux-gnu.toolchain.cmake
@@ -14,9 +14,18 @@ set(CMAKE_CXX_COMPILER "${RISCV_ROOT_PATH}/bin/riscv64-unknown-linux-gnu-g++")
 
 set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=rv64gc")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=rv64gc")
diff --git a/toolchains/th1520-v240.toolchain.cmake b/toolchains/th1520-v240.toolchain.cmake
index fb9787a8263..117d6a55c46 100644
--- a/toolchains/th1520-v240.toolchain.cmake
+++ b/toolchains/th1520-v240.toolchain.cmake
@@ -17,10 +17,18 @@ set(CMAKE_FIND_ROOT_PATH "${RISCV_ROOT_PATH}/riscv64-unknown-linux-gnu")
 
 set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
 
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 set(CMAKE_C_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c910 -DC906=1 -static")
 set(CMAKE_CXX_FLAGS "-march=rv64gcv0p7_zfh_xtheadc -mabi=lp64d -mtune=c910 -DC906=1 -static")
diff --git a/toolchains/v831.toolchain.cmake b/toolchains/v831.toolchain.cmake
index a36b54fe84c..4f0fc011c23 100644
--- a/toolchains/v831.toolchain.cmake
+++ b/toolchains/v831.toolchain.cmake
@@ -1,18 +1,27 @@
 # set cross-compiled system type, it's better not use the type which cmake cannot recognized.
-SET ( CMAKE_SYSTEM_NAME Linux )
-SET ( CMAKE_SYSTEM_PROCESSOR arm )
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
 # when hislicon SDK was installed, toolchain was installed in the path as below: 
-SET ( CMAKE_C_COMPILER "/opt/v831-toolchain/bin/arm-openwrt-linux-gcc" )
-SET ( CMAKE_CXX_COMPILER "/opt/v831-toolchain/bin/arm-openwrt-linux-g++" )
-SET ( CMAKE_FIND_ROOT_PATH "/opt/v831-toolchain" )
+set(CMAKE_C_COMPILER "/opt/v831-toolchain/bin/arm-openwrt-linux-gcc")
+set(CMAKE_CXX_COMPILER "/opt/v831-toolchain/bin/arm-openwrt-linux-g++")
+set(CMAKE_FIND_ROOT_PATH "/opt/v831-toolchain")
 
 # set searching rules for cross-compiler
-SET ( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-SET ( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
+    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+endif()
 
 # set ${CMAKE_C_FLAGS} and ${CMAKE_CXX_FLAGS}flag for cross-compiled process
-SET ( CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=hard -mfpu=neon ${CMAKE_CXX_FLAGS}" )
+set(CMAKE_CXX_FLAGS "-march=armv7-a -mfloat-abi=hard -mfpu=neon ${CMAKE_CXX_FLAGS}")
 
 # cache flags
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")