Libcurl CMake adaptations (#10249)

* Enable using more recent CMake versions
Remove default build type
Add OpenSSL using imported targets
PreTarget and PostTarget scripts
Do not build as shared by default
Fix typos

* Default to building shared libraries

* Remove add_compile_definitions()
Correctly add target link libraries

* Fix syntax

* Fix Indentation

modules/openapi-generator/src/main/resources/C-libcurl/CMakeLists.txt.mustache

@@ -1,34 +1,39 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 2.6...3.10.2)
 project (CGenerator)
 
 cmake_policy(SET CMP0063 NEW)
 
 set(CMAKE_C_VISIBILITY_PRESET default)
 set(CMAKE_CXX_VISIBILITY_PRESET default)
 set(CMAKE_VISIBILITY_INLINES_HIDDEN OFF)
-set(CMAKE_BUILD_TYPE Debug)
+
+option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
 
 find_package(OpenSSL)
 
 if (OPENSSL_FOUND)
-	message (STATUS "OPENSSL found")
-	set (CMAKE_C_FLAGS "-DOPENSSL")
-	include_directories(${OPENSSL_INCLUDE_DIR})
-	include_directories(${OPENSSL_INCLUDE_DIRS})
-	link_directories(${OPENSSL_LIBRARIES})
-	message(STATUS "Using OpenSSL ${OPENSSL_VERSION}")
+    message (STATUS "OPENSSL found")
+
+    set(CMAKE_C_FLAGS "-DOPENSSL")
+    if(CMAKE_VERSION VERSION_LESS 3.4)
+        include_directories(${OPENSSL_INCLUDE_DIR})
+        include_directories(${OPENSSL_INCLUDE_DIRS})
+        link_directories(${OPENSSL_LIBRARIES})
+    endif()
+
+    message(STATUS "Using OpenSSL ${OPENSSL_VERSION}")
 else()
-	message (STATUS "OpenSSL Not found.")
+    message (STATUS "OpenSSL Not found.")
 endif()
 
 set(pkgName "{{projectName}}")
 
 find_package(CURL 7.58.0 REQUIRED)
 if(CURL_FOUND)
-	include_directories(${CURL_INCLUDE_DIR})
-	set(PLATFORM_LIBRARIES ${PLATFORM_LIBRARIES} ${CURL_LIBRARIES} )
+    include_directories(${CURL_INCLUDE_DIR})
+    set(PLATFORM_LIBRARIES ${PLATFORM_LIBRARIES} ${CURL_LIBRARIES} )
 else(CURL_FOUND)
-	message(FATAL_ERROR "Could not find the CURL library and development files.")
+    message(FATAL_ERROR "Could not find the CURL library and development files.")
 endif()
 
 set(SRCS
@@ -75,10 +80,18 @@ set(HDRS
 
 )
 
-# Add library with project file with projectname as library name
-add_library(${pkgName} SHARED ${SRCS} ${HDRS})
+include(PreTarget OPTIONAL)
+
+# Add library with project file with project name as library name
+add_library(${pkgName} ${SRCS} ${HDRS})
 # Link dependent libraries
+if(NOT CMAKE_VERSION VERSION_LESS 3.4)
+    target_link_libraries(${pkgName} OpenSSL::SSL OpenSSL::Crypto)
+endif()
 target_link_libraries(${pkgName} ${CURL_LIBRARIES} )
+
+include(PostTarget OPTIONAL)
+
 #install library to destination
 install(TARGETS ${pkgName} DESTINATION ${CMAKE_INSTALL_PREFIX})
 
@@ -87,7 +100,7 @@ set(SRCS "")
 set(HDRS "")
 
 
-## This section shows how to use the above compiled libary to compile the source files
+## This section shows how to use the above compiled library to compile the source files
 ## set source files
 #set(SRCS
 {{#apiInfo}}
@@ -105,12 +118,12 @@ set(HDRS "")
 
 ## loop over all files in SRCS variable
 #foreach(SOURCE_FILE ${SRCS})
-#    # Get only the file name from the file as add_executable doesnot support executable with slash("/")
+#    # Get only the file name from the file as add_executable does not support executable with slash("/")
 #    get_filename_component(FILE_NAME_ONLY ${SOURCE_FILE} NAME_WE)
 #    # Remove .c from the file name and set it as executable name
 #    string( REPLACE ".c" "" EXECUTABLE_FILE ${FILE_NAME_ONLY})
 #    # Add executable for every source file in  SRCS
 #    add_executable(unit-${EXECUTABLE_FILE} ${SOURCE_FILE})
-#    # Link above created libary to executable and dependent libary curl
+#    # Link above created library to executable and dependent libary curl
 #    target_link_libraries(unit-${EXECUTABLE_FILE} ${CURL_LIBRARIES} ${pkgName} )
 #endforeach(SOURCE_FILE ${SRCS})