Fixing build with VS

Fixes #29 Missing FindSetEnv.cmake when building with VS 2019 command prompt

CMakeLists.txt

@@ -6,6 +6,17 @@ project(mdcomp
     LANGUAGES CXX ASM
 )
 
+# Joins arguments and places the results in ${result_var}.
+function(join result_var)
+    set(result "")
+    foreach (arg ${ARGN})
+        set(result "${result}${arg}")
+    endforeach ()
+    set(${result_var} "${result}" PARENT_SCOPE)
+endfunction()
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/support/cmake")
+
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 option(FORCE_COLORED_OUTPUT "Always produce ANSI-colored output (GNU/Clang only)." TRUE)
@@ -228,10 +239,10 @@ if(CMAKE_GENERATOR MATCHES "Visual Studio")
     endif()
 
     # Set FrameworkPathOverride to get rid of MSB3644 warnings.
-    set(netfxpath "C:\\Program Files\\Reference Assemblies\\Microsoft\\Framework\\.NETFramework\\v4.0")
+    join(netfxpath "C:\\Program Files\\Reference Assemblies\\Microsoft\\Framework\\.NETFramework\\v4.0")
     file(WRITE run-msbuild.bat "
-    ${MSBUILD_SETUP}
-    ${CMAKE_MAKE_PROGRAM} -p:FrameworkPathOverride=\"${netfxpath}\" %*")
+        ${MSBUILD_SETUP}
+        ${CMAKE_MAKE_PROGRAM} -p:FrameworkPathOverride=\"${netfxpath}\" %*")
 endif()
 
 set(COMMON_HEADERS

include/mdcomp/bigendian_io.hh

@@ -59,6 +59,14 @@
 #    define PURE_INLINE
 #endif
 
+#ifdef _MSC_VER
+#    ifndef __clang__
+[[noreturn]] inline void __builtin_unreachable() {
+    __assume(false);
+}
+#    endif
+#endif
+
 namespace detail {
     // Meta-programming stuff.
 

include/mdcomp/lzss.hh

@@ -38,14 +38,6 @@
 #include <variant>
 #include <vector>
 
-#ifdef _MSC_VER
-#    ifndef __clang__
-[[noreturn]] inline void __builtin_unreachable() {
-    __assume(false);
-}
-#    endif
-#endif
-
 /*
  * Class representing an edge in the LZSS-compression graph. An edge (u, v)
  * indicates that there is a sliding window match that covers all the characters
@@ -275,9 +267,9 @@ concept lzss_adaptor = requires {
     requires !std::same_as<typename T::descriptor_t, bool>;
     requires std::is_class_v<typename T::descriptor_endian_t>;
     requires std::is_enum_v<typename T::edge_type>;
-    { T::edge_type::invalid } -> std::same_as<typename T::edge_type>;
-    { T::edge_type::terminator } -> std::same_as<typename T::edge_type>;
-    { T::edge_type::symbolwise } -> std::same_as<typename T::edge_type>;
+    { T::edge_type::invalid };
+    { T::edge_type::terminator };
+    { T::edge_type::symbolwise };
     requires std::same_as<decltype(T::num_desc_bits), size_t const>;
     requires std::same_as<decltype(T::need_early_descriptor), bool const>;
     requires std::same_as<decltype(T::descriptor_bit_order), bit_endian const>;

support/cmake/FindSetEnv.cmake

@@ -0,0 +1,7 @@
+# A CMake script to find SetEnv.cmd.
+
+find_program(WINSDK_SETENV NAMES SetEnv.cmd
+    PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Microsoft SDKs\\Windows;CurrentInstallFolder]/bin")
+if (WINSDK_SETENV AND PRINT_PATH)
+    execute_process(COMMAND ${CMAKE_COMMAND} -E echo "${WINSDK_SETENV}")
+endif ()