[CMake] Add RCC platform configuration checks

1 files changed, 54 insertions, 0 deletions

diff --git a/rcc/cmake/modules/HandleRCCStdlib.cmake b/rcc/cmake/modules/HandleRCCStdlib.cmake
new file mode 100644
index 0000000..5dcaf2e
--- /dev/null
+++ b/rcc/cmake/modules/HandleRCCStdlib.cmake
@@ -0,0 +1,54 @@
+# This CMake module is responsible for setting the standard library to libc++
+# if the user has requested it.
+
+include(DetermineGCCCompatible)
+
+if(NOT DEFINED RCC_STDLIB_HANDLED)
+  set(RCC_STDLIB_HANDLED ON)
+
+  function(append value)
+    foreach(variable ${ARGN})
+      set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
+    endforeach(variable)
+  endfunction()
+
+  include(CheckCXXCompilerFlag)
+  include(CheckLinkerFlag)
+  set(RCC_LIBCXX_USED 0)
+  if(RCC_ENABLE_LIBCXX)
+    if(RCC_COMPILER_IS_GCC_COMPATIBLE)
+      check_cxx_compiler_flag("-stdlib=libc++" CXX_COMPILER_SUPPORTS_STDLIB)
+      check_linker_flag(CXX "-stdlib=libc++" CXX_LINKER_SUPPORTS_STDLIB)
+      if(CXX_COMPILER_SUPPORTS_STDLIB AND CXX_LINKER_SUPPORTS_STDLIB)
+        append("-stdlib=libc++"
+          CMAKE_CXX_FLAGS CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS
+          CMAKE_MODULE_LINKER_FLAGS)
+        set(RCC_LIBCXX_USED 1)
+      else()
+        message(WARNING "Can't specify libc++ with '-stdlib='")
+      endif()
+    else()
+      message(WARNING "Not sure how to specify libc++ for this compiler")
+    endif()
+  endif()
+
+  if(RCC_STATIC_LINK_CXX_STDLIB)
+    if(RCC_COMPILER_IS_GCC_COMPATIBLE)
+      check_cxx_compiler_flag("-static-libstdc++"
+                              CXX_COMPILER_SUPPORTS_STATIC_STDLIB)
+      check_linker_flag(CXX "-static-libstdc++" CXX_LINKER_SUPPORTS_STATIC_STDLIB)
+      if(CXX_COMPILER_SUPPORTS_STATIC_STDLIB AND
+        CXX_LINKER_SUPPORTS_STATIC_STDLIB)
+        append("-static-libstdc++"
+          CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS
+          CMAKE_MODULE_LINKER_FLAGS)
+      else()
+        message(WARNING
+          "Can't specify static linking for the C++ standard library")
+      endif()
+    else()
+      message(WARNING "Not sure how to specify static linking of C++ standard "
+        "library for this compiler")
+    endif()
+  endif()
+endif()