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-rw-r--r--Modules/CheckCCompilerFlag.cmake20
1 files changed, 18 insertions, 2 deletions
diff --git a/Modules/CheckCCompilerFlag.cmake b/Modules/CheckCCompilerFlag.cmake
index 08e80f7..bc15e9a 100644
--- a/Modules/CheckCCompilerFlag.cmake
+++ b/Modules/CheckCCompilerFlag.cmake
@@ -2,9 +2,13 @@
# CHECK_C_COMPILER_FLAG(<flag> <var>)
# <flag> - the compiler flag
# <var> - variable to store the result
-# This internally calls the check_c_source_compiles macro.
+# This internally calls the check_c_source_compiles macro and
+# sets CMAKE_REQUIRED_DEFINITIONS to <flag>.
# See help for CheckCSourceCompiles for a listing of variables
-# that can modify the build.
+# that can otherwise modify the build.
+# The result only tells that the compiler does not give an error message when
+# it encounters the flag. If the flag has any effect or even a specific one is
+# beyond the scope of this module.
#=============================================================================
# Copyright 2006-2011 Kitware, Inc.
@@ -26,6 +30,12 @@ include(CheckCSourceCompiles)
macro (CHECK_C_COMPILER_FLAG _FLAG _RESULT)
set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
+ # Normalize locale during test compilation.
+ set(_CheckCCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
+ foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
+ set(_CheckCCompilerFlag_SAVED_${v} "$ENV{${v}}")
+ set(ENV{${v}} C)
+ endforeach()
CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${_RESULT}
# Some compilers do not fail with a bad flag
FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU
@@ -41,5 +51,11 @@ macro (CHECK_C_COMPILER_FLAG _FLAG _RESULT)
FAIL_REGEX "command option .* is not recognized" # XL
FAIL_REGEX "WARNING: unknown flag:" # Open64
)
+ foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
+ set(ENV{${v}} ${_CheckCCompilerFlag_SAVED_${v}})
+ unset(_CheckCCompilerFlag_SAVED_${v})
+ endforeach()
+ unset(_CheckCCompilerFlag_LOCALE_VARS)
+
set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
endmacro ()