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[CMake][libcxx] Use check_c_compiler_flag to check for nodefaultlibs 

We're using -nodefaultlibs to avoid the dependency on C++ library
when using check_cxx_compiler_flag, and as such we cannot use
check_cxx_compiler_flag to check the availability of -nodefaultlibs
itself.

llvm-svn: 299711
This commit is contained in:
Petr Hosek 2017-04-06 21:06:33 +00:00
parent b4da6840d8
commit 7dc0e3d357
1 changed files with 2 additions and 1 deletions
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3
libcxx/cmake/config-ix.cmake
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@ -1,4 +1,5 @@
include(CheckLibraryExists)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
if(WIN32 AND NOT MINGW)
@ -24,7 +25,7 @@ endif()
# required during compilation (which has the -nodefaultlibs). libc is
# required for the link to go through. We remove sanitizers from the
# configuration checks to avoid spurious link errors.
check_cxx_compiler_flag(-nodefaultlibs LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
check_c_compiler_flag(-nodefaultlibs LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
if (LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")
if (LIBCXX_HAS_C_LIB)