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Revert "libc++: Perform configuration checks with -nodefaultlibs" 

This reverts SVN r279584 which broke the buildbots.  Will re-apply once the
issue has been root-caused and fixed.

llvm-svn: 279596
This commit is contained in:
Saleem Abdulrasool 2016-08-24 00:24:05 +00:00
parent 865a98d2ed
commit 7fe0681e28
1 changed files with 2 additions and 21 deletions
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23
libcxx/cmake/config-ix.cmake
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@ -1,26 +1,5 @@
include(CheckLibraryExists)
include(CheckCXXCompilerFlag)
check_library_exists(c fopen "" LIBCXX_HAS_C_LIB)
check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXX_HAS_GCC_S_LIB)
# libc++ is built with -nodefaultlibs, so we want all our checks to also
# use this option, otherwise we may end up with an inconsistency between
# the flags we think we require during configuration (if the checks are
# performed without -nodefaultlibs) and the flags that are actually
# required during compilation (which has the -nodefaultlibs). libc is
# required for the link to go through.
check_cxx_compiler_flag(-nodefaultlibs LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
if (LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
list(APPEND CMAKE_REQUIRED_LIBRARIES -nodefaultlibs)
if (LIBCXX_HAS_C_LIB)
list(APPEND CMAKE_REQUIRED_LIBRARIES c)
endif ()
if (LIBCXX_HAS_GCC_S_LIB)
list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
endif ()
endif ()
include(CheckLibcxxAtomic)
# Check compiler flags
@ -35,5 +14,7 @@ check_cxx_compiler_flag(/GR- LIBCXX_HAS_NO_GR_FLAG)
# Check libraries
check_library_exists(pthread pthread_create "" LIBCXX_HAS_PTHREAD_LIB)
check_library_exists(c fopen "" LIBCXX_HAS_C_LIB)
check_library_exists(m ccos "" LIBCXX_HAS_M_LIB)
check_library_exists(rt clock_gettime "" LIBCXX_HAS_RT_LIB)
check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXX_HAS_GCC_S_LIB)