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Revert "[CMake] Use __libc_start_main rather than fopen when checking for C library" 

This reverts commit r352341: it broke the build on macOS which doesn't
seem to provide __libc_start_main in its C library.

llvm-svn: 352411
This commit is contained in:
Petr Hosek 2019-01-28 19:26:41 +00:00
parent 2e35dc5185
commit 12f4b86808
5 changed files with 5 additions and 5 deletions
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2
compiler-rt/cmake/config-ix.cmake
View File

@ -12,7 +12,7 @@ function(check_linker_flag flag out_var)
cmake_pop_check_state()
endfunction()
check_library_exists(c __libc_start_main "" COMPILER_RT_HAS_LIBC)
check_library_exists(c fopen "" COMPILER_RT_HAS_LIBC)
if (COMPILER_RT_USE_BUILTINS_LIBRARY)
include(HandleCompilerRT)
find_compiler_rt_library(builtins COMPILER_RT_BUILTINS_LIBRARY)

2
libcxx/cmake/config-ix.cmake
View File

@ -7,7 +7,7 @@ if(WIN32 AND NOT MINGW)
# let the default linking take care of that.
set(LIBCXX_HAS_C_LIB NO)
else()
check_library_exists(c __libc_start_main "" LIBCXX_HAS_C_LIB)
check_library_exists(c fopen "" LIBCXX_HAS_C_LIB)
endif()
if (NOT LIBCXX_USE_COMPILER_RT)

2
libcxxabi/cmake/config-ix.cmake
View File

@ -2,7 +2,7 @@ include(CheckLibraryExists)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
check_library_exists(c __libc_start_main "" LIBCXXABI_HAS_C_LIB)
check_library_exists(c fopen "" LIBCXXABI_HAS_C_LIB)
if (NOT LIBCXXABI_USE_COMPILER_RT)
check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_S_LIB)
endif ()

2
libunwind/cmake/config-ix.cmake
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@ -3,7 +3,7 @@ include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
include(CheckLibraryExists)
check_library_exists(c __libc_start_main "" LIBUNWIND_HAS_C_LIB)
check_library_exists(c fopen "" LIBUNWIND_HAS_C_LIB)
if (NOT LIBUNWIND_USE_COMPILER_RT)
check_library_exists(gcc_s __gcc_personality_v0 "" LIBUNWIND_HAS_GCC_S_LIB)

2
llvm/runtimes/CMakeLists.txt
View File

@ -98,7 +98,7 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
include(CheckLibraryExists)
include(CheckCCompilerFlag)
check_library_exists(c __libc_start_main "" LLVM_HAS_C_LIB)
check_library_exists(c fopen "" LLVM_HAS_C_LIB)
check_c_compiler_flag(-nodefaultlibs LLVM_HAS_NODEFAULTLIBS_FLAG)
if(LLVM_HAS_NODEFAULTLIBS_FLAG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")