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[CMake][runtimes] Use -nodefaultlibs for the runtimes build 

We may not have a working C++ standard library at this point so we
shouldn't rely on it when running CMake checks.

Differential Revision: https://reviews.llvm.org/D31942

llvm-svn: 300260
This commit is contained in:
Petr Hosek 2017-04-13 21:29:03 +00:00
parent 1505ba826c
commit f571409a02
1 changed files with 19 additions and 1 deletions
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20
llvm/runtimes/CMakeLists.txt
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@ -29,7 +29,7 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
# CMake module path.
list(INSERT CMAKE_MODULE_PATH 0
"${CMAKE_CURRENT_SOURCE_DIR}/../cmake"
"${CMAKE_CURRENT_SOURCE_DIR}/../cmake/Modules"
"${CMAKE_CURRENT_SOURCE_DIR}/../cmake/modules"
"${LLVM_BINARY_DIR}/lib/cmake/llvm"
)
@ -65,10 +65,28 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
set(LLVM_ENABLE_LIBCXX ON CACHE BOOL "")
endif()
set(SAFE_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(SAFE_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
include(CheckLibraryExists)
include(CheckCCompilerFlag)
check_library_exists(c fopen "" LLVM_HAS_C_LIB)
check_c_compiler_flag(-nodefaultlibs LLVM_HAS_NODEFAULTLIBS_FLAG)
if(LLVM_HAS_NODEFAULTLIBS_FLAG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")
if(LLVM_HAS_C_LIB)
list(APPEND CMAKE_REQUIRED_LIBRARIES c)
endif()
endif()
# Handle common options used by all runtimes.
include(AddLLVM)
include(HandleLLVMOptions)
set(CMAKE_REQUIRED_FLAGS ${SAFE_CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_LIBRARIES ${SAFE_CMAKE_REQUIRED_LIBRARIES})
foreach(entry ${runtimes})
get_filename_component(projName ${entry} NAME)