[PATCH] D23005: [CMake] Pass -nostdlib if supported

[Jonas Hahnfeld via llvm-commits]

Hahnfeld created this revision.
Hahnfeld added reviewers: fjricci, beanz, compnerd.
Hahnfeld added a subscriber: llvm-commits.

The sanitizers use C++ but don't require linking with the library.

https://reviews.llvm.org/D23005

Files:
  CMakeLists.txt
  cmake/config-ix.cmake

Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -26,6 +26,7 @@
 check_cxx_compiler_flag(-ffreestanding       COMPILER_RT_HAS_FFREESTANDING_FLAG)
 check_cxx_compiler_flag("-Werror -fno-function-sections" COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG)
 check_cxx_compiler_flag(-std=c++11           COMPILER_RT_HAS_STD_CXX11_FLAG)
+check_cxx_compiler_flag(-nostdlib            COMPILER_RT_HAS_NOSTDLIB_FLAG)
 check_cxx_compiler_flag(-ftls-model=initial-exec COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC)
 check_cxx_compiler_flag(-fno-lto             COMPILER_RT_HAS_FNO_LTO_FLAG)
 check_cxx_compiler_flag("-Werror -msse3" COMPILER_RT_HAS_MSSE3_FLAG)
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -111,6 +111,8 @@
 endif()
 
 append_string_if(COMPILER_RT_HAS_STD_CXX11_FLAG -std=c++11 CMAKE_CXX_FLAGS)
+# we don't need to link with the C++ library
+append_string_if(COMPILER_RT_HAS_NOSTDLIB_FLAG -nostdlib CMAKE_CXX_FLAGS)
 
 # Emulate C99 and C++11's __func__ for MSVC prior to 2013 CTP.
 if(NOT COMPILER_RT_HAS_FUNC_SYMBOL)


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