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build: use POSITION_INDEPENDENT_CODE instead of -fPIC 

Rather than hardcode the flag and check if the compiler supports it, use
the CMake property to get the right flag spelling for the compiler.
This makes it generally more portable.

llvm-svn: 314834
This commit is contained in:
Saleem Abdulrasool 2017-10-03 20:22:26 +00:00
parent 502ec49793
commit 5b93ea3b9f
2 changed files with 2 additions and 3 deletions
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1
libunwind/cmake/config-ix.cmake
View File

@ -52,7 +52,6 @@ endif ()
# Check compiler flags
check_c_compiler_flag(-funwind-tables LIBUNWIND_HAS_FUNWIND_TABLES)
check_cxx_compiler_flag(-fPIC LIBUNWIND_HAS_FPIC_FLAG)
check_cxx_compiler_flag(-fno-exceptions LIBUNWIND_HAS_NO_EXCEPTIONS_FLAG)
check_cxx_compiler_flag(-fno-rtti LIBUNWIND_HAS_NO_RTTI_FLAG)
check_cxx_compiler_flag(-fstrict-aliasing LIBUNWIND_HAS_FSTRICT_ALIASING_FLAG)

4
libunwind/src/CMakeLists.txt
View File

@ -57,7 +57,6 @@ if (LIBUNWIND_ENABLE_THREADS)
endif()
# Setup flags.
append_if(LIBUNWIND_COMPILE_FLAGS LIBUNWIND_HAS_FPIC_FLAG -fPIC)
append_if(LIBUNWIND_CXX_FLAGS LIBUNWIND_HAS_NO_RTTI_FLAG -fno-rtti)
append_if(LIBUNWIND_LINK_FLAGS LIBUNWIND_HAS_NODEFAULTLIBS_FLAG -nodefaultlibs)
@ -100,7 +99,8 @@ add_library(unwind_objects OBJECT ${LIBUNWIND_SOURCES} ${LIBUNWIND_HEADERS})
set_target_properties(unwind_objects
PROPERTIES
COMPILE_FLAGS "${LIBUNWIND_COMPILE_FLAGS}")
COMPILE_FLAGS "${LIBUNWIND_COMPILE_FLAGS}"
POSITION_INDEPENDENT_CODE ON)
set(LIBUNWIND_TARGETS)