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unwind: use -fno-rtti -fno-exceptions -funwind-tables

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RTTI and exceptions are not needed for the unwinder, the use of C++ there is for
very specific cases, and does not require dynamic_cast nor does it use
exceptions.  This avoids unnecessary references to type information being
emitted.

llvm-svn: 228408
This commit is contained in:
Saleem Abdulrasool 2015-02-06 17:47:57 +00:00
parent 79fdb75a34
commit 123f44a2f6
2 changed files with 9 additions and 1 deletions
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2
libcxxabi/cmake/config-ix.cmake
View File

@ -5,6 +5,8 @@ include(CheckCXXCompilerFlag)
# Check compiler flags
check_c_compiler_flag(-funwind-tables LIBCXXABI_HAS_FUNWIND_TABLES)
check_cxx_compiler_flag(-fPIC LIBCXXABI_HAS_FPIC_FLAG)
check_cxx_compiler_flag(-fno-exceptions LIBCXXABI_HAS_NO_EXCEPTIONS_FLAG)
check_cxx_compiler_flag(-fno-rtti LIBCXXABI_HAS_NO_RTTI_FLAG)
check_cxx_compiler_flag(-fstrict-aliasing LIBCXXABI_HAS_FSTRICT_ALIASING_FLAG)
check_cxx_compiler_flag(-nodefaultlibs LIBCXXABI_HAS_NODEFAULTLIBS_FLAG)
check_cxx_compiler_flag(-nostdinc++ LIBCXXABI_HAS_NOSTDINCXX_FLAG)

8
libcxxabi/src/Unwind/CMakeLists.txt
View File

@ -68,6 +68,11 @@ target_link_libraries(unwind ${libraries})
append_if(LIBCXXABI_COMPILE_FLAGS LIBCXXABI_HAS_FPIC_FLAG -fPIC)
append_if(LIBCXXABI_LINK_FLAGS LIBCXXABI_HAS_NODEFAULTLIBS_FLAG -nodefaultlibs)
set(LIBUNWIND_COMPILE_FLAGS)
append_if(LIBUNWIND_COMPILE_FLAGS LIBCXXABI_HAS_NO_EXCEPTIONS_FLAG -fno-exceptions)
append_if(LIBUNWIND_COMPILE_FLAGS LIBCXXABI_HAS_NO_RTTI_FLAG -fno-rtti)
append_if(LIBUNWIND_COMPILE_FLAGS LIBCXXABI_HAS_FUNWIND_TABLES -funwind-tables)
set(LIBCXXABI_UNWINDER_NAME "unwind")
if ( APPLE )
@ -86,11 +91,12 @@ if ( APPLE )
endif()
string(REPLACE ";" " " LIBCXXABI_COMPILE_FLAGS "${LIBCXXABI_COMPILE_FLAGS}")
string(REPLACE ";" " " LIBUNWIND_COMPILE_FLAGS "${LIBUNWIND_COMPILE_FLAGS}")
string(REPLACE ";" " " LIBCXXABI_LINK_FLAGS "${LIBCXXABI_LINK_FLAGS}")
set_target_properties(unwind
PROPERTIES
COMPILE_FLAGS "${LIBCXXABI_COMPILE_FLAGS}"
COMPILE_FLAGS "${LIBCXXABI_COMPILE_FLAGS} ${LIBUNWIND_COMPILE_FLAGS}"
LINK_FLAGS "${LIBCXXABI_LINK_FLAGS}"
OUTPUT_NAME "${LIBCXXABI_UNWINDER_NAME}"
VERSION "1.0"