diff options
| author | Bob Haarman <llvm@inglorion.net> | 2017-03-22 17:25:49 +0000 |
|---|---|---|
| committer | Bob Haarman <llvm@inglorion.net> | 2017-03-22 17:25:49 +0000 |
| commit | 955475ab45db24c49adad12618dfb0a25c5e3e74 (patch) | |
| tree | cef69d0d2bec29b94ca0e1309dcec9e32c2e9963 /cmake/Modules/AddCompilerRT.cmake | |
| parent | ec69c0c9fdfcdf8a4cd5f8c00892ae58d9bb39ec (diff) | |
[compiler-rt] build compiler-rt runtimes without LTO
Summary: Currently, we build the compiler-rt runtimes with link-time optimization if LTO is configured for the LLVM project. This will break external programs that don't invoke the linker in such a way that it supports LLVM's LTO. To avoid this, this change causes the compiler-rt runtimes to be compiled with -fno-lto. This also makes the check-profile tests work on systems when doing a lld LTO build on a system where the system linker does not support LLVM LTO.
Reviewers: rnk, davidxl
Reviewed By: davidxl
Subscribers: dberris, mgorny, llvm-commits, mehdi_amini
Differential Revision: https://reviews.llvm.org/D31218
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298525 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'cmake/Modules/AddCompilerRT.cmake')
| -rw-r--r-- | cmake/Modules/AddCompilerRT.cmake | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake index d4533e631..b64eb4246 100644 --- a/cmake/Modules/AddCompilerRT.cmake +++ b/cmake/Modules/AddCompilerRT.cmake @@ -110,6 +110,13 @@ function(add_compiler_rt_runtime name type) "OS;ARCHS;SOURCES;CFLAGS;LINK_FLAGS;DEFS;LINK_LIBS;OBJECT_LIBS" ${ARGN}) set(libnames) + # Until we support this some other way, build compiler-rt runtime without LTO + # to allow non-LTO projects to link with it. + if(COMPILER_RT_HAS_FNO_LTO_FLAG) + set(NO_LTO_FLAGS "-fno-lto") + else() + set(NO_LTO_FLAGS "") + endif() if(APPLE) foreach(os ${LIB_OS}) if(type STREQUAL "STATIC") @@ -121,7 +128,7 @@ function(add_compiler_rt_runtime name type) list_intersect(LIB_ARCHS_${libname} DARWIN_${os}_ARCHS LIB_ARCHS) if(LIB_ARCHS_${libname}) list(APPEND libnames ${libname}) - set(extra_cflags_${libname} ${DARWIN_${os}_CFLAGS} ${LIB_CFLAGS}) + set(extra_cflags_${libname} ${DARWIN_${os}_CFLAGS} ${NO_LTO_FLAGS} ${LIB_CFLAGS}) set(output_name_${libname} ${libname}${COMPILER_RT_OS_SUFFIX}) set(sources_${libname} ${LIB_SOURCES}) format_object_libs(sources_${libname} ${os} ${LIB_OBJECT_LIBS}) @@ -149,7 +156,7 @@ function(add_compiler_rt_runtime name type) set(sources_${libname} ${LIB_SOURCES}) format_object_libs(sources_${libname} ${arch} ${LIB_OBJECT_LIBS}) set(libnames ${libnames} ${libname}) - set(extra_cflags_${libname} ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS}) + set(extra_cflags_${libname} ${TARGET_${arch}_CFLAGS} ${NO_LTO_FLAGS} ${LIB_CFLAGS}) endforeach() endif() |