CLANG38 build fail after CC_FLAG is added in the link rule. This failure is because the CLANG38 enable the LTO through LLVMgold.so linker plugin, but the LLVMgold.so plugin cannot accept the clang -Oz CC flag as build option. After CC_FLAG is added in the link rule, the LLVMgold.so plugin reports linking error. LLVMgold.so only accept -O0 ~ -O3, and you can see it in the LLVM gold plugin source code in below:
http://llvm.org/svn/llvm-project/llvm/tags/RELEASE_380/final/tools/gold/ gold-plugin.cpp line173: if (opt[1] < '0' || opt[1] > '3') message(LDPL_FATAL, "Optimization level must be between 0 and 3"); Add -O3 in the *_CLANG38_*_DLINK2_FLAGS to override the -Oz flag in *_CLANG38_*_CC_FLAGS to pass LLVMgold.so linking. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Steven Shi <[email protected]> --- BaseTools/Conf/tools_def.template | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template index 974656c..42a3ca0 100755 --- a/BaseTools/Conf/tools_def.template +++ b/BaseTools/Conf/tools_def.template @@ -5489,7 +5489,7 @@ DEFINE CLANG38_ALL_CC_FLAGS = DEF(GCC44_ALL_CC_FLAGS) -Wno-empty-body -f DEBUG_CLANG38_IA32_CC_FLAGS = DEF(CLANG38_ALL_CC_FLAGS) -m32 -Oz -flto -march=i586 DEF(CLANG38_IA32_TARGET) -g RELEASE_CLANG38_IA32_CC_FLAGS = DEF(CLANG38_ALL_CC_FLAGS) -m32 -Oz -flto -march=i586 DEF(CLANG38_IA32_TARGET) *_CLANG38_IA32_DLINK_FLAGS = DEF(GCC5_IA32_X64_DLINK_FLAGS) -Wl,-Oz -Wl,-melf_i386 -Wl,--oformat=elf32-i386 -*_CLANG38_IA32_DLINK2_FLAGS = DEF(GCC5_IA32_DLINK2_FLAGS) +*_CLANG38_IA32_DLINK2_FLAGS = DEF(GCC5_IA32_DLINK2_FLAGS) -O3 *_CLANG38_IA32_RC_FLAGS = DEF(GCC_IA32_RC_FLAGS) *_CLANG38_IA32_OBJCOPY_FLAGS = *_CLANG38_IA32_NASM_FLAGS = -f elf32 @@ -5518,7 +5518,7 @@ RELEASE_CLANG38_IA32_CC_FLAGS = DEF(CLANG38_ALL_CC_FLAGS) -m32 -Oz -flto - DEBUG_CLANG38_X64_CC_FLAGS = DEF(CLANG38_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANG38_X64_TARGET) -g RELEASE_CLANG38_X64_CC_FLAGS = DEF(CLANG38_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANG38_X64_TARGET) *_CLANG38_X64_DLINK_FLAGS = DEF(GCC5_IA32_X64_DLINK_FLAGS) -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie -mcmodel=small -*_CLANG38_X64_DLINK2_FLAGS = DEF(GCC5_X64_DLINK2_FLAGS) +*_CLANG38_X64_DLINK2_FLAGS = DEF(GCC5_X64_DLINK2_FLAGS) -O3 *_CLANG38_X64_RC_FLAGS = DEF(GCC_X64_RC_FLAGS) *_CLANG38_X64_OBJCOPY_FLAGS = *_CLANG38_X64_NASM_FLAGS = -f elf64 -- 2.7.4 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
