Hi, > > Works (test patch below for reference). > > Excellent, thanks for confirming. > > So I think we should add this for all Clang configurations that enable > PIE codegen. We don't support GCC < 5 anyway so this gives us uniform > behavior for all ELF based toolchains used for x86.
Which seems to be only X64, so the patch below should be about right (doing s/-fpie/-fpie -fdirect-access-external-data/)? take care, Gerd >From 964965d9da66235e3a29d3735ebdf6c9544b86c3 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann <kra...@redhat.com> Date: Mon, 22 May 2023 16:35:54 +0200 Subject: [PATCH 1/1] BaseTools: add -fdirect-access-external-data to clang pie builds Tell clang to not use external (via got) references for data access. Signed-off-by: Gerd Hoffmann <kra...@redhat.com> --- BaseTools/Conf/tools_def.template | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template index 503a6687c1f0..92421e3d0118 100755 --- a/BaseTools/Conf/tools_def.template +++ b/BaseTools/Conf/tools_def.template @@ -1921,15 +1921,15 @@ NOOPT_CLANGDWARF_IA32_DLINK2_FLAGS = DEF(CLANGDWARF_IA32_DLINK2_FLAGS) -O0 - *_CLANGDWARF_X64_ASLPP_FLAGS = DEF(GCC_ASLPP_FLAGS) DEF(CLANGDWARF_X64_TARGET) *_CLANGDWARF_X64_VFRPP_FLAGS = DEF(GCC_VFRPP_FLAGS) DEF(CLANGDWARF_X64_TARGET) -DEBUG_CLANGDWARF_X64_CC_FLAGS = DEF(CLANGDWARF_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANGDWARF_X64_TARGET) -g +DEBUG_CLANGDWARF_X64_CC_FLAGS = DEF(CLANGDWARF_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -fdirect-access-external-data -Oz -flto DEF(CLANGDWARF_X64_TARGET) -g DEBUG_CLANGDWARF_X64_DLINK_FLAGS = DEF(CLANGDWARF_IA32_X64_DLINK_FLAGS) -flto -Wl,-O3 -Wl,-melf_x86_64 -Wl,--oformat,elf64-x86-64 -Wl,-pie -mcmodel=small -Wl,--apply-dynamic-relocs DEBUG_CLANGDWARF_X64_DLINK2_FLAGS = DEF(CLANGDWARF_X64_DLINK2_FLAGS) -O3 -fuse-ld=lld -RELEASE_CLANGDWARF_X64_CC_FLAGS = DEF(CLANGDWARF_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANGDWARF_X64_TARGET) +RELEASE_CLANGDWARF_X64_CC_FLAGS = DEF(CLANGDWARF_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -fdirect-access-external-data -Oz -flto DEF(CLANGDWARF_X64_TARGET) RELEASE_CLANGDWARF_X64_DLINK_FLAGS = DEF(CLANGDWARF_IA32_X64_DLINK_FLAGS) -flto -Wl,-O3 -Wl,-melf_x86_64 -Wl,--oformat,elf64-x86-64 -Wl,-pie -mcmodel=small -Wl,--apply-dynamic-relocs RELEASE_CLANGDWARF_X64_DLINK2_FLAGS = DEF(CLANGDWARF_X64_DLINK2_FLAGS) -O3 -fuse-ld=lld -NOOPT_CLANGDWARF_X64_CC_FLAGS = DEF(CLANGDWARF_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -O0 DEF(CLANGDWARF_X64_TARGET) -g +NOOPT_CLANGDWARF_X64_CC_FLAGS = DEF(CLANGDWARF_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -fdirect-access-external-data -O0 DEF(CLANGDWARF_X64_TARGET) -g NOOPT_CLANGDWARF_X64_DLINK_FLAGS = DEF(CLANGDWARF_IA32_X64_DLINK_FLAGS) -Wl,-O0 -Wl,-melf_x86_64 -Wl,--oformat,elf64-x86-64 -Wl,-pie -mcmodel=small -Wl,--apply-dynamic-relocs NOOPT_CLANGDWARF_X64_DLINK2_FLAGS = DEF(CLANGDWARF_X64_DLINK2_FLAGS) -O0 -fuse-ld=lld -- 2.40.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#105165): https://edk2.groups.io/g/devel/message/105165 Mute This Topic: https://groups.io/mt/98257896/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
