Re: [edk2-devel] [PATCH] BaseTools/tools_def.txt: Add -march=x86-64 for X64 CLANG and GCC targets

["Pedro Falcato" <pedro.falcato@gmail.com>]

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GCC 5.4 documentation (
https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gcc/x86-Options.html#x86-Options)
doesn't include x86-64. I assume that specific option was added somewhere
in the last 2-3 years when this x86-64-v* concept was added?

I went looking around in linux and they don't seem to specify anything of
sorts either.

I can't speak for ARM but for IA32 it's pretty logic: the Pentium 1 (i586)
was the first processor with CPUID, RDTSC, RD/WRMSR, etc. Essentials for
firmware code that will never really even run on a processor that old.

On Thu, Jun 30, 2022 at 12:25 AM dann frazier <dann.frazier@canonical.com>
wrote:

> On Wed, Jun 29, 2022 at 11:06:01PM +0100, Pedro Falcato wrote:
> > This may be a strong opinion but I would consider toolchains that
> > explicitly change the default -march from the well understood x86-64
> (which
> > all 64-bit processors support) to be totally broken. If a distro wants to
> > switch the -march for the packages, override CFLAGS :)
>
> Opinion noted. But is there a downside to edk2 being explicit about
> its target CPU level on x86-64, given it already does so for IA32 and
> ARM?
>
>   -dann
>
> > On Wed, Jun 29, 2022 at 10:57 PM dann frazier <
> dann.frazier@canonical.com>
> > wrote:
> >
> > > Ping on this. Would it be more palatable if I limited the change only
> > > to tested toolchains (gcc/clang)? Alternatively, is there a way to
> > > submit this code to CI to verify the !(gcc|clang) variants?
> > >
> > >   -dann
> > >
> > > On Fri, Jun 10, 2022 at 12:09:18PM -0600, dann frazier wrote:
> > > > From: dann frazier <dann.frazier@canonical.com>
> > > >
> > > > Some Linux distributions are experimenting with builds that target a
> > > > higher x86-64 psABI, such as x86-64-v3. To avoid inheriting these
> > > > compiler defaults in edk2 builds, and therefore breaking
> compatibility
> > > > with machines using older CPUs, explicitly target the generic x86-64
> > > > psABI. This is similar to how we explicitly specify the cpu type for
> > > > some other architectures (-march=i586 for IA32, -march=armv7-a for
> ARM).
> > > >
> > > > Spot tested with OVMF builds using GCC5 and CLANG38.
> > > >
> > > > Signed-off-by: dann frazier <dann.frazier@canonical.com>
> > > > ---
> > > >  BaseTools/Conf/tools_def.template | 20 ++++++++++----------
> > > >  1 file changed, 10 insertions(+), 10 deletions(-)
> > > >
> > > > diff --git a/BaseTools/Conf/tools_def.template
> > > b/BaseTools/Conf/tools_def.template
> > > > index adcd23f727..569d16fb3e 100755
> > > > --- a/BaseTools/Conf/tools_def.template
> > > > +++ b/BaseTools/Conf/tools_def.template
> > > > @@ -1885,7 +1885,7 @@ DEFINE GCC_DEPS_FLAGS              = -MMD -MF
> > > $@.deps
> > > >  DEFINE GCC48_ALL_CC_FLAGS            = DEF(GCC_ALL_CC_FLAGS)
> > > -ffunction-sections -fdata-sections
> -DSTRING_ARRAY_NAME=$(BASE_NAME)Strings
> > > >  DEFINE GCC48_IA32_X64_DLINK_COMMON   = -nostdlib
> > > -Wl,-n,-q,--gc-sections -z common-page-size=0x20
> > > >  DEFINE GCC48_IA32_CC_FLAGS           = DEF(GCC48_ALL_CC_FLAGS) -m32
> > > -march=i586 -malign-double -fno-stack-protector -D EFI32
> > > -fno-asynchronous-unwind-tables -Wno-address
> > > > -DEFINE GCC48_X64_CC_FLAGS            = DEF(GCC48_ALL_CC_FLAGS) -m64
> > > -fno-stack-protector "-DEFIAPI=__attribute__((ms_abi))"
> > > -maccumulate-outgoing-args -mno-red-zone -Wno-address -mcmodel=small
> -fpie
> > > -fno-asynchronous-unwind-tables -Wno-address
> > > > +DEFINE GCC48_X64_CC_FLAGS            = DEF(GCC48_ALL_CC_FLAGS) -m64
> > > -march=x86-64 -fno-stack-protector "-DEFIAPI=__attribute__((ms_abi))"
> > > -maccumulate-outgoing-args -mno-red-zone -Wno-address -mcmodel=small
> -fpie
> > > -fno-asynchronous-unwind-tables -Wno-address
> > > >  DEFINE GCC48_IA32_X64_ASLDLINK_FLAGS =
> DEF(GCC48_IA32_X64_DLINK_COMMON)
> > > -Wl,--entry,ReferenceAcpiTable -u ReferenceAcpiTable
> > > >  DEFINE GCC48_IA32_X64_DLINK_FLAGS    =
> DEF(GCC48_IA32_X64_DLINK_COMMON)
> > > -Wl,--entry,$(IMAGE_ENTRY_POINT) -u $(IMAGE_ENTRY_POINT)
> > > -Wl,-Map,$(DEST_DIR_DEBUG)/$(BASE_NAME).map,--whole-archive
> > > >  DEFINE GCC48_IA32_DLINK2_FLAGS       =
> > > -Wl,--defsym=PECOFF_HEADER_SIZE=0x220 DEF(GCC_DLINK2_FLAGS_COMMON)
> > > > @@ -2613,15 +2613,15 @@ NOOPT_CLANG38_IA32_DLINK2_FLAGS     =
> > > DEF(GCC5_IA32_DLINK2_FLAGS) -O0
> > > >  *_CLANG38_X64_ASLPP_FLAGS          = DEF(GCC_ASLPP_FLAGS)
> > > DEF(CLANG38_X64_TARGET)
> > > >  *_CLANG38_X64_VFRPP_FLAGS          = DEF(GCC_VFRPP_FLAGS)
> > > DEF(CLANG38_X64_TARGET)
> > > >
> > > > -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
> > > > +DEBUG_CLANG38_X64_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS) -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -fpie -Oz -flto DEF(CLANG38_X64_TARGET) -g
> > > >  DEBUG_CLANG38_X64_DLINK_FLAGS      = DEF(GCC5_IA32_X64_DLINK_FLAGS)
> > > -flto -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie
> > > -mcmodel=small
> > > >  DEBUG_CLANG38_X64_DLINK2_FLAGS     = DEF(GCC5_X64_DLINK2_FLAGS) -O3
> > > >
> > > > -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)
> > > > +RELEASE_CLANG38_X64_CC_FLAGS       = DEF(CLANG38_ALL_CC_FLAGS) -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -fpie -Oz -flto DEF(CLANG38_X64_TARGET)
> > > >  RELEASE_CLANG38_X64_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS)
> > > -flto -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie
> > > -mcmodel=small
> > > >  RELEASE_CLANG38_X64_DLINK2_FLAGS   = DEF(GCC5_X64_DLINK2_FLAGS) -O3
> > > >
> > > > -NOOPT_CLANG38_X64_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS) -m64
> > > "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie
> -O0
> > > DEF(CLANG38_X64_TARGET) -g
> > > > +NOOPT_CLANG38_X64_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS) -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -fpie -O0 DEF(CLANG38_X64_TARGET) -g
> > > >  NOOPT_CLANG38_X64_DLINK_FLAGS      = DEF(GCC5_IA32_X64_DLINK_FLAGS)
> > > -Wl,-O0 -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie
> -mcmodel=small
> > > >  NOOPT_CLANG38_X64_DLINK2_FLAGS     = DEF(GCC5_X64_DLINK2_FLAGS) -O0
> > > >
> > > > @@ -2798,17 +2798,17 @@ NOOPT_CLANGPDB_IA32_DLINK2_FLAGS     =
> > > >  *_CLANGPDB_X64_ASLPP_FLAGS          = DEF(GCC_ASLPP_FLAGS)
> > > DEF(CLANGPDB_X64_TARGET)
> > > >  *_CLANGPDB_X64_VFRPP_FLAGS          = DEF(GCC_VFRPP_FLAGS)
> > > DEF(CLANGPDB_X64_TARGET)
> > > >
> > > > -DEBUG_CLANGPDB_X64_CC_FLAGS         = DEF(CLANGPDB_ALL_CC_FLAGS)
> -m64
> > > "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -Oz
> -flto
> > > DEF(CLANGPDB_X64_TARGET) -gcodeview  -funwind-tables
> > > > +DEBUG_CLANGPDB_X64_CC_FLAGS         = DEF(CLANGPDB_ALL_CC_FLAGS)
> -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -Oz -flto DEF(CLANGPDB_X64_TARGET) -gcodeview
> > > -funwind-tables
> > > >  DEBUG_CLANGPDB_X64_DLINK_FLAGS      = /NOLOGO /NODEFAULTLIB
> > > /IGNORE:4001 /OPT:REF /OPT:ICF=10 /ALIGN:32 /FILEALIGN:32 /Machine:X64
> /DLL
> > > /ENTRY:$(IMAGE_ENTRY_POINT) /SUBSYSTEM:EFI_BOOT_SERVICE_DRIVER
> /SAFESEH:NO
> > > /BASE:0 /DEBUG:GHASH /MLLVM:-exception-model=wineh /lldmap
> > > >  DEBUG_CLANGPDB_X64_DLINK2_FLAGS     =
> > > >  DEBUG_CLANGPDB_X64_GENFW_FLAGS      = --keepexceptiontable
> > > >
> > > > -RELEASE_CLANGPDB_X64_CC_FLAGS       = DEF(CLANGPDB_ALL_CC_FLAGS)
> -m64
> > > "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -Oz
> -flto
> > > DEF(CLANGPDB_X64_TARGET) -fno-unwind-tables
> > > > +RELEASE_CLANGPDB_X64_CC_FLAGS       = DEF(CLANGPDB_ALL_CC_FLAGS)
> -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -Oz -flto DEF(CLANGPDB_X64_TARGET) -fno-unwind-tables
> > > >  RELEASE_CLANGPDB_X64_DLINK_FLAGS    = /NOLOGO /NODEFAULTLIB
> > > /IGNORE:4001 /IGNORE:4254 /OPT:REF /OPT:ICF=10 /ALIGN:32 /FILEALIGN:32
> > > /SECTION:.xdata,D /SECTION:.pdata,D /Machine:X64 /DLL
> > > /ENTRY:$(IMAGE_ENTRY_POINT) /SUBSYSTEM:EFI_BOOT_SERVICE_DRIVER
> /SAFESEH:NO
> > > /BASE:0 /MERGE:.rdata=.data /MLLVM:-exception-model=wineh /lldmap
> > > >  RELEASE_CLANGPDB_X64_DLINK2_FLAGS   =
> > > >  RELEASE_CLANGPDB_X64_GENFW_FLAGS    =
> > > >
> > > > -NOOPT_CLANGPDB_X64_CC_FLAGS         = DEF(CLANGPDB_ALL_CC_FLAGS)
> -m64
> > > "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -O0
> > > DEF(CLANGPDB_X64_TARGET) -gcodeview -funwind-tables
> > > > +NOOPT_CLANGPDB_X64_CC_FLAGS         = DEF(CLANGPDB_ALL_CC_FLAGS)
> -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -O0 DEF(CLANGPDB_X64_TARGET) -gcodeview -funwind-tables
> > > >  NOOPT_CLANGPDB_X64_DLINK_FLAGS      = /NOLOGO /NODEFAULTLIB
> > > /IGNORE:4001 /OPT:REF /OPT:ICF=10 /ALIGN:32 /FILEALIGN:32 /Machine:X64
> /DLL
> > > /ENTRY:$(IMAGE_ENTRY_POINT) /SUBSYSTEM:EFI_BOOT_SERVICE_DRIVER
> /SAFESEH:NO
> > > /BASE:0 /DEBUG:GHASH /MLLVM:-exception-model=wineh /lldmap
> > > >  NOOPT_CLANGPDB_X64_DLINK2_FLAGS     =
> > > >  NOOPT_CLANGPDB_X64_GENFW_FLAGS      = --keepexceptiontable
> > > > @@ -2901,15 +2901,15 @@ NOOPT_CLANGDWARF_IA32_DLINK2_FLAGS     =
> > > DEF(CLANGDWARF_IA32_DLINK2_FLAGS) -O0 -
> > > >  *_CLANGDWARF_X64_ASLPP_FLAGS          = DEF(GCC_ASLPP_FLAGS)
> > > DEF(CLANG38_X64_TARGET)
> > > >  *_CLANGDWARF_X64_VFRPP_FLAGS          = DEF(GCC_VFRPP_FLAGS)
> > > DEF(CLANG38_X64_TARGET)
> > > >
> > > > -DEBUG_CLANGDWARF_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
> > > > +DEBUG_CLANGDWARF_X64_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS)
> -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -fpie -Oz -flto DEF(CLANG38_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(CLANG38_ALL_CC_FLAGS)
> -m64
> > > "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie
> -Oz
> > > -flto DEF(CLANG38_X64_TARGET)
> > > > +RELEASE_CLANGDWARF_X64_CC_FLAGS       = DEF(CLANG38_ALL_CC_FLAGS)
> -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -fpie -Oz -flto DEF(CLANG38_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(CLANG38_ALL_CC_FLAGS)
> -m64
> > > "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie
> -O0
> > > DEF(CLANG38_X64_TARGET) -g
> > > > +NOOPT_CLANGDWARF_X64_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS)
> -m64
> > > -march=x86-64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone
> > > -mcmodel=small -fpie -O0 DEF(CLANG38_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
> > > >
> > >
> > >
> > > 
> > >
> > >
> > >
> >
>


-- 
Pedro Falcato

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