I think those flags disable only runtime libraries, not the code generation
Le 30 juin 2015 20:29, "Andrei Borzenkov" <arvidj...@gmail.com> a écrit :
> В Tue, 30 Jun 2015 15:05:46 -0300
> Paulo Flabiano Smorigo <pfsmor...@linux.vnet.ibm.com> пишет:
>
> > On 2015-06-30 11:33, Vladimir 'phcoder' Serbinenko wrote:
> > > What about clang?
> >
> > Not good news about clang support. This is what the toolchain team said
> > about it:
> >
> > The -mbig-endian option was added around April 10th, 2014.
> > Unfortunately, those who implemented it only implemented it for ARM and
> > one other architecture.
> >
> > The option is currently accepted on Power systems, but does not have any
> > affect on the code generation for Power.
> >
> >
> > So, what can we do here? Maybe add a constrain in the configure file
> > saying that it's not possible to build GRUB in a LE environment using
> clang.
>
> If I understand it correctly, it is possible to build for big-endian
> PowerPC using
>
> clang -target=powerpc
>
> but then we depend on clang being built with BE target support; and
> e.g. openSUSE builds it with
>
> cmake -G "Ninja" \
> -DBUILD_SHARED_LIBS=OFF \
> -DCMAKE_BUILD_TYPE=Release \
> -DLLVM_ENABLE_ASSERTIONS=OFF \
> -DLLVM_TARGETS_TO_BUILD=host \
> -DCMAKE_C_FLAGS="-O0" \
> -DCMAKE_CXX_FLAGS="-O0" \
> -DLLVM_HOST_TRIPLE=%{host_triple} \
>
> so as I understand on ppc64le it does not build support for any other
> target. Actually openSUSE does not even build clang on ppc at all.
>
>
>
> > >
> > > Le 30 juin 2015 16:30, "Andrei Borzenkov" <arvidj...@gmail.com
> > > <mailto:arvidj...@gmail.com>> a écrit :
> > >
> > > On Tue, Jun 30, 2015 at 5:03 PM, Vladimir 'phcoder' Serbinenko
> > > <phco...@gmail.com <mailto:phco...@gmail.com>> wrote:
> > > > Which compilers support these flags? I'm concerned of breaking
> > > old compilers
> > > >
> > >
> > > -static and -mbig-endian are listed in gcc 2.95.3 documentation
> for PPC.
> > >
> > > > Le 30 juin 2015 14:57, "Paulo Flabiano Smorigo"
> > > > <pfsmor...@linux.vnet.ibm.com
> > > <mailto:pfsmor...@linux.vnet.ibm.com>> a écrit :
> > > >>
> > > >> libgcc dependency was removed *just* for this target because
> > > >> the distros that use ppc64el doesn't have 32-bit support on it.
> > > >>
> > > >> * configure.ac <http://configure.ac>: Add targets for
> > > powerpc64el and skip libgcc.
> > > >> * Makefile.am: Likewise.
> > > >> ---
> > > >> configure.ac <http://configure.ac> | 8 ++++++++
> > > >> 1 file changed, 8 insertions(+)
> > > >>
> > > >> diff --git a/configure.ac <http://configure.ac> b/configure.ac
> > > <http://configure.ac>
> > > >> index fd8a62e..0a79fad 100644
> > > >> --- a/configure.ac <http://configure.ac>
> > > >> +++ b/configure.ac <http://configure.ac>
> > > >> @@ -116,6 +116,7 @@ if test "x$with_platform" = x; then
> > > >> x86_64-*) platform=pc ;;
> > > >> powerpc-*) platform=ieee1275 ;;
> > > >> powerpc64-*) platform=ieee1275 ;;
> > > >> + powerpc64le-*) platform=ieee1275 ;;
> > > >> sparc64-*) platform=ieee1275 ;;
> > > >> mipsel-*) platform=loongson ;;
> > > >> mips-*) platform=arc ;;
> > > >> @@ -138,6 +139,7 @@ case "$target_cpu"-"$platform" in
> > > >> x86_64-none) ;;
> > > >> x86_64-*) target_cpu=i386 ;;
> > > >> powerpc64-ieee1275) target_cpu=powerpc ;;
> > > >> + powerpc64le-ieee1275) target_cpu=powerpc ;;
> > > >> esac
> > > >>
> > > >> # Check if the platform is supported, make final adjustments.
> > > >> @@ -601,6 +603,12 @@ if test "x$target_cpu" = xi386 && test
> > > "x$platform"
> > > >> != xemu; then
> > > >> TARGET_CFLAGS="$TARGET_CFLAGS -march=i386"
> > > >> fi
> > > >>
> > > >> +if test x$target_cpu = xpowerpc; then
> > > >> + TARGET_CFLAGS="$TARGET_CFLAGS -mbig-endian"
> > > >> + TARGET_CCASFLAGS="$TARGET_CCASFLAGS -mbig-endian"
> > > >> + TARGET_LDFLAGS="$TARGET_LDFLAGS -static -mbig-endian"
> > > >> +fi
> > > >> +
> > > >> if test "x$target_m32" = x1; then
> > > >> # Force 32-bit mode.
> > > >> TARGET_CFLAGS="$TARGET_CFLAGS -m32"
> > > >> --
> > > >> 2.1.0
> > > >>
> > > >>
> > > >> _______________________________________________
> > > >> Grub-devel mailing list
> > > >> Grub-devel@gnu.org <mailto:Grub-devel@gnu.org>
> > > >> https://lists.gnu.org/mailman/listinfo/grub-devel
> > > >
> > > >
> > > > _______________________________________________
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> > > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > >
> > >
> > > _______________________________________________
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> > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > >
> > >
> > >
> > > _______________________________________________
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> > >
> >
> >
>
>
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