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Experimental support for clang for sparc64.

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Automatically discover command line options to make clang and
gcc behave in same way.

Tested with qemu.
This commit is contained in:
Vladimir Serbinenko 2015-02-22 01:53:00 +01:00
parent ebe316e4df
commit 155f334f57
3 changed files with 55 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

53
configure.ac
View file

@ -717,6 +717,55 @@ if test x"$platform" != xemu ; then
TARGET_CCASFLAGS="$TARGET_CCASFLAGS $grub_cv_target_cc_soft_float"
fi
if test x"$target_cpu" = xsparc64 ; then
AC_CACHE_CHECK([for options to reserve application registers], grub_cv_target_cc_mno_app_regs, [
grub_cv_target_cc_mno_app_regs=no
for cand in "-mllvm -sparc-reserve-app-registers" \
"-mno-app-regs"; do
if test x"$grub_cv_target_cc_mno_app_regs" != xno ; then
break
fi
CFLAGS="$TARGET_CFLAGS $cand -Werror"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_target_cc_mno_app_regs="$cand"], [])
done
])
if test x"$grub_cv_target_cc_mno_app_regs" = xno ; then
AC_MSG_ERROR([could not reserve application registers])
fi
if test x"$grub_cv_target_cc_mno_app_regs" = x"-mllvm -sparc-reserve-app-registers" ; then
# A trick so that clang doesn't see it on link stаge
TARGET_CPPFLAGS="$TARGET_CPPFLAGS $grub_cv_target_cc_mno_app_regs"
else
TARGET_CFLAGS="$TARGET_CFLAGS $grub_cv_target_cc_mno_app_regs"
fi
AC_CACHE_CHECK([for no-relax options], grub_cv_target_cc_mno_relax, [
grub_cv_target_cc_mno_relax=no
for cand in "-mno-relax" "-Wl,--no-relax"; do
if test x"$grub_cv_target_cc_mno_relax" != xno ; then
break
fi
LDFLAGS="$TARGET_LDFLAGS $cand -nostdlib -static"
CFLAGS="$TARGET_CFLAGS -Werror"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
asm (".globl start; start:");
void __main (void);
void __main (void) {}
int main (void);
]], [[]])], [grub_cv_target_cc_mno_relax="$cand"], [])
done
])
LDFLAGS="$TARGET_LDFLAGS"
CFLAGS="$TARGET_CFLAGS"
if test x"$grub_cv_target_cc_mno_relax" = xno ; then
AC_MSG_ERROR([could not find no-relax options])
fi
TARGET_LDFLAGS="$TARGET_LDFLAGS $grub_cv_target_cc_mno_relax"
fi
# By default, GCC 4.4 generates .eh_frame sections containing unwind
# information in some cases where it previously did not. GRUB doesn't need
# these and they just use up vital space. Restore the old compiler
@ -918,7 +967,7 @@ AC_SUBST(TARGET_LDFLAGS_OLDMAGIC)
LDFLAGS="$TARGET_LDFLAGS"
if test "$target_cpu" = x86_64 || test "$target_cpu-$platform" = sparc64-emu ; then
if test "$target_cpu" = x86_64 || test "$target_cpu" = sparc64 ; then
# Use large model to support 4G memory
AC_CACHE_CHECK([whether option -mcmodel=large works], grub_cv_cc_mcmodel, [
CFLAGS="$TARGET_CFLAGS -mcmodel=large"
@ -928,7 +977,7 @@ if test "$target_cpu" = x86_64 || test "$target_cpu-$platform" = sparc64-emu ; t
])
if test "x$grub_cv_cc_mcmodel" = xyes; then
TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=large"
elif test "$target_cpu-$platform" = sparc64-emu; then
elif test "$target_cpu" = sparc64; then
TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=medany"
fi
fi