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Support arm clang 3.8 amd later.

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clang 3.8 and later doesn't support -mllvm -use-arm-movt=0
whereas older clang doesn't know -mno-movt. So use
-mno-movt whenever possible and fallback to mllvm variant.
This commit is contained in:
Vladimir Serbinenko 2017-01-28 14:41:23 +00:00
parent a0413e2677
commit d15f17b2a0
1 changed files with 15 additions and 7 deletions
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22
configure.ac
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@ -1152,15 +1152,23 @@ if test "$target_cpu"-"$platform" = x86_64-efi; then
fi
if test "x$target_cpu" = xarm; then
AC_CACHE_CHECK([whether option -mllvm -arm-use-movt=0 works], grub_cv_cc_mllvm_arm_use_movt, [
CPPFLAGS="$TARGET_CPPFLAGS -mllvm -arm-use-movt=0 -Werror"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_cc_mllvm_arm_use_movt=yes],
[grub_cv_cc_mllvm_arm_use_movt=no])
AC_CACHE_CHECK([for options to disable movt and movw], grub_cv_target_cc_mno_movt, [
grub_cv_target_cc_mno_movt=no
for cand in "-mno-movt" \
"-mllvm -arm-use-movt=0"; do
if test x"$grub_cv_target_cc_mno_movt" != xno ; then
break
fi
CFLAGS="$TARGET_CFLAGS $cand -Werror"
CPPFLAGS="$TARGET_CPPFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_target_cc_mno_movt="$cand"], [])
done
])
if test "x$grub_cv_cc_mllvm_arm_use_movt" = xyes; then
if test x"$grub_cv_target_cc_mno_movt" != xno ; then
# A trick so that clang doesn't see it on link stage
TARGET_CPPFLAGS="$TARGET_CPPFLAGS -mllvm -arm-use-movt=0"
TARGET_CPPFLAGS="$TARGET_CPPFLAGS $grub_cv_target_cc_mno_movt"
fi
AC_CACHE_CHECK([whether option -mthumb-interwork works], grub_cv_cc_mthumb_interwork, [
CFLAGS="$TARGET_CFLAGS -mthumb-interwork -Werror"