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configure: Add -mno-relax on riscv*

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Without this option compiler sometimes emits R_RISCV_ALIGN relocs.
Unlike other relocs this one requires the linker to do NOP deletions
and we can't ignore them. Just instruct compiler not to emit them.

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Vladimir Serbinenko 2025-03-27 19:32:23 +03:00 committed by Daniel Kiper
parent 1fe0948558
commit 8fef533cf6
1 changed files with 25 additions and 0 deletions
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25
configure.ac
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@ -913,6 +913,31 @@ if test "x$target_cpu" = xloongarch64; then
TARGET_CCASFLAGS="$TARGET_CCASFLAGS -Wa,-mla-global-with-abs"
fi
if test "x$target_cpu" = xriscv64 || test "x$target_cpu" = xriscv32; then
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" "-Wa,-mno-relax"; do
if test x"$grub_cv_target_cc_mno_relax" != xno ; then
break
fi
CFLAGS="$TARGET_CFLAGS $cand -Werror"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
asm (".globl start; start:");
void __main (void);
void __main (void) {}
int main (void);
]], [[]])], [grub_cv_target_cc_mno_relax="$cand"], [])
done
])
CFLAGS="$TARGET_CFLAGS"
if test x"$grub_cv_target_cc_mno_relax" != xno ; then
TARGET_CFLAGS="$TARGET_CFLAGS $grub_cv_target_cc_mno_relax"
TARGET_CCASFLAGS="$TARGET_CCASFLAGS $grub_cv_target_cc_mno_relax"
fi
fi
# GRUB doesn't use float or doubles at all. Yet some toolchains may decide
# that floats are a good fit to run instead of what's written in the code.
# Given that floating point unit is disabled (if present to begin with)