A working grub cannot be built with upcoming binutils and gcc, because linker relaxation was added [1] causing new unsupported relocations to appear in modules.
So we pass -mno-relax to gcc if it is supported, to disable relaxation and make grub forward-compatible with new toolchains. While similar code already exists for sparc64 in configure.ac, sparc64 sets LDFLAGS while loongarch requires CFLAGS to be set. If we only set LDFLAGS on loongarch, gcc will still generate relaxation relocations in the .o files, so the sparc64 code cannot be reused. [1]: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=56576f4a722b7398d35802ecf7d4185c27d6d69b Signed-off-by: Xiaotian Wu <wuxiaot...@loongson.cn> --- configure.ac | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/configure.ac b/configure.ac index d9f088d12..a0ea5beae 100644 --- a/configure.ac +++ b/configure.ac @@ -874,6 +874,29 @@ if test "x$target_cpu" = xloongarch64; then TARGET_CFLAGS="$TARGET_CFLAGS -mno-explicit-relocs -fno-plt" TARGET_CCASFLAGS="$TARGET_CCASFLAGS -mno-explicit-relocs -fno-plt" fi + + AC_CACHE_CHECK([for no-relax options], grub_cv_target_cc_mno_relax, [ + grub_cv_target_cc_mno_relax=no + for cand in "-mno-relax" "-Wa,-mno-relax"; do + if test x"$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 $grub_cv_target_cc_mno_relax" + fi + TARGET_CFLAGS="$TARGET_CFLAGS -Wa,-mla-global-with-abs" TARGET_CCASFLAGS="$TARGET_CCASFLAGS -Wa,-mla-global-with-abs" fi -- 2.40.1 _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
