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[PATCH v4 1/1] loongarch: disable relaxation relocations
From: |
Xiaotian Wu |
Subject: |
[PATCH v4 1/1] loongarch: disable relaxation relocations |
Date: |
Thu, 15 Jun 2023 09:47:21 +0800 |
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.
[1]:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=56576f4a722b7398d35802ecf7d4185c27d6d69b
Signed-off-by: Xiaotian Wu <wuxiaotian@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