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configure: Check linker for --image-base support

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In several scenarios, configure tests assume it's safe to use
"-Wl,-Ttext,<address>", but starting with ld.lld-21, blindly using that
flag may result in configure-test failures due to ld.lld failing to
link. The failure is because ld.lld-21 no longer allows the specified
address is less than the base address.

However, ld.lld-21+ and ld.bfd-2.44+ both provide support for the
--image-base flag making it preferable over the older -Ttext flag.

Fixes: https://savannah.gnu.org/bugs/?67662

Signed-off-by: Nicholas Vinson <nvinson234@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Nicholas Vinson 2025-11-18 19:38:07 -05:00 committed by Daniel Kiper
parent f41c896d23
commit 1a5417f39a
2 changed files with 17 additions and 2 deletions
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5
acinclude.m4
View File

@ -79,6 +79,11 @@ AC_DEFUN([grub_PROG_OBJCOPY_ABSOLUTE],
[AC_MSG_CHECKING([whether ${TARGET_OBJCOPY} works for absolute addresses])
AC_CACHE_VAL(grub_cv_prog_objcopy_absolute,
[cat > conftest.c <<\EOF
asm (
".globl start, _start, __start\n"
".ifdef cmain; .set start = _start = __start = cmain\n.endif\n"
".ifdef _cmain; .set start = _start = __start = _cmain\n.endif\n"
);
void cmain (void);
void
cmain (void)

14
configure.ac
View File

@ -1461,7 +1461,6 @@ elif test x$grub_cv_target_cc_link_format = x-mi386pe || test x$grub_cv_target_c
TARGET_IMG_LDSCRIPT='$(top_srcdir)'"/conf/i386-cygwin-img-ld.sc"
TARGET_IMG_LDFLAGS="-Wl,-T${TARGET_IMG_LDSCRIPT}"
TARGET_IMG_LDFLAGS_AC="-Wl,-T${srcdir}/conf/i386-cygwin-img-ld.sc"
TARGET_IMG_BASE_LDOPT="-Wl,-Ttext"
TARGET_IMG_CFLAGS=
else
TARGET_APPLE_LINKER=0
@ -1469,7 +1468,6 @@ else
TARGET_IMG_LDSCRIPT=
TARGET_IMG_LDFLAGS='-Wl,-N'
TARGET_IMG_LDFLAGS_AC='-Wl,-N'
TARGET_IMG_BASE_LDOPT="-Wl,-Ttext"
TARGET_IMG_CFLAGS=
fi
@ -1795,6 +1793,18 @@ LIBS=""
grub_ASM_USCORE
grub_PROG_TARGET_CC
if test "x$TARGET_APPLE_LINKER" != x1 ; then
AX_CHECK_LINK_FLAG([-Wl,--image-base,0x400000],
[TARGET_IMG_BASE_LDOPT="-Wl,--image-base"],
[TARGET_IMG_BASE_LDOPT="-Wl,-Ttext"],
[],
[AC_LANG_SOURCE([
asm (".globl start; start:");
asm (".globl _start; _start:");
asm (".globl __start; __start:");
void __main (void);
void __main (void) {}
int main (void);
])])
grub_PROG_OBJCOPY_ABSOLUTE
fi
grub_PROG_LD_BUILD_ID_NONE