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configure: force o32 ABI on MIPS 

GRUB code expects O32 or N32. N32 is less tested than O32, so we prefer to
compile with O32. Some systems (e.g. GNU Guix) default to using newer
n64 or n32 ABI. Try to find suitable options to force o32.

For GCC this is simply -mabi=32. While clang supports this option as well,
o32 ABI is valid for MIPS target and n32/64 ABI are valid for MIPS64 target
only, so use "-target mips/mipsel -mabi=32".

Reported-By: Mark H Weaver <mhw@netris.org>
Also-By: Mark H Weaver <mhw@netris.org>
This commit is contained in:
Andrei Borzenkov 2015-10-14 00:39:15 +02:00 committed by Vladimir Serbinenko
parent a01ab69848
commit be25d92196
1 changed files with 34 additions and 0 deletions
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34
configure.ac
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@ -597,6 +597,40 @@ int main (void);
TARGET_LDFLAGS="$TARGET_LDFLAGS $grub_cv_target_cc_big_endian"
fi
# GRUB code is N32-compliant but it's experimental and we would prefer to
# avoid having too much variety when it doesn't result in any real improvement.
# Moreover N64 isn't supported.
if test "x$target_cpu" = xmips || test "x$target_cpu" = xmipsel ; then
AC_CACHE_CHECK([for options to force MIPS o32 ABI], grub_cv_target_cc_mips_o32_abi, [
grub_cv_target_cc_mips_o32_abi=no
for arg in "" "-mabi=32" "-target $target_cpu -mabi=32" ; do
if test x"$grub_cv_target_cc_mips_o32_abi" != xno ; then
break
fi
CFLAGS="$TARGET_CFLAGS $arg -Werror"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#if !defined(_ABIO32) || !defined(_MIPS_SIM) || (_MIPS_SIM != _ABIO32)
#error not o32 ABI
#endif
asm (".globl start; start:");
asm (".globl _start; _start:");
asm (".globl __start; __start:");
void __main (void);
void __main (void) {}
int main (void);
]], [[]])],
[grub_cv_target_cc_mips_o32_abi="$arg"], [])
done
])
if test x"$grub_cv_target_cc_mips_o32_abi" = xno ; then
AC_MSG_ERROR([could not force MIPS o32 ABI])
fi
TARGET_CFLAGS="$TARGET_CFLAGS $grub_cv_target_cc_mips_o32_abi"
TARGET_CCASFLAGS="$TARGET_CCASFLAGS $grub_cv_target_cc_mips_o32_abi"
fi
AC_CACHE_CHECK([for options to compile assembly], [grub_cv_cc_target_asm_compile], [
test_program=
case "x$target_cpu-$platform" in