diff options
Diffstat (limited to 'sysdeps/x86/configure.ac')
| -rw-r--r-- | sysdeps/x86/configure.ac | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/x86/configure.ac b/sysdeps/x86/configure.ac index 8f3e119..f94088f 100644 --- a/sysdeps/x86/configure.ac +++ b/sysdeps/x86/configure.ac @@ -43,3 +43,69 @@ elif test $enable_cet = permissive; then AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_permissive) fi LIBC_CONFIG_VAR([enable-cet], [$enable_cet]) + +# Check if linker supports x86 ISA level. +AC_CACHE_CHECK([for linker x86 ISA level support], + libc_cv_include_x86_isa_level, [dnl +cat > conftest1.S <<EOF +#ifdef __LP64__ +# define P2ALIGN 3 +#else +# define P2ALIGN 2 +#endif + .section ".note.gnu.property", "a" + .p2align P2ALIGN + .long 1f - 0f /* name length. */ + .long 4f - 1f /* data length. */ + /* NT_GNU_PROPERTY_TYPE_0 */ + .long 5 /* note type. */ +0: + .asciz "GNU" /* vendor name. */ +1: + .p2align P2ALIGN + /* GNU_PROPERTY_X86_ISA_1_NEEDED */ + .long 0xc0008002 /* pr_type. */ + .long 3f - 2f /* pr_datasz. */ +2: + .long 0x1 +3: + .p2align P2ALIGN +4: +EOF +cat > conftest2.S <<EOF +#ifdef __LP64__ +# define P2ALIGN 3 +#else +# define P2ALIGN 2 +#endif + .section ".note.gnu.property", "a" + .p2align P2ALIGN + .long 1f - 0f /* name length. */ + .long 4f - 1f /* data length. */ + /* NT_GNU_PROPERTY_TYPE_0 */ + .long 5 /* note type. */ +0: + .asciz "GNU" /* vendor name. */ +1: + .p2align P2ALIGN + /* GNU_PROPERTY_X86_ISA_1_NEEDED */ + .long 0xc0008002 /* pr_type. */ + .long 3f - 2f /* pr_datasz. */ +2: + .long 0x2 +3: + .p2align P2ALIGN +4: +EOF +libc_cv_include_x86_isa_level=no +if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -nostartfiles -nostdlib -r -o conftest conftest1.S conftest2.S); then + count=`LC_ALL=C $READELF -n conftest | grep NT_GNU_PROPERTY_TYPE_0 | wc -l` + if test "$count" = 1; then + libc_cv_include_x86_isa_level=yes + fi +fi +rm -f conftest*]) +if test $libc_cv_include_x86_isa_level = yes; then + AC_DEFINE(INCLUDE_X86_ISA_LEVEL) +fi +LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level]) |