diff options
Diffstat (limited to 'sysdeps/aarch64/configure.ac')
| -rw-r--r-- | sysdeps/aarch64/configure.ac | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac index 7851dd4dac..798f494740 100644 --- a/sysdeps/aarch64/configure.ac +++ b/sysdeps/aarch64/configure.ac @@ -20,3 +20,22 @@ if test $libc_cv_aarch64_be = yes; then else LIBC_CONFIG_VAR([default-abi], [lp64]) fi + +# Only consider BTI supported if -mbranch-protection=bti is +# on by default in the compiler and the linker produces +# binaries with GNU property notes in PT_GNU_PROPERTY segment. +AC_CACHE_CHECK([for BTI support], [libc_cv_aarch64_bti], [dnl + cat > conftest.c <<EOF +void foo (void) { } +EOF + libc_cv_aarch64_bti=no + if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.c]) \ + && AC_TRY_COMMAND([$READELF -lW conftest.so | grep -q GNU_PROPERTY]) \ + && AC_TRY_COMMAND([$READELF -nW conftest.so | grep -q "NT_GNU_PROPERTY_TYPE_0.*AArch64 feature:.* BTI"]) + then + libc_cv_aarch64_bti=yes + fi + rm -rf conftest.*]) +if test $libc_cv_aarch64_bti = yes; then + AC_DEFINE(HAVE_AARCH64_BTI) +fi |