Retro68/binutils/config/hwcaps.m4
2018-12-28 16:25:28 +01:00

61 lines
1.6 KiB
Plaintext

dnl
dnl Check if the assembler used supports disabling generation of hardware
dnl capabilities. This is only supported by Solaris as at the moment.
dnl
dnl Defines:
dnl HWCAP_CFLAGS='-Wa,-nH' if possible.
dnl
AC_DEFUN([GCC_CHECK_ASSEMBLER_HWCAP], [
test -z "$HWCAP_CFLAGS" && HWCAP_CFLAGS=''
# Restrict the test to Solaris, other assemblers (e.g. AIX as) have -nH
# with a different meaning.
case ${target_os} in
solaris2*)
ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wa,-nH"
AC_MSG_CHECKING([for as that supports -Wa,-nH])
AC_TRY_COMPILE([], [return 0;], [ac_hwcap_flags=yes],[ac_hwcap_flags=no])
if test "$ac_hwcap_flags" = "yes"; then
HWCAP_CFLAGS="-Wa,-nH $HWCAP_CFLAGS"
fi
AC_MSG_RESULT($ac_hwcap_flags)
CFLAGS="$ac_save_CFLAGS"
;;
esac
AC_SUBST(HWCAP_CFLAGS)
])
dnl
dnl Check if the linker used supports linker maps to clear hardware
dnl capabilities. This is only supported on Solaris at the moment.
dnl
dnl Defines:
dnl HWCAP_LDFLAGS=-mclear-hwcap if possible
dnl LD (as a side effect of testing)
dnl
AC_DEFUN([GCC_CHECK_LINKER_HWCAP], [
test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
AC_REQUIRE([AC_PROG_LD])
ac_save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LFLAGS -mclear-hwcap"
AC_MSG_CHECKING([for -mclear-hwcap])
AC_TRY_LINK([], [return 0;], [ac_hwcap_ldflags=yes],[ac_hwcap_ldflags=no])
if test "$ac_hwcap_ldflags" = "yes"; then
HWCAP_LDFLAGS="-mclear-hwcap $HWCAP_LDFLAGS"
fi
AC_MSG_RESULT($ac_hwcap_ldflags)
LDFLAGS="$ac_save_LDFLAGS"
AC_SUBST(HWCAP_LDFLAGS)
AM_CONDITIONAL(HAVE_HWCAP, test $ac_hwcap_ldflags != no)
])