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      1 dnl
      2 dnl Check if the assembler used supports disabling generation of hardware
      3 dnl capabilities.  This is only supported by Solaris as at the moment.
      4 dnl
      5 dnl Defines:
      6 dnl  HWCAP_CFLAGS='-Wa,-nH' if possible.
      7 dnl
      8 AC_DEFUN([GCC_CHECK_ASSEMBLER_HWCAP], [
      9   test -z "$HWCAP_CFLAGS" && HWCAP_CFLAGS=''
     10   AC_REQUIRE([AC_CANONICAL_TARGET])
     11 
     12   # Restrict the test to Solaris, other assemblers (e.g. AIX as) have -nH
     13   # with a different meaning.
     14   case ${target_os} in
     15     solaris2*)
     16       ac_save_CFLAGS="$CFLAGS"
     17       CFLAGS="$CFLAGS -Wa,-nH"
     18 
     19       AC_MSG_CHECKING([for as that supports -Wa,-nH])
     20       AC_TRY_COMPILE([], [return 0;], [ac_hwcap_flags=yes],[ac_hwcap_flags=no])
     21       if test "$ac_hwcap_flags" = "yes"; then
     22 	HWCAP_CFLAGS="-Wa,-nH $HWCAP_CFLAGS"
     23       fi
     24       AC_MSG_RESULT($ac_hwcap_flags)
     25 
     26       CFLAGS="$ac_save_CFLAGS"
     27       ;;
     28   esac
     29 
     30   AC_SUBST(HWCAP_CFLAGS)
     31 ])
     32 
     33 
     34 dnl
     35 dnl Check if the linker used supports linker maps to clear hardware
     36 dnl capabilities.  This is only supported on Solaris at the moment.
     37 dnl
     38 dnl Defines:
     39 dnl  HWCAP_LDFLAGS=-mclear-hwcap if possible
     40 dnl  LD (as a side effect of testing)
     41 dnl
     42 AC_DEFUN([GCC_CHECK_LINKER_HWCAP], [
     43   test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
     44   AC_REQUIRE([AC_PROG_LD])
     45 
     46   ac_save_LDFLAGS="$LDFLAGS"
     47   LDFLAGS="$LFLAGS -mclear-hwcap"
     48 
     49   AC_MSG_CHECKING([for -mclear-hwcap])
     50   AC_TRY_LINK([], [return 0;], [ac_hwcap_ldflags=yes],[ac_hwcap_ldflags=no])
     51   if test "$ac_hwcap_ldflags" = "yes"; then
     52     HWCAP_LDFLAGS="-mclear-hwcap $HWCAP_LDFLAGS"
     53   fi
     54   AC_MSG_RESULT($ac_hwcap_ldflags)
     55 
     56   LDFLAGS="$ac_save_LDFLAGS"
     57 
     58   AC_SUBST(HWCAP_LDFLAGS)
     59 
     60   AM_CONDITIONAL(HAVE_HWCAP, test $ac_hwcap_ldflags != no)
     61 ])
     62