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111
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1 dnl
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2 dnl Check if the assembler used supports disabling generation of hardware
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3 dnl capabilities. This is only supported by Solaris as at the moment.
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4 dnl
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5 dnl Defines:
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6 dnl HWCAP_CFLAGS='-Wa,-nH' if possible.
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7 dnl
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8 AC_DEFUN([GCC_CHECK_ASSEMBLER_HWCAP], [
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9 test -z "$HWCAP_CFLAGS" && HWCAP_CFLAGS=''
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10
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11 # Restrict the test to Solaris, other assemblers (e.g. AIX as) have -nH
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12 # with a different meaning.
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13 case ${target_os} in
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14 solaris2*)
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15 ac_save_CFLAGS="$CFLAGS"
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16 CFLAGS="$CFLAGS -Wa,-nH"
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17
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18 AC_MSG_CHECKING([for as that supports -Wa,-nH])
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19 AC_TRY_COMPILE([], [return 0;], [ac_hwcap_flags=yes],[ac_hwcap_flags=no])
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20 if test "$ac_hwcap_flags" = "yes"; then
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21 HWCAP_CFLAGS="-Wa,-nH $HWCAP_CFLAGS"
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22 fi
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23 AC_MSG_RESULT($ac_hwcap_flags)
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24
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25 CFLAGS="$ac_save_CFLAGS"
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26 ;;
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27 esac
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28
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29 AC_SUBST(HWCAP_CFLAGS)
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30 ])
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31
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32
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33 dnl
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34 dnl Check if the linker used supports linker maps to clear hardware
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35 dnl capabilities. This is only supported on Solaris at the moment.
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36 dnl
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37 dnl Defines:
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38 dnl HWCAP_LDFLAGS=-mclear-hwcap if possible
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39 dnl LD (as a side effect of testing)
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40 dnl
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41 AC_DEFUN([GCC_CHECK_LINKER_HWCAP], [
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42 test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
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43 AC_REQUIRE([AC_PROG_LD])
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44
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45 ac_save_LDFLAGS="$LDFLAGS"
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46 LDFLAGS="$LFLAGS -mclear-hwcap"
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47
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48 AC_MSG_CHECKING([for -mclear-hwcap])
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49 AC_TRY_LINK([], [return 0;], [ac_hwcap_ldflags=yes],[ac_hwcap_ldflags=no])
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50 if test "$ac_hwcap_ldflags" = "yes"; then
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51 HWCAP_LDFLAGS="-mclear-hwcap $HWCAP_LDFLAGS"
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52 fi
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53 AC_MSG_RESULT($ac_hwcap_ldflags)
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54
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55 LDFLAGS="$ac_save_LDFLAGS"
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56
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57 AC_SUBST(HWCAP_LDFLAGS)
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58
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59 AM_CONDITIONAL(HAVE_HWCAP, test $ac_hwcap_ldflags != no)
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60 ])
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