tcg-ppc64: Use getauxval for ISA detection

Glibc 2.16 includes an easy way to get feature bits previously
buried in /proc or the program startup auxiliary vector.  Use it.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/configure b/configure
index a97bf311d3..c5fa609efb 100755
--- a/configure
+++ b/configure
@@ -3308,6 +3308,20 @@ if compile_prog "" "" ; then
     int128=yes
 fi
 
+########################################
+# check if getauxval is available.
+
+getauxval=no
+cat > $TMPC << EOF
+#include <sys/auxv.h>
+int main(void) {
+  return getauxval(AT_HWCAP) == 0;
+}
+EOF
+if compile_prog "" "" ; then
+    getauxval=yes
+fi
+
 ##########################################
 # End of CC checks
 # After here, no more $cc or $ld runs
@@ -3858,6 +3872,10 @@ if test "$int128" = "yes" ; then
   echo "CONFIG_INT128=y" >> $config_host_mak
 fi
 
+if test "$getauxval" = "yes" ; then
+  echo "CONFIG_GETAUXVAL=y" >> $config_host_mak
+fi
+
 if test "$glusterfs" = "yes" ; then
   echo "CONFIG_GLUSTERFS=y" >> $config_host_mak
 fi