Second try: checks whether right shift extends the sign bit.
Adds caching and reverts back the 'return' to 'exit()' in
AC_TRY_RUN as recommended by the Autoconf documentation.
diff --git a/configure b/configure
index 188763a..8cd4ec8 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
#! /bin/sh
-# From configure.in Revision: 1.135
+# From configure.in Revision: 1.136
# Guess values for system-dependent variables and create Makefiles.
# Generated automatically using autoconf version 2.13
@@ -5604,33 +5604,44 @@
# or fills with zeros (like the Cray J90, according to Tim Peters).
echo $ac_n "checking whether right shift extends the sign bit""... $ac_c" 1>&6
echo "configure:5607: checking whether right shift extends the sign bit" >&5
+if eval "test \"`echo '$''{'ac_cv_rshift_extends_sign'+set}'`\" = set"; then
+ echo $ac_n "(cached) $ac_c" 1>&6
+else
+
if test "$cross_compiling" = yes; then
{ echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
else
cat > conftest.$ac_ext <<EOF
-#line 5612 "configure"
+#line 5616 "configure"
#include "confdefs.h"
int main()
{
- return ((-1)>>3 == -1) ? 1 : 0;
+ exit(((-1)>>3 == -1) ? 0 : 1);
}
EOF
-if { (eval echo configure:5621: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:5625: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+then
+ ac_cv_rshift_extends_sign=yes
+else
+ echo "configure: failed program was:" >&5
+ cat conftest.$ac_ext >&5
+ rm -fr conftest*
+ ac_cv_rshift_extends_sign=no
+fi
+rm -fr conftest*
+fi
+
+fi
+
+echo "$ac_t""$ac_cv_rshift_extends_sign" 1>&6
+if test "$ac_cv_rshift_extends_sign" = no
then
cat >> confdefs.h <<\EOF
#define SIGNED_RIGHT_SHIFT_ZERO_FILLS 1
EOF
- echo "$ac_t""yes" 1>&6
-else
- echo "configure: failed program was:" >&5
- cat conftest.$ac_ext >&5
- rm -fr conftest*
- echo "$ac_t""no" 1>&6
-fi
-rm -fr conftest*
fi
@@ -5642,12 +5653,12 @@
#endif
EOF
echo $ac_n "checking for socklen_t""... $ac_c" 1>&6
-echo "configure:5646: checking for socklen_t" >&5
+echo "configure:5657: checking for socklen_t" >&5
if eval "test \"`echo '$''{'ac_cv_type_socklen_t'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
-#line 5651 "configure"
+#line 5662 "configure"
#include "confdefs.h"
#include <sys/types.h>
#if STDC_HEADERS