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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.
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0582df98d3
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39
configure
vendored
39
configure
vendored
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@ -1,6 +1,6 @@
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#! /bin/sh
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# From configure.in Revision: 1.135
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# From configure.in Revision: 1.136
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# Guess values for system-dependent variables and create Makefiles.
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# Generated automatically using autoconf version 2.13
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@ -5604,33 +5604,44 @@ fi
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# or fills with zeros (like the Cray J90, according to Tim Peters).
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echo $ac_n "checking whether right shift extends the sign bit""... $ac_c" 1>&6
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echo "configure:5607: checking whether right shift extends the sign bit" >&5
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if eval "test \"`echo '$''{'ac_cv_rshift_extends_sign'+set}'`\" = set"; then
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echo $ac_n "(cached) $ac_c" 1>&6
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else
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if test "$cross_compiling" = yes; then
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{ echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
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else
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cat > conftest.$ac_ext <<EOF
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#line 5612 "configure"
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#line 5616 "configure"
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#include "confdefs.h"
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int main()
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{
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return ((-1)>>3 == -1) ? 1 : 0;
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exit(((-1)>>3 == -1) ? 0 : 1);
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}
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EOF
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if { (eval echo configure:5621: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
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if { (eval echo configure:5625: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
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then
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ac_cv_rshift_extends_sign=yes
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else
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echo "configure: failed program was:" >&5
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cat conftest.$ac_ext >&5
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rm -fr conftest*
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ac_cv_rshift_extends_sign=no
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fi
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rm -fr conftest*
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fi
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fi
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echo "$ac_t""$ac_cv_rshift_extends_sign" 1>&6
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if test "$ac_cv_rshift_extends_sign" = no
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then
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cat >> confdefs.h <<\EOF
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#define SIGNED_RIGHT_SHIFT_ZERO_FILLS 1
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EOF
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echo "$ac_t""yes" 1>&6
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else
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echo "configure: failed program was:" >&5
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cat conftest.$ac_ext >&5
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rm -fr conftest*
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echo "$ac_t""no" 1>&6
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fi
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rm -fr conftest*
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fi
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@ -5642,12 +5653,12 @@ cat >> confdefs.h <<\EOF
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#endif
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EOF
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echo $ac_n "checking for socklen_t""... $ac_c" 1>&6
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echo "configure:5646: checking for socklen_t" >&5
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echo "configure:5657: checking for socklen_t" >&5
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if eval "test \"`echo '$''{'ac_cv_type_socklen_t'+set}'`\" = set"; then
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echo $ac_n "(cached) $ac_c" 1>&6
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else
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cat > conftest.$ac_ext <<EOF
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#line 5651 "configure"
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#line 5662 "configure"
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#include "confdefs.h"
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#include <sys/types.h>
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#if STDC_HEADERS
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14
configure.in
14
configure.in
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@ -1139,15 +1139,19 @@ AC_C_BIGENDIAN
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# Check whether right shifting a negative integer extends the sign bit
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# or fills with zeros (like the Cray J90, according to Tim Peters).
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AC_MSG_CHECKING(whether right shift extends the sign bit)
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AC_CACHE_VAL(ac_cv_rshift_extends_sign, [
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AC_TRY_RUN([
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int main()
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{
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return ((-1)>>3 == -1) ? 1 : 0;
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exit(((-1)>>3 == -1) ? 0 : 1);
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}
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],
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[AC_DEFINE(SIGNED_RIGHT_SHIFT_ZERO_FILLS)
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AC_MSG_RESULT(yes)],
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[AC_MSG_RESULT(no)])
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], ac_cv_rshift_extends_sign=yes, ac_cv_rshift_extends_sign=no)])
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AC_MSG_RESULT($ac_cv_rshift_extends_sign)
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if test "$ac_cv_rshift_extends_sign" = no
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then
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AC_DEFINE(SIGNED_RIGHT_SHIFT_ZERO_FILLS)
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fi
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# THIS MUST BE LAST, IT CAN BREAK OTHER TESTS!
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# Add sys/socket.h to confdefs.h
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