2 files changed, 251 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index 8b8b88d078c..1d1d06a133f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2000-02-12  Dave Love  <fx@gnu.org>
+
+        * configure.in: Use AC_FUNC_VFORK.
+
 2000-02-01  Gerd Moellmann  <gerd@gnu.org>
 
         * make-dist: Various fixes for new development tree.
diff --git a/configure b/configure
index 216cf5ad1c3..aaf28ea5b95 100755
--- a/configure
+++ b/configure
@@ -1392,7 +1392,7 @@ case "${canonical}" in
     # so that, for instance, grepping for `free' in stdlib.h fails and
     # AC_HEADER_STD_C fails.   (MIPSPro 7.2.1.2m compilers, Irix 6.5.3m).
     NON_GNU_CPP="/lib/cpp -D_LANGUAGE_C"
-    NON_GCC_TEST_OPTIONS="-n32 -G0 -D_LANGUAGE_C"
+    NON_GCC_TEST_OPTIONS="-n32 -D_LANGUAGE_C"
   ;;
   mips-sgi-irix6* )
     machine=iris4d opsys=irix6-0
@@ -2733,7 +2733,7 @@ else
 int main() {
 
 /* Ultrix mips cc rejects this.  */
-typedef int charset[2]; const charset x;
+typedef int charset[2]; const charset x = {0,0};
 /* SunOS 4.1.1 cc rejects this.  */
 char const *const *ccp;
 char **p;
@@ -4676,7 +4676,7 @@ else
 #include "confdefs.h"
 #include <alloca.h>
 int main() {
-char *p = alloca(2 * sizeof(int));
+void *p = alloca(2 * sizeof(int));
 ; return 0; }
 EOF
 if { (eval echo configure:4683: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
@@ -6321,6 +6321,250 @@ else
   echo "$ac_t""no" 1>&6
 fi
 
+echo $ac_n "checking for pid_t""... $ac_c" 1>&6
+echo "configure:6326: checking for pid_t" >&5
+if eval "test \"`echo '$''{'ac_cv_type_pid_t'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 6331 "configure"
+#include "confdefs.h"
+#include <sys/types.h>
+#if STDC_HEADERS
+#include <stdlib.h>
+#include <stddef.h>
+#endif
+EOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  egrep "(^|[^a-zA-Z_0-9])pid_t[^a-zA-Z_0-9]" >/dev/null 2>&1; then
+  rm -rf conftest*
+  ac_cv_type_pid_t=yes
+else
+  rm -rf conftest*
+  ac_cv_type_pid_t=no
+fi
+rm -f conftest*
+
+fi
+echo "$ac_t""$ac_cv_type_pid_t" 1>&6
+if test $ac_cv_type_pid_t = no; then
+  cat >> confdefs.h <<\EOF
+#define pid_t int
+EOF
+
+fi
+
+ac_safe=`echo "vfork.h" | sed 'y%./+-%__p_%'`
+echo $ac_n "checking for vfork.h""... $ac_c" 1>&6
+echo "configure:6360: checking for vfork.h" >&5
+if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 6365 "configure"
+#include "confdefs.h"
+#include <vfork.h>
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:6370: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  rm -rf conftest*
+  eval "ac_cv_header_$ac_safe=yes"
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_header_$ac_safe=no"
+fi
+rm -f conftest*
+fi
+if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+  cat >> confdefs.h <<\EOF
+#define HAVE_VFORK_H 1
+EOF
+
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+echo $ac_n "checking for working vfork""... $ac_c" 1>&6
+echo "configure:6395: checking for working vfork" >&5
+if eval "test \"`echo '$''{'ac_cv_func_vfork_works'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test "$cross_compiling" = yes; then
+  echo $ac_n "checking for vfork""... $ac_c" 1>&6
+echo "configure:6401: checking for vfork" >&5
+if eval "test \"`echo '$''{'ac_cv_func_vfork'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 6406 "configure"
+#include "confdefs.h"
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char vfork(); below.  */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error.  */
+/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char vfork();
+
+int main() {
+
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_vfork) || defined (__stub___vfork)
+choke me
+#else
+vfork();
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:6429: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_func_vfork=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_func_vfork=no"
+fi
+rm -f conftest*
+fi
+
+if eval "test \"`echo '$ac_cv_func_'vfork`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+  :
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+ac_cv_func_vfork_works=$ac_cv_func_vfork
+else
+  cat > conftest.$ac_ext <<EOF
+#line 6451 "configure"
+#include "confdefs.h"
+/* Thanks to Paul Eggert for this test.  */
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_VFORK_H
+#include <vfork.h>
+#endif
+/* On some sparc systems, changes by the child to local and incoming
+   argument registers are propagated back to the parent.
+   The compiler is told about this with #include <vfork.h>,
+   but some compilers (e.g. gcc -O) don't grok <vfork.h>.
+   Test for this by using a static variable whose address
+   is put into a register that is clobbered by the vfork.  */
+static
+#ifdef __cplusplus
+sparc_address_test (int arg)
+#else
+sparc_address_test (arg) int arg;
+#endif
+{
+  static pid_t child;
+  if (!child) {
+    child = vfork ();
+    if (child < 0) {
+      perror ("vfork");
+      _exit(2);
+    }
+    if (!child) {
+      arg = getpid();
+      write(-1, "", 0);
+      _exit (arg);
+    }
+  }
+}
+main() {
+  pid_t parent = getpid ();
+  pid_t child;
+
+  sparc_address_test ();
+
+  child = vfork ();
+
+  if (child == 0) {
+    /* Here is another test for sparc vfork register problems.
+       This test uses lots of local variables, at least
+       as many local variables as main has allocated so far
+       including compiler temporaries.  4 locals are enough for
+       gcc 1.40.3 on a Solaris 4.1.3 sparc, but we use 8 to be safe.
+       A buggy compiler should reuse the register of parent
+       for one of the local variables, since it will think that
+       parent can't possibly be used any more in this routine.
+       Assigning to the local variable will thus munge parent
+       in the parent process.  */
+    pid_t
+      p = getpid(), p1 = getpid(), p2 = getpid(), p3 = getpid(),
+      p4 = getpid(), p5 = getpid(), p6 = getpid(), p7 = getpid();
+    /* Convince the compiler that p..p7 are live; otherwise, it might
+       use the same hardware register for all 8 local variables.  */
+    if (p != p1 || p != p2 || p != p3 || p != p4
+        || p != p5 || p != p6 || p != p7)
+      _exit(1);
+
+    /* On some systems (e.g. IRIX 3.3),
+       vfork doesn't separate parent from child file descriptors.
+       If the child closes a descriptor before it execs or exits,
+       this munges the parent's descriptor as well.
+       Test for this by closing stdout in the child.  */
+    _exit(close(fileno(stdout)) != 0);
+  } else {
+    int status;
+    struct stat st;
+
+    while (wait(&status) != child)
+      ;
+    exit(
+         /* Was there some problem with vforking?  */
+         child < 0
+
+         /* Did the child fail?  (This shouldn't happen.)  */
+         || status
+
+         /* Did the vfork/compiler bug occur?  */
+         || parent != getpid()
+
+         /* Did the file descriptor bug occur?  */
+         || fstat(fileno(stdout), &st) != 0
+         );
+  }
+}
+EOF
+if { (eval echo configure:6546: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+then
+  ac_cv_func_vfork_works=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -fr conftest*
+  ac_cv_func_vfork_works=no
+fi
+rm -fr conftest*
+fi
+
+fi
+
+echo "$ac_t""$ac_cv_func_vfork_works" 1>&6
+if test $ac_cv_func_vfork_works = no; then
+  cat >> confdefs.h <<\EOF
+#define vfork fork
+EOF
+
+fi
+
+
 # Set up the CFLAGS for real compilation, so we can substitute it.
 CFLAGS="$REAL_CFLAGS"