The `regex' struct is both input and output.

Initialize it before each use.  Patch by Tim Waugh.

diff --git a/m4/regex.m4 b/m4/regex.m4
index d80eafb2ce5ccdbdba7fa785d5920e7522ea3182..a31ef2c0708b3e2fc4dcb49a9ce839f0c2a2b959 100644 (file)
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-#serial 13
+#serial 14
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
@@ -27,6 +27,7 @@ AC_DEFUN([jm_INCLUDED_REGEX],
                   jm_cv_func_working_re_compile_pattern,
       AC_TRY_RUN(
 [#include <stdio.h>
+#include <string.h>
 #include <regex.h>
          int
          main ()
@@ -35,12 +36,14 @@ AC_DEFUN([jm_INCLUDED_REGEX],
            const char *s;
            struct re_registers regs;
            re_set_syntax (RE_SYNTAX_POSIX_EGREP);
+           memset (&regex, 0, sizeof (regex));
            [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, &regex);]
            /* This should fail with _Invalid character class name_ error.  */
            if (!s)
              exit (1);
 
            /* This should succeed, but doesn't for e.g. glibc-2.1.3.  */
+           memset (&regex, 0, sizeof (regex));
            s = re_compile_pattern ("{1", 2, &regex);
 
            if (s)
@@ -48,6 +51,7 @@ AC_DEFUN([jm_INCLUDED_REGEX],
 
            /* The following example is derived from a problem report
                against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>.  */
+           memset (&regex, 0, sizeof (regex));
            s = re_compile_pattern ("[[anù]]*n", 7, &regex);
            if (s)
              exit (1);