1 files changed, 17 insertions, 9 deletions

diff --git a/gl/m4/regex.m4 b/gl/m4/regex.m4
index f0101fe6..49a8059f 100644
--- a/gl/m4/regex.m4
+++ b/gl/m4/regex.m4
@@ -1,9 +1,10 @@
 # regex.m4
-# serial 75
-dnl Copyright (C) 1996-2001, 2003-2024 Free Software Foundation, Inc.
+# serial 81
+dnl Copyright (C) 1996-2001, 2003-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
@@ -39,19 +40,24 @@ AC_DEFUN([gl_REGEX],
             #include <limits.h>
             #include <string.h>
 
-            #if defined M_CHECK_ACTION || HAVE_DECL_ALARM
-            # include <signal.h>
-            # include <unistd.h>
+            #if HAVE_MALLOC_H
+            # include <malloc.h> /* defines M_CHECK_ACTION on glibc */
             #endif
 
-            #if HAVE_MALLOC_H
-            # include <malloc.h>
+            #if defined __HAIKU__ || defined M_CHECK_ACTION || HAVE_DECL_ALARM
+            # include <signal.h>
+            # include <unistd.h>
             #endif
 
-            #ifdef M_CHECK_ACTION
+            #if defined __HAIKU__ || defined M_CHECK_ACTION
             /* Exit with distinguishable exit code.  */
             static void sigabrt_no_core (int sig) { raise (SIGTERM); }
             #endif
+
+            /* There is no need to check whether RE_SYNTAX_EMACS is
+               (RE_CHAR_CLASSES | RE_INTERVALS), corresponding to
+               Emacs 21 (2001) and later, because Gnulib's lib/regex.h
+               is always used and has this value.  */
           ]],
           [[int result = 0;
             static struct re_pattern_buffer regex;
@@ -67,6 +73,9 @@ AC_DEFUN([gl_REGEX],
             signal (SIGALRM, SIG_DFL);
             alarm (2);
 #endif
+#ifdef __HAIKU__
+            signal (SIGABRT, sigabrt_no_core);
+#endif
 #ifdef M_CHECK_ACTION
             signal (SIGABRT, sigabrt_no_core);
             mallopt (M_CHECK_ACTION, 2);
@@ -388,7 +397,6 @@ AC_DEFUN([gl_PREREQ_REGEX],
   AC_REQUIRE([AC_C_INLINE])
   AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([AC_TYPE_MBSTATE_T])
-  AC_REQUIRE([gl_EEMALLOC])
   AC_CHECK_HEADERS([libintl.h])
   AC_CHECK_FUNCS_ONCE([isblank iswctype])
   AC_CHECK_DECLS([isblank], [], [], [[#include <ctype.h>]])