* lib/execinfo.c, lib/execinfo.in.h, m4/execinfo.m4: New files.

lib/execinfo.c

@@ -0,0 +1,3 @@
+#include <config.h>
+#define _GL_EXECINFO_INLINE _GL_EXTERN_INLINE
+#include "execinfo.h"

lib/execinfo.in.h

@@ -0,0 +1,54 @@
+/* Information about executables.
+
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#ifndef _GL_EXECINFO_H
+#define _GL_EXECINFO_H
+
+_GL_INLINE_HEADER_BEGIN
+#ifndef _GL_EXECINFO_INLINE
+# define _GL_EXECINFO_INLINE _GL_INLINE
+#endif
+
+_GL_EXECINFO_INLINE int
+backtrace (void **buffer, int size)
+{
+  (void) buffer;
+  (void) size;
+  return 0;
+}
+
+_GL_EXECINFO_INLINE char **
+backtrace_symbols (void *const *buffer, int size)
+{
+  (void) buffer;
+  (void) size;
+  return 0;
+}
+
+_GL_EXECINFO_INLINE void
+backtrace_symbols_fd (void *const *buffer, int size, int fd)
+{
+  (void) buffer;
+  (void) size;
+  (void) fd;
+}
+
+_GL_INLINE_HEADER_END
+
+#endif

m4/execinfo.m4

@@ -0,0 +1,31 @@
+# Check for GNU-style execinfo.h.
+
+dnl Copyright 2012 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.
+
+AC_DEFUN([gl_EXECINFO_H],
+[
+  AC_CHECK_HEADERS_ONCE([execinfo.h])
+
+  LIB_EXECINFO=''
+  EXECINFO_H='execinfo.h'
+
+  if test $ac_cv_header_execinfo_h = yes; then
+    gl_saved_libs=$LIBS
+      AC_SEARCH_LIBS([backtrace_symbols_fd], [execinfo],
+        [test "$ac_cv_search_backtrace_symbols_fd" = "none required" ||
+         LIB_EXECINFO=$ac_cv_search_backtrace_symbols_fd])
+    LIBS=$gl_saved_libs
+    test "$ac_cv_search_backtrace_symbols_fd" = no || EXECINFO_H=''
+  fi
+
+  if test -n "$EXECINFO_H"; then
+    AC_LIBOBJ([execinfo])
+  fi
+
+  AC_SUBST([EXECINFO_H])
+  AC_SUBST([LIB_EXECINFO])
+  AM_CONDITIONAL([GL_GENERATE_EXECINFO_H], [test -n "$EXECINFO_H"])
+])