Imported Upstream version 0.63.0

[hcoop/debian/courier-authlib.git] / libltdl / m4 / argz.m4

diff --git a/libltdl/m4/argz.m4 b/libltdl/m4/argz.m4
new file mode 100644 (file)
index 0000000..37c1b11
--- /dev/null
+++ b/libltdl/m4/argz.m4
@@ -0,0 +1,79 @@
+# Portability macros for glibc argz.                    -*- Autoconf -*-
+#
+#   Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+#   Written by Gary V. Vaughan <gary@gnu.org>
+#
+# This file is free software; the Free Software Foundation gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+
+# serial 5 argz.m4
+
+AC_DEFUN([gl_FUNC_ARGZ],
+[gl_PREREQ_ARGZ
+
+AC_CHECK_HEADERS([argz.h], [], [], [AC_INCLUDES_DEFAULT])
+
+AC_CHECK_TYPES([error_t],
+  [],
+  [AC_DEFINE([error_t], [int],
+   [Define to a type to use for `error_t' if it is not otherwise available.])
+   AC_DEFINE([__error_t_defined], [1], [Define so that glibc/gnulib argp.h
+    does not typedef error_t.])],
+  [#if defined(HAVE_ARGZ_H)
+#  include <argz.h>
+#endif])
+
+ARGZ_H=
+AC_CHECK_FUNCS([argz_add argz_append argz_count argz_create_sep argz_insert \
+       argz_next argz_stringify], [], [ARGZ_H=argz.h; AC_LIBOBJ([argz])])
+
+dnl if have system argz functions, allow forced use of
+dnl libltdl-supplied implementation (and default to do so
+dnl on "known bad" systems). Could use a runtime check, but
+dnl (a) detecting malloc issues is notoriously unreliable
+dnl (b) only known system that declares argz functions,
+dnl     provides them, yet they are broken, is cygwin
+dnl     releases prior to 16-Mar-2007 (1.5.24 and earlier)
+dnl So, it's more straightforward simply to special case
+dnl this for known bad systems.
+AS_IF([test -z "$ARGZ_H"],
+    [AC_CACHE_CHECK(
+        [if argz actually works],
+        [lt_cv_sys_argz_works],
+        [[case $host_os in #(
+        *cygwin*)
+          lt_cv_sys_argz_works=no
+          if test "$cross_compiling" != no; then
+            lt_cv_sys_argz_works="guessing no"
+          else
+            lt_sed_extract_leading_digits='s/^\([0-9\.]*\).*/\1/'
+            save_IFS=$IFS
+            IFS=-.
+            set x `uname -r | sed -e "$lt_sed_extract_leading_digits"`
+            IFS=$save_IFS
+            lt_os_major=${2-0}
+            lt_os_minor=${3-0}
+            lt_os_micro=${4-0}
+            if test "$lt_os_major" -gt 1 \
+               || { test "$lt_os_major" -eq 1 \
+                 && { test "$lt_os_minor" -gt 5 \
+                   || { test "$lt_os_minor" -eq 5 \
+                     && test "$lt_os_micro" -gt 24; }; }; }; then
+              lt_cv_sys_argz_works=yes
+            fi
+          fi
+          ;; #(
+        *) lt_cv_sys_argz_works=yes ;;
+        esac]])
+     AS_IF([test $lt_cv_sys_argz_works = yes],
+        [AC_DEFINE([HAVE_WORKING_ARGZ], 1,
+                   [This value is set to 1 to indicate that the system argz facility works])],
+        [ARGZ_H=argz.h
+        AC_LIBOBJ([argz])])])
+
+AC_SUBST([ARGZ_H])
+])
+
+# Prerequisites of lib/argz.c.
+AC_DEFUN([gl_PREREQ_ARGZ], [:])