autotools: introduce AM_LANGINFO_CODESET

* (m4/codeset.m4) new file (from the gettext package)
* (configure.in) use AM_LANGINFO_CODESET
* (.gitignore) don't ignore m4/codeset.m4

3 files changed, 24 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 94777dd..9e91caf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *~
 /build-aux/
+!/m4/codeset.m4
 /m4/
 configure
 Makefile
diff --git a/configure.in b/configure.in
index 3c186da..aa4299f 100644
--- a/configure.in
+++ b/configure.in
@@ -152,5 +152,7 @@ dnl Checks for library functions.
 AC_CHECK_FUNCS(getline getopt getopt_long setenv setpgid setpgrp setsid)
 AC_CHECK_FUNCS(unsetenv usleep vsnprintf)
 
+AM_LANGINFO_CODESET
+
 AC_CONFIG_FILES([Makefile doc/Makefile src/Makefile contrib/Makefile])
 AC_OUTPUT
diff --git a/m4/codeset.m4 b/m4/codeset.m4
new file mode 100644
index 0000000..a53c042
--- /dev/null
+++ b/m4/codeset.m4
@@ -0,0 +1,21 @@
+# codeset.m4 serial 4 (gettext-0.18)
+dnl Copyright (C) 2000-2002, 2006, 2008-2010 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 From Bruno Haible.
+
+AC_DEFUN([AM_LANGINFO_CODESET],
+[
+  AC_CACHE_CHECK([for nl_langinfo and CODESET], [am_cv_langinfo_codeset],
+    [AC_TRY_LINK([#include <langinfo.h>],
+      [char* cs = nl_langinfo(CODESET); return !cs;],
+      [am_cv_langinfo_codeset=yes],
+      [am_cv_langinfo_codeset=no])
+    ])
+  if test $am_cv_langinfo_codeset = yes; then
+    AC_DEFINE([HAVE_LANGINFO_CODESET], [1],
+      [Define if you have <langinfo.h> and nl_langinfo(CODESET).])
+  fi
+])