Use Gnulib's `locale' module.

[bpt/guile.git] / m4 / locale_h.m4

diff --git a/m4/locale_h.m4 b/m4/locale_h.m4
new file mode 100644 (file)
index 0000000..35b8b32
--- /dev/null
+++ b/m4/locale_h.m4
@@ -0,0 +1,82 @@
+# locale_h.m4 serial 5
+dnl Copyright (C) 2007, 2009 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_LOCALE_H],
+[
+  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
+  dnl once only, before all statements that occur in other macros.
+  AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
+
+  dnl Persuade glibc <locale.h> to define locale_t.
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+  dnl If <stddef.h> is replaced, then <locale.h> must also be replaced.
+  AC_REQUIRE([gl_STDDEF_H])
+
+  AC_CACHE_CHECK([whether locale.h conforms to POSIX:2001],
+    [gl_cv_header_locale_h_posix2001],
+    [AC_TRY_COMPILE([#include <locale.h>
+int x = LC_MESSAGES;], [],
+       [gl_cv_header_locale_h_posix2001=yes],
+       [gl_cv_header_locale_h_posix2001=no])])
+
+  dnl Check for <xlocale.h>.
+  AC_CHECK_HEADERS_ONCE([xlocale.h])
+  if test $ac_cv_header_xlocale_h = yes; then
+    HAVE_XLOCALE_H=1
+    dnl Check whether use of locale_t requires inclusion of <xlocale.h>,
+    dnl e.g. on MacOS X 10.5. If <locale.h> does not define locale_t by
+    dnl itself, we assume that <xlocale.h> will do so.
+    AC_CACHE_CHECK([whether locale.h defines locale_t],
+      [gl_cv_header_locale_has_locale_t],
+      [AC_TRY_COMPILE([#include <locale.h>
+locale_t x;], [],
+         [gl_cv_header_locale_has_locale_t=yes],
+         [gl_cv_header_locale_has_locale_t=no])
+      ])
+    if test $gl_cv_header_locale_has_locale_t = yes; then
+      gl_cv_header_locale_h_needs_xlocale_h=no
+    else
+      gl_cv_header_locale_h_needs_xlocale_h=yes
+    fi
+  else
+    HAVE_XLOCALE_H=0
+    gl_cv_header_locale_h_needs_xlocale_h=no
+  fi
+  AC_SUBST([HAVE_XLOCALE_H])
+
+  dnl Execute this unconditionally, because LOCALE_H may be set by other
+  dnl modules, after this code is executed.
+  gl_CHECK_NEXT_HEADERS([locale.h])
+
+  if test -n "$STDDEF_H" \
+     || test $gl_cv_header_locale_h_posix2001 = no \
+     || test $gl_cv_header_locale_h_needs_xlocale_h = yes; then
+    gl_REPLACE_LOCALE_H
+  fi
+])
+
+dnl Unconditionally enables the replacement of <locale.h>.
+AC_DEFUN([gl_REPLACE_LOCALE_H],
+[
+  AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
+  LOCALE_H=locale.h
+])
+
+AC_DEFUN([gl_LOCALE_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
+  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+])
+
+AC_DEFUN([gl_LOCALE_H_DEFAULTS],
+[
+  GNULIB_DUPLOCALE=0;  AC_SUBST([GNULIB_DUPLOCALE])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  REPLACE_DUPLOCALE=0; AC_SUBST([REPLACE_DUPLOCALE])
+  LOCALE_H='';         AC_SUBST([LOCALE_H])
+])