diff options
author | Bruno Haible <bruno@clisp.org> | 2003-01-14 13:26:04 +0000 |
---|---|---|
committer | Bruno Haible <bruno@clisp.org> | 2009-06-23 12:08:56 +0200 |
commit | 239fa8447b9d440c74589f3b636a0dddba82d6fc (patch) | |
tree | 3764828c6095515c6011f7226aa67eb45989c85f /m4 | |
parent | c2addc093b1271e9be677b07e31db46e03569538 (diff) | |
download | external_gettext-239fa8447b9d440c74589f3b636a0dddba82d6fc.zip external_gettext-239fa8447b9d440c74589f3b636a0dddba82d6fc.tar.gz external_gettext-239fa8447b9d440c74589f3b636a0dddba82d6fc.tar.bz2 |
gnulib infrastructure.
Diffstat (limited to 'm4')
-rw-r--r-- | m4/onceonly.m4 | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/m4/onceonly.m4 b/m4/onceonly.m4 new file mode 100644 index 0000000..0a7deb1 --- /dev/null +++ b/m4/onceonly.m4 @@ -0,0 +1,58 @@ +# onceonly.m4 serial 1 +dnl Copyright (C) 2002 Free Software Foundation, Inc. +dnl This file is free software, distributed under the terms of the GNU +dnl General Public License. As a special exception to the GNU General +dnl Public License, this file may be distributed as part of a program +dnl that contains a configuration script generated by Autoconf, under +dnl the same distribution terms as the rest of that program. + +dnl This file defines some "once only" variants of standard autoconf macros. +dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS +dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS +dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS +dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC +dnl The advantage is that the check for each of the headers/functions/decls +dnl will be put only once into the 'configure' file. It keeps the size of +dnl the 'configure' file down, and avoids redundant output when 'configure' +dnl is run. +dnl The drawback is that the checks cannot be conditionalized. If you write +dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi +dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to +dnl empty, and the check will be inserted before the body of the AC_DEFUNed +dnl function. + +# AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of +# AC_CHECK_HEADERS(HEADER1 HEADER2 ...). +AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ + : + AC_FOREACH([gl_HEADER_NAME], [$1], [ + AC_DEFUN([gl_CHECK_HEADER_]translit(gl_HEADER_NAME,[./-], [___]), [ + AC_CHECK_HEADERS(gl_HEADER_NAME) + ]) + AC_REQUIRE([gl_CHECK_HEADER_]translit(gl_HEADER_NAME,[./-], [___])) + ]) +]) + +# AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of +# AC_CHECK_FUNCS(FUNC1 FUNC2 ...). +AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ + : + AC_FOREACH([gl_FUNC_NAME], [$1], [ + AC_DEFUN([gl_CHECK_FUNC_]gl_FUNC_NAME, [ + AC_CHECK_FUNCS(gl_FUNC_NAME) + ]) + AC_REQUIRE([gl_CHECK_FUNC_]gl_FUNC_NAME) + ]) +]) + +# AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of +# AC_CHECK_DECLS(DECL1, DECL2, ...). +AC_DEFUN([AC_CHECK_DECLS_ONCE], [ + : + AC_FOREACH([gl_DECL_NAME], [$1], [ + AC_DEFUN([gl_CHECK_DECL_]gl_DECL_NAME, [ + AC_CHECK_DECLS(gl_DECL_NAME) + ]) + AC_REQUIRE([gl_CHECK_DECL_]gl_DECL_NAME) + ]) +]) |