| 1 | # onceonly.m4 serial 3 (gettext-0.12) |
|---|
| 2 | dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
|---|
| 3 | dnl This file is free software, distributed under the terms of the GNU |
|---|
| 4 | dnl General Public License. As a special exception to the GNU General |
|---|
| 5 | dnl Public License, this file may be distributed as part of a program |
|---|
| 6 | dnl that contains a configuration script generated by Autoconf, under |
|---|
| 7 | dnl the same distribution terms as the rest of that program. |
|---|
| 8 | |
|---|
| 9 | dnl This file defines some "once only" variants of standard autoconf macros. |
|---|
| 10 | dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS |
|---|
| 11 | dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS |
|---|
| 12 | dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS |
|---|
| 13 | dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC |
|---|
| 14 | dnl The advantage is that the check for each of the headers/functions/decls |
|---|
| 15 | dnl will be put only once into the 'configure' file. It keeps the size of |
|---|
| 16 | dnl the 'configure' file down, and avoids redundant output when 'configure' |
|---|
| 17 | dnl is run. |
|---|
| 18 | dnl The drawback is that the checks cannot be conditionalized. If you write |
|---|
| 19 | dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi |
|---|
| 20 | dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to |
|---|
| 21 | dnl empty, and the check will be inserted before the body of the AC_DEFUNed |
|---|
| 22 | dnl function. |
|---|
| 23 | |
|---|
| 24 | dnl Autoconf version 2.57 or newer is recommended. |
|---|
| 25 | AC_PREREQ(2.54) |
|---|
| 26 | |
|---|
| 27 | # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of |
|---|
| 28 | # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). |
|---|
| 29 | AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ |
|---|
| 30 | : |
|---|
| 31 | AC_FOREACH([gl_HEADER_NAME], [$1], [ |
|---|
| 32 | AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(m4_defn([gl_HEADER_NAME]), |
|---|
| 33 | [-./], [___])), [ |
|---|
| 34 | AC_CHECK_HEADERS(gl_HEADER_NAME) |
|---|
| 35 | ]) |
|---|
| 36 | AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, |
|---|
| 37 | [-./], [___]))) |
|---|
| 38 | ]) |
|---|
| 39 | ]) |
|---|
| 40 | |
|---|
| 41 | # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of |
|---|
| 42 | # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). |
|---|
| 43 | AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ |
|---|
| 44 | : |
|---|
| 45 | AC_FOREACH([gl_FUNC_NAME], [$1], [ |
|---|
| 46 | AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [ |
|---|
| 47 | AC_CHECK_FUNCS(m4_defn([gl_FUNC_NAME])) |
|---|
| 48 | ]) |
|---|
| 49 | AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME])) |
|---|
| 50 | ]) |
|---|
| 51 | ]) |
|---|
| 52 | |
|---|
| 53 | # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of |
|---|
| 54 | # AC_CHECK_DECLS(DECL1, DECL2, ...). |
|---|
| 55 | AC_DEFUN([AC_CHECK_DECLS_ONCE], [ |
|---|
| 56 | : |
|---|
| 57 | AC_FOREACH([gl_DECL_NAME], [$1], [ |
|---|
| 58 | AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [ |
|---|
| 59 | AC_CHECK_DECLS(m4_defn([gl_DECL_NAME])) |
|---|
| 60 | ]) |
|---|
| 61 | AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME])) |
|---|
| 62 | ]) |
|---|
| 63 | ]) |
|---|
