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Annotation of embedaddon/curl/m4/curl-override.m4, revision 1.1

1.1     ! misho       1: #***************************************************************************
        !             2: #                                  _   _ ____  _
        !             3: #  Project                     ___| | | |  _ \| |
        !             4: #                             / __| | | | |_) | |
        !             5: #                            | (__| |_| |  _ <| |___
        !             6: #                             \___|\___/|_| \_\_____|
        !             7: #
        !             8: # Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9: #
        !            10: # This software is licensed as described in the file COPYING, which
        !            11: # you should have received as part of this distribution. The terms
        !            12: # are also available at https://curl.haxx.se/docs/copyright.html.
        !            13: #
        !            14: # You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15: # copies of the Software, and permit persons to whom the Software is
        !            16: # furnished to do so, under the terms of the COPYING file.
        !            17: #
        !            18: # This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19: # KIND, either express or implied.
        !            20: #
        !            21: ###########################################################################
        !            22: #***************************************************************************
        !            23: #***************************************************************************
        !            24: 
        !            25: # File version for 'aclocal' use. Keep it a single number.
        !            26: # serial 7
        !            27: 
        !            28: dnl CURL_OVERRIDE_AUTOCONF
        !            29: dnl -------------------------------------------------
        !            30: dnl Placing a call to this macro in configure.ac after
        !            31: dnl the one to AC_INIT will make macros in this file
        !            32: dnl visible to the rest of the compilation overriding
        !            33: dnl those from Autoconf.
        !            34: 
        !            35: AC_DEFUN([CURL_OVERRIDE_AUTOCONF], [
        !            36: AC_BEFORE([$0],[AC_PROG_LIBTOOL])
        !            37: # using curl-override.m4
        !            38: ])
        !            39: 
        !            40: dnl Override Autoconf's AC_LANG_PROGRAM (C)
        !            41: dnl -------------------------------------------------
        !            42: dnl This is done to prevent compiler warning
        !            43: dnl 'function declaration isn't a prototype'
        !            44: dnl in function main. This requires at least
        !            45: dnl a c89 compiler and does not support K&R.
        !            46: 
        !            47: m4_define([AC_LANG_PROGRAM(C)],
        !            48: [$1
        !            49: int main (void)
        !            50: {
        !            51: $2
        !            52:  ;
        !            53:  return 0;
        !            54: }])
        !            55: 
        !            56: dnl Override Autoconf's AC_LANG_CALL (C)
        !            57: dnl -------------------------------------------------
        !            58: dnl This is a backport of Autoconf's 2.60 with the
        !            59: dnl embedded comments that hit the resulting script
        !            60: dnl removed. This is done to reduce configure size
        !            61: dnl and use fixed macro across Autoconf versions.
        !            62: 
        !            63: m4_define([AC_LANG_CALL(C)],
        !            64: [AC_LANG_PROGRAM([$1
        !            65: m4_if([$2], [main], ,
        !            66: [
        !            67: #ifdef __cplusplus
        !            68: extern "C"
        !            69: #endif
        !            70: char $2 ();])], [return $2 ();])])
        !            71: 
        !            72: dnl Override Autoconf's AC_LANG_FUNC_LINK_TRY (C)
        !            73: dnl -------------------------------------------------
        !            74: dnl This is a backport of Autoconf's 2.60 with the
        !            75: dnl embedded comments that hit the resulting script
        !            76: dnl removed. This is done to reduce configure size
        !            77: dnl and use fixed macro across Autoconf versions.
        !            78: 
        !            79: m4_define([AC_LANG_FUNC_LINK_TRY(C)],
        !            80: [AC_LANG_PROGRAM(
        !            81: [
        !            82: #define $1 innocuous_$1
        !            83: #ifdef __STDC__
        !            84: # include <limits.h>
        !            85: #else
        !            86: # include <assert.h>
        !            87: #endif
        !            88: #undef $1
        !            89: #ifdef __cplusplus
        !            90: extern "C"
        !            91: #endif
        !            92: char $1 ();
        !            93: #if defined __stub_$1 || defined __stub___$1
        !            94: choke me
        !            95: #endif
        !            96: ], [return $1 ();])])