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Annotation of embedaddon/curl/m4/curl-override.m4, revision 1.1.1.1

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 ();])])