Commit | Line | Data |
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3d99e817 | 1 | # environ.m4 serial 6 |
7a6dbc2f | 2 | dnl Copyright (C) 2001-2004, 2006-2018 Free Software Foundation, Inc. |
3d99e817 AK |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | AC_DEFUN_ONCE([gl_ENVIRON], | |
8 | [ | |
9 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
10 | dnl Persuade glibc <unistd.h> to declare environ. | |
11 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
12 | ||
13 | AC_CHECK_HEADERS_ONCE([unistd.h]) | |
14 | gt_CHECK_VAR_DECL( | |
15 | [#if HAVE_UNISTD_H | |
16 | #include <unistd.h> | |
17 | #endif | |
18 | /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>. */ | |
19 | #include <stdlib.h> | |
20 | ], | |
21 | [environ]) | |
22 | if test $gt_cv_var_environ_declaration != yes; then | |
23 | HAVE_DECL_ENVIRON=0 | |
24 | fi | |
25 | ]) | |
26 | ||
27 | # Check if a variable is properly declared. | |
28 | # gt_CHECK_VAR_DECL(includes,variable) | |
29 | AC_DEFUN([gt_CHECK_VAR_DECL], | |
30 | [ | |
31 | define([gt_cv_var], [gt_cv_var_]$2[_declaration]) | |
32 | AC_MSG_CHECKING([if $2 is properly declared]) | |
33 | AC_CACHE_VAL([gt_cv_var], [ | |
34 | AC_COMPILE_IFELSE( | |
35 | [AC_LANG_PROGRAM( | |
36 | [[$1 | |
37 | extern struct { int foo; } $2;]], | |
38 | [[$2.foo = 1;]])], | |
39 | [gt_cv_var=no], | |
40 | [gt_cv_var=yes])]) | |
41 | AC_MSG_RESULT([$gt_cv_var]) | |
42 | if test $gt_cv_var = yes; then | |
43 | AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1, | |
44 | [Define if you have the declaration of $2.]) | |
45 | fi | |
46 | undefine([gt_cv_var]) | |
47 | ]) |