Commit | Line | Data |
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9157d901 | 1 | # environ.m4 serial 5 |
49114fd4 | 2 | dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc. |
b579617b AW |
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 | ||
4f02b98d | 7 | AC_DEFUN_ONCE([gl_ENVIRON], |
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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 | gt_CHECK_VAR_DECL([#include <unistd.h>], environ) | |
13 | if test $gt_cv_var_environ_declaration != yes; then | |
14 | HAVE_DECL_ENVIRON=0 | |
15 | fi | |
16 | ]) | |
17 | ||
18 | # Check if a variable is properly declared. | |
19 | # gt_CHECK_VAR_DECL(includes,variable) | |
20 | AC_DEFUN([gt_CHECK_VAR_DECL], | |
21 | [ | |
22 | define([gt_cv_var], [gt_cv_var_]$2[_declaration]) | |
23 | AC_MSG_CHECKING([if $2 is properly declared]) | |
24 | AC_CACHE_VAL([gt_cv_var], [ | |
9157d901 LC |
25 | AC_COMPILE_IFELSE( |
26 | [AC_LANG_PROGRAM( | |
27 | [[$1 | |
28 | extern struct { int foo; } $2;]], | |
29 | [[$2.foo = 1;]])], | |
30 | [gt_cv_var=no], | |
31 | [gt_cv_var=yes])]) | |
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32 | AC_MSG_RESULT([$gt_cv_var]) |
33 | if test $gt_cv_var = yes; then | |
9157d901 | 34 | AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1, |
b579617b AW |
35 | [Define if you have the declaration of $2.]) |
36 | fi | |
37 | undefine([gt_cv_var]) | |
38 | ]) |