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| 1 # environ.m4 serial 1 |
| 2 dnl Copyright (C) 2001-2004, 2006-2008 Free Software Foundation, Inc. |
| 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([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 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, [ |
| 25 AC_TRY_COMPILE([$1 |
| 26 extern struct { int foo; } $2;], |
| 27 [$2.foo = 1;], |
| 28 gt_cv_var=no, |
| 29 gt_cv_var=yes)]) |
| 30 AC_MSG_RESULT($gt_cv_var) |
| 31 if test $gt_cv_var = yes; then |
| 32 AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1, |
| 33 [Define if you have the declaration of $2.]) |
| 34 fi |
| 35 undefine([gt_cv_var]) |
| 36 ]) |
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