Index: bison/src/bison/2.4.1/bison-2.4.1-src/m4/environ.m4 |
=================================================================== |
--- bison/src/bison/2.4.1/bison-2.4.1-src/m4/environ.m4 (revision 0) |
+++ bison/src/bison/2.4.1/bison-2.4.1-src/m4/environ.m4 (revision 0) |
@@ -0,0 +1,36 @@ |
+# environ.m4 serial 1 |
+dnl Copyright (C) 2001-2004, 2006-2008 Free Software Foundation, Inc. |
+dnl This file is free software; the Free Software Foundation |
+dnl gives unlimited permission to copy and/or distribute it, |
+dnl with or without modifications, as long as this notice is preserved. |
+ |
+AC_DEFUN([gl_ENVIRON], |
+[ |
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) |
+ dnl Persuade glibc <unistd.h> to declare environ. |
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
+ gt_CHECK_VAR_DECL([#include <unistd.h>], environ) |
+ if test $gt_cv_var_environ_declaration != yes; then |
+ HAVE_DECL_ENVIRON=0 |
+ fi |
+]) |
+ |
+# Check if a variable is properly declared. |
+# gt_CHECK_VAR_DECL(includes,variable) |
+AC_DEFUN([gt_CHECK_VAR_DECL], |
+[ |
+ define([gt_cv_var], [gt_cv_var_]$2[_declaration]) |
+ AC_MSG_CHECKING([if $2 is properly declared]) |
+ AC_CACHE_VAL(gt_cv_var, [ |
+ AC_TRY_COMPILE([$1 |
+ extern struct { int foo; } $2;], |
+ [$2.foo = 1;], |
+ gt_cv_var=no, |
+ gt_cv_var=yes)]) |
+ AC_MSG_RESULT($gt_cv_var) |
+ if test $gt_cv_var = yes; then |
+ AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1, |
+ [Define if you have the declaration of $2.]) |
+ fi |
+ undefine([gt_cv_var]) |
+]) |