X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fenviron.m4;h=6c7982f9bbeeb14a0e4239ff3fd86747f4183fbf;hb=21492d6c3ca00ff0827528640804732f2ed66470;hp=5f50d6e3b02e22fbee18e10803044fac5ff89a57;hpb=b2e2010c7c902235b5efb5bd3c6529f61b093aa4;p=gnulib.git

diff --git a/m4/environ.m4 b/m4/environ.m4
index 5f50d6e3b..6c7982f9b 100644
--- a/m4/environ.m4
+++ b/m4/environ.m4
@@ -1,5 +1,5 @@
-# environ.m4 serial 3
-dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc.
+# environ.m4 serial 6
+dnl Copyright (C) 2001-2004, 2006-2011 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.
@@ -9,7 +9,16 @@ AC_DEFUN_ONCE([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)
+
+  AC_CHECK_HEADERS_ONCE([unistd.h])
+  gt_CHECK_VAR_DECL(
+    [#if HAVE_UNISTD_H
+     #include <unistd.h>
+     #endif
+     /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>.  */
+     #include <stdlib.h>
+    ],
+    [environ])
   if test $gt_cv_var_environ_declaration != yes; then
     HAVE_DECL_ENVIRON=0
   fi
@@ -22,14 +31,16 @@ 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_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM(
+         [[$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,
+    AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1,
               [Define if you have the declaration of $2.])
   fi
   undefine([gt_cv_var])