summaryrefslogtreecommitdiff
path: root/gnulib-m4/environ.m4
diff options
context:
space:
mode:
Diffstat (limited to 'gnulib-m4/environ.m4')
-rw-r--r--gnulib-m4/environ.m436
1 files changed, 36 insertions, 0 deletions
diff --git a/gnulib-m4/environ.m4 b/gnulib-m4/environ.m4
new file mode 100644
index 0000000..b17bb60
--- /dev/null
+++ b/gnulib-m4/environ.m4
@@ -0,0 +1,36 @@
+# environ.m4 serial 2
+dnl Copyright (C) 2001-2004, 2006-2009 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])
+])