* lib/mkmf.rb (try_var): should fail for functions.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,4 +1,4 @@
-Fri Dec 14 10:01:40 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Dec 14 11:54:06 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in (RUBY_CHECK_VARTYPE): check if a variable is defined
 	  and its type.
@@ -7,6 +7,8 @@ Fri Dec 14 10:01:40 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* missing/strftime.c (strftime): fix for timezone.  [ruby-dev:32536]
 
+	* lib/mkmf.rb (try_var): should fail for functions.
+
 Fri Dec 14 08:17:24 2007  Tanaka Akira  <akr@fsij.org>
 
 	* eval.c (rb_protect): restore root_jmpbuf even if proc exits by

configure.in

@@ -639,13 +639,14 @@ AC_CACHE_CHECK([for external $1], rb_cv_var_$1,
   [rb_cv_var_$1=no
   AC_TRY_COMPILE([#define _XOPEN_SOURCE 1
     $2
-    void *t;],
+    const volatile void *volatile t;],
     [t = &(&$1)[0];],
     [for t in $3; do
       AC_TRY_COMPILE([#define _XOPEN_SOURCE 1
         $2
-        extern $t $1;],
-        [void *t = &(&$1)[0];],
+        extern $t $1;
+        const volatile void *volatile t;],
+        [t = &(&$1)[0];],
         [rb_cv_var_$1=$t; break])
     done])])
 if test "[$rb_cv_var_]$1" != no; then

lib/mkmf.rb

@@ -478,7 +478,7 @@ def try_var(var, headers = nil, &b)
 #{headers}
 /*top*/
 int main() { return 0; }
-int t() { const volatile void *volatile p; p = (void *)&#{var}; return 0; }
+int t() { const volatile void *volatile p; p = &(&#{var})[0]; return 0; }
 SRC
 end