* lib/mkmf.rb (try_func): revert fallback checking undeclared function.

  fixed: [ruby-core:08949]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11051 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index d68eb8b060..a64729576c 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -410,13 +410,18 @@ end
 
 def try_func(func, libs, headers = nil, &b)
   headers = cpp_include(headers)
-  try_link(<<"SRC", libs, &b) or macro_defined?(func, COMMON_HEADERS+headers, &b)
+  try_link(<<"SRC", libs, &b) or try_link(<<"SRC", libs, &b)
 #{COMMON_HEADERS}
 #{headers}
 /*top*/
 int main() { return 0; }
 int t() { void ((*volatile p)()); p = (void ((*)()))#{func}; return 0; }
 SRC
+#{headers}
+/*top*/
+int main() { return 0; }
+int t() { #{func}(); return 0; }
+SRC
 end
 
 def try_var(var, headers = nil, &b)