* configure.in: use AC_TRY_LINK instead of AC_TRY_COMPILE.

On Solaris it can compile with signbit but can't link.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27381 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat Apr 17 23:21:15 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in: use AC_TRY_LINK instead of AC_TRY_COMPILE.
+	  On Solaris it can compile with signbit but can't link.
+
 Sat Apr 17 20:34:09 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* test/ruby/envutil.rb: update Gem::ConfigMap to fake environment for

configure.in

@@ -1119,7 +1119,7 @@ AC_REPLACE_FUNCS(dup2 memmove strerror\
 		 isnan finite isinf hypot acosh erf tgamma lgamma_r cbrt \
                  strlcpy strlcat)
 AC_CACHE_CHECK(for signbit, rb_cv_have_signbit,
-  [AC_TRY_COMPILE([
+  [AC_TRY_LINK([
 #include <math.h>
 ], [int v = signbit(-0.0);],
 	rb_cv_have_signbit=yes,