configure.in: correctly tests dtrace -G in version 1.11

* configure.in (RUBY_DTRACE_POSTPROCESS): dtrace version SUN D 1.11
  introduces a check in the dtrace compiler to ensure that probes
  actually exist. If there are no probes, then the -G step will
  fail. As this test is only being used to determine whether -G is
  necessary (for instance, on OSX it is not), adding a real probe to
  the conftest allows it to succeed on newer versions of dtrace.
  Patch by Eric Saxby <sax AT livinginthepast.org> at
  [ruby-core:55826].  [Fix GH-351], [Bug #8606].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41815 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,14 @@
+Sun Jul  7 11:01:03 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (RUBY_DTRACE_POSTPROCESS): dtrace version SUN D 1.11
+	  introduces a check in the dtrace compiler to ensure that probes
+	  actually exist. If there are no probes, then the -G step will
+	  fail. As this test is only being used to determine whether -G is
+	  necessary (for instance, on OSX it is not), adding a real probe to
+	  the conftest allows it to succeed on newer versions of dtrace.
+	  Patch by Eric Saxby <sax AT livinginthepast.org> at
+	  [ruby-core:55826].  [Fix GH-351], [Bug #8606].
+
 Sun Jul  7 10:07:22 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bary_sq_fast): Extracted from bigsqr_fast and

configure.in

@@ -560,15 +560,19 @@ AC_DEFUN([RUBY_DTRACE_AVAILABLE],
 AC_DEFUN([RUBY_DTRACE_POSTPROCESS],
 [AC_CACHE_CHECK(whether $DTRACE needs post processing, rb_cv_prog_dtrace_g,
 [
- echo "int main(void){ return 0; }" > conftest.c
+ echo "provider conftest{ probe fire(); };" > conftest_provider.d
- echo "provider conftest{};" > conftest_provider.d
+ dtrace -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null
+ cat >conftest.c <<_CONF
+   #include "conftest_provider.h"
+   int main(void){ CONFTEST_FIRE(); return 0; }
+_CONF
  $CC $CFLAGS -c -o conftest.o conftest.c
  if $DTRACE -G -s conftest_provider.d conftest.o 2>/dev/null; then
    rb_cv_prog_dtrace_g=yes
  else
    rb_cv_prog_dtrace_g=no
  fi
- rm -f conftest.o conftest.c conftest_provider.d conftest_provider.o
+ rm -f conftest.[co] conftest_provider.[dho]
 ])
 ])