Re: Bug#410537: build failure on alpha

["Steve M. Robbins" <steve@sumost.ca>]

Hi Steve,

Thanks hugely for looking into this.


On Sun, Feb 25, 2007 at 10:36:21AM -0800, Steve Langasek wrote:
> On Sun, Feb 25, 2007 at 01:14:44AM -0800, Steve Langasek wrote:
> > Looking at the code, I gather that it's expected for this test to throw an
> > assertion, and the problem is that it blows up on the other end.  Other
> > tests that use CPPUNIT_ASSERT_ASSERTION_FAIL() seem to work ok, though, so
> > it doesn't seem to be a general problem with exception handling on alpha. 

Have you actually seen a test using CPPUNIT_ASSERT_ASSERTION_FAIL()
work ok?

In the buildd logs, the only tests that successfully complete
(src/cppunit/t_link, src/DllPlugInTester/DllPlugInTesterTest, and
examples/hierarchy) do *not* use CPPUNIT_ASSERT_ASSERTION_FAIL.  And
the next test, examples/cppunittest/cppunittestmain, blows up at the
first usage of CPPUNIT_ASSERT_ASSERTION_FAIL.

Just in case you were mistaken about seeing CPPUNIT_ASSERT_ASSERTION_FAIL
work correctly, I'm attaching a small test case to exercise it.  If it 
fails to work with -O2, but does work with -O0, perhaps the assembly 
might clue us in on what is being optimized away.


> > I'll dig a bit further and see what I can see.
> 
> Well, debugging this is pretty non-trivial.  I've figured out that
> parse_lsda_header() is used for "language-specific data" in the objects that
> the exception is being generated for, but half of the activity for this
> happens within libgcc, for which no debugging version is available.
> 
> I've tried rebuilding cppunit itself with different -g options (-gstabs, or
> without -g at all) to see if that would have any effect; it didn't.  Still
> bombs out at the same place.
> 
> Ah, but building with -O0 does the trick -- so there's a workaround for you
> if you'd care to go with that.

Thanks!  I'll take that if no better solution can be found.

-Steve

#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/CompilerOutputter.h>
#include <cppunit/TestResult.h>
#include <cppunit/TestResultCollector.h>
#include <cppunit/TestRunner.h>
#include <cppunit/TextTestProgressListener.h>
#include <cppunit/BriefTestProgressListener.h>
#include <cppunit/XmlOutputter.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <stdexcept>
#include <fstream>


class MyTester : public CppUnit::TestFixture
{
    CPPUNIT_TEST_SUITE( MyTester );
    CPPUNIT_TEST( myTest );
    CPPUNIT_TEST_SUITE_END();


public:
    void myTest()
    {
	CPPUNIT_ASSERT_ASSERTION_FAIL( CPPUNIT_ASSERT_EQUAL( 0, 1 ) );
    }
};


int main( int argc, char* argv[] )
{
  CPPUNIT_NS::TestResultCollector result;
  CPPUNIT_NS::BriefTestProgressListener progress;

  CPPUNIT_NS::TestResult controller;
  controller.addListener( &result );        
  controller.addListener( &progress );      

  CPPUNIT_NS::TestRunner runner;
  runner.addTest( MyTester::suite() );

  try
  {
    runner.run( controller );

    // Print test in a compiler compatible format.
    CPPUNIT_NS::CompilerOutputter outputter( &result, CPPUNIT_NS::stdCOut() );
    outputter.write(); 

  }
  catch ( std::invalid_argument &e )  // Test path not resolved
  {
    CPPUNIT_NS::stdCOut()  <<  "\n"  
                            <<  "ERROR: "  <<  e.what()
                            << "\n";
    return 0;
  }

  return result.wasSuccessful() ? 0 : 1;
}