gcc.dg/compat/struct-layout-1_generate.c generates some tests randomly. Not all possible combinations are tested. The test
T(2456,double a;struct{int * c;}b[];,F(2456,a,-85022.609375,131929.593750)) from PR 39903 was never generated on Linux/x86-64. As the result, PR 39903 regression wasn't detected on Linux/x86-64. -- Summary: Inadequate gcc.dg/compat/struct-layout-1_generate.c Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: testsuite AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: hjl dot tools at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39952