Today I've verified the patch for STDCXX-507 on gcc 4.2.0 and gcc 3.4.4. The patch is here: https://issues.apache.org/jira/secure/attachment/12371246/cygwin.patch
ChangeLog: STDCXX-507 * include/rw/_defs.h [__CYGWIN__ && _RWSHARED]: #define _RWSTD_EXPORT macro using __declspec (dllexport) directiive. * include/typeinfo (bad_cast): Don't declare class as _RWSTD_EXPORT. Declare as _RWSTD_EXPORT the only members, that doesn't already present in libc. (bad_typeid): Ditto. * include/exception (exception): Ditto. (bad_exception): Ditto. (set_unexpected): Ditto. (unexpected): Ditto. (set_terminate): Ditto. (terminate): Ditto. (uncaught_exception): Ditto. * include/new (bad_alloc): Ditto. * etc/config/gcc.config [CYGWIN] (SHARED_CPPFLAGS): #define _RWSHARED for shared builds. (LDSOFLAGS): turn on exporting of the all symbols (this feature is disabled by default due to using __declspec(dllexport)). (LDFLAGS): Force ".exe" executable files extension. Without using of the -export-all-symbols linker option the some examples and tests are failed to link due to "undefined reference to the [typeinfo for ...]". Where ... is std::istream, std::ostream, std::wistream, std::wostream, ... I don't know why these typeinfo's are not exported and how to explicitly export them. Also the __rw_atomic_addxx() and __rw_atomic_xcghxx() functions are not exported because they are defined in assembly file (the gcc and ld doesn't have the feature like #pragma comment (linker, "/EXPORT=...") in MSVC). So the -export-all-symbols option is needed to deal with "undefined reference" errors. The -force-exe-suffix option is not related to the issue. It's just forces, that all executable names will end's with ".exe". Farid.
