On Tuesday 27 November 2007 11:09, you wrote: > On 27 November 2007 15:49, Stephane Hockenhull wrote: > >> But why are you using -fleading-underscore? > > > > on the win32 platform all C symbols requires a leading underscore > > Yes, that is the case on almost all platforms. > > And the compiler *automatically* puts leading underscores on symbols on > all those platforms already. > > So the question remains: why are you using -fleading-underscores? > > -fleading-underscore is intended for use on platforms that *don't* > require a leading underscore (e.g. ppc), where you might for special > reasons want to force the symbols to have an underscore anyway. > > > everything works fine until we start using std::string objects, there is > > a bug with the special case name mangling. > > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34166 > > Yes, but as you yourself explain, the symbols already have leading > underscores, and when you use -fleading-underscore, because it fails to > consistently add *extra* underscores.
no, the symbol have a first underscore because that's how G++ mangles them, it ALWAYS add 1 underscore (without -fleading-underscore) and some other characters. without -fleading-underscore for example "strstr" is called "strstr" but win32 libraries need "_strstr" so -fleading-underscore must be used with -fleading-underscore gcc/g++ adds an underscore to ALL symbols, including mangled ones, therefore it need TWO underscores for mangled names and ONE underscore for normal identifiers. which g++ does right 99.9% of the time, but it only does it halfway to std::string. it tries to call it as "__ZNSs7replaceEmmPKc" but it instanciate it as "_ZNSs7replaceEmmPKc" which is clearly a bug I just need to know where in the code this boolean option is located and where the mangling is done so I can patch it up. > So: why are you using -fleading-underscores? > > cheers, > DaveK I'm an underscorophile, underscores makes me horny, that's why I drive around town in an blue-screen-painted icecream truck playing windows's boot up sounds to attract little windows symbols with underscores and "@" signs. joking aside, we need to generate ELF object files for running on windows. -- Stephane Hockenhull SSC-Studios.com
