On Wed, 5 Sep 2007, Connie Sieh wrote: > On Wed, 5 Sep 2007, Glenn Horton-Smith wrote: > >> Greetings, >> >> It seems that SL4's gcc4-c++ package ("GCC version 4.1 preview") >> doesn't install gcc 4.1's include files, but instead g++4 is configured >> to use gcc3.4.3's include files ("g++4 -v" reports the >> "--with-gxx-include-dir=/usr/include/c++/3.4.3" option was used). This >> causes an enormous quantity of dire warning messages from various >> standard library classes (including <string>) when compiling almost >> anything with -O2 (such as CLHEP2 uses by default). These warnings are >> all to the effect that "dereferencing type-punned pointer will break >> strict-aliasing rules." >> >> This almost seems like it might be a mistake, and it is actually a >> problem for me, as my whole reason for trying to compare gcc4 and >> gcc3.4.3 was to try to diagnose a discrepancy we think we're seeing in >> the behavior of a Geant4 simulation compiled with gcc4 on one system vs. >> gcc3.4.3 on another. In particular, I've become somewhat suspicious of >> the type-punning in CLHEP2 because of a number of gcc bug reports of >> incorrect code being generated by gcc4.1 due to incorrect >> strict-aliasing optimizations. But with g++4 configured to use a >> standard template library that's not compatible with g++4, I don't see >> there's much point in proceeding with it as is. >> >> So, my question: is it possible to get gcc4* rpms for SL4 which >> install and use /usr/include/c++/4.1.1? (Also the corresponding version >> of libstdc++, for that matter.) If yes, it will save me some work; if >> not, I guess I'll have to install GCC4 from source if I want to make the >> comparison. > > Can you tell me the exact g++4 rpm name in question. > > rpm -qa | grep g++ rpm -qa | grep gcc4-c++ -Connie Sieh > > I will research this. > > -Connie Sieh >> >> Best regards, >> -Glenn Horton-Smith >> >