Sorry I've let this go so long. I've been hoping to do some research into the issue but so far I haven't found the time. IIRC, the decision to use -Aa was made in order to more easily implement conforming C++ libc headers (i.e., the <cstdio> kind). There is some problematic interaction between -AA and the +nostl option we use to remove the native C++ standard library include directory (include_std/) from the preprocessor search path. There may have been other reasons that I don't recall. I think it would make sense to use -AA and the compiler's own C++ libc headers provided they conform, but switching will require some effort. Can you please create an issue for this project?
Thanks Martin Andrew Black wrote:
Greetings Martin, all. I've been looking at the acc.config file, and I'm curious as to the reason we're using the -AA switch with aCC 5 and 6 (HPUX on IA64), but using the -Aa switch for aCC 3 (HPUX on PARISC). The reason I'm curious is because my understanding is that most libraries are built using -AA, such as those provided by many database vendors. In addition, libraries built with -Aa are binary incompatible with those built with -AA. (As background for those unfamiliar with the compiler, the -AA and -Aa switches enable recent ANSI C++ features like Koenig lookup, but differ in the include paths and versions of libCsup used.) --Andrew Black
