Berkeley CSUA MOTD:Entry 45316
Berkeley CSUA MOTD
2021/10/17 [General] UID:1000 Activity:popular

2006/11/10-12 [Computer/SW/Compilers] UID:45316 Activity:nil
11/10   Is there anyway to get C/C++ compilers to automatically compile
        different code for different processors?  I'd like to be able to
        say something like:
          #if defined X86 ...
          #elif defined SPARC ...
          #else ...
        If there's not standard way to have the compiler do it, is ther an
        easy way to have configure figure it out?
        \_ Most compilers have something like that.  Which compiler are you
           \_ I have to support a couple. gcc and icc are the main ones.
           \_ So, do you know how to do it in any compiler?  Please?
        \_ Do you mean that you want to do this without the #if statements?  Or
           do you just want standardized OS defs?  If the latter, take a look a
           the wxwidgets project, it's got a lot of examples of OS-specific
           \_ I don't care about OS, I care about processor architecture.
              x86, sparc, IA64, PowerPC.  I don't really care if it's done
              with #ifdefs or some other way.  It doesn't matter.
              \_ Sorry--brain fart about OS.
         \_ gcc at least, makes this easy for you. do a 'gcc -E' and see what
            defines it sets. Usually it is thinkgs like __sparc__ and __X86__
            for the relevant architectures.  Then you can just wrap your code
             in #ifdef's for those symbols. -ERic.
2021/10/17 [General] UID:1000 Activity:popular

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