Re: [Crash-utility] target compilation?

Jun Koi wrote: > Hi, > > I looked at configure.c, and find some code like this: > > void > get_current_configuration(void) > { > FILE *fp; > static char buf[512]; > char *p; > > #ifdef __alpha__ > target_data.target = ALPHA; > #endif > #ifdef __i386__ > target_data.target = X86; > #endif > #ifdef __powerpc__ > target_data.target = PPC; > #endif > #ifdef __ia64__ > target_data.target = IA64; > #endif > ... > } > > I have few questions: > - Is it correct that the above code want to find out the architecture > (means target here) we are compiling our code on? Exactly. > > - Who defined those architectures in the above code, like "__i386__" > (in the check "#ifdef __i386__")? I guessed that the architecture is > defined in a particular prototype file in /usr/include, but cannot > find anything there. So I think that those macros are defined by > compilation process of crash, but again I dont see anywhere in the > source doing that. I forget where they are defined, but they're available to any compiled object without any explicit #include's, like this example on my x86_64 machine: # cat tmp.c main() { #ifdef __x86_64__ printf("hello world\n"); #endif } # make tmp cc tmp.c -o tmp # ./tmp hello world # Dave