Ian Lance Taylor <iant@xxxxxxxxxx> writes: > info4jpk <info4jpk@xxxxxxxxxxxxxx> writes: > > Could someone please explain me the difference between the two gcc/g++ > > options "-m32" and "-arch i386"? Is there any difference when used as a > > compiler or linker flag? > > I quote the friendly manual: > > -m32 > -m64 [snip] > -march=cpu-type [snip] I think the OP was asking about m?? and *arch* (arch != march). `arch' is an apple-specific flag. I'm not sure that -m?? can be used to produce so-called `universal' or `fat' binaries, whereas it is completely valid (and somewhat common) to specify: gcc -arch i386 -arch x86_64 test.c to generate a binary which runs as x86_64 code on that architecture, but still runs correctly on x86. If you're always building for a single architecture anyway, I would bet (but do not know) that it doesn't really matter which you use. Cheers, -tom
