Hi Andrew, > There aren't any hard and fast rules because system ABIs aren't something that is determined by GCC: > they are designed by system architects. They might choose to define all manner of variants in all manner > of ways. All we in GCC can do is implement them. > So, if you want to ask a specific question about an ABI we'll try to answer it, but that's all we can do. Hmm - that sounds to me like offering detailed help for all available products but not giving information on which different products are available and how to obtain them :-). Sorry for being this obtrusive, maybe it helps if I try to boil down (parts of) my questions so that they can be answered with either yes or no (or who knows :-)): 1) Does is make a difference (w.r.t. ABI use?) if building a toolchain for i686 depending on whether I pass --target=i686-mytoolchain-linux-gnu or --target= i686-mytoolchain-linux-gnueabi to configure? 2) Does is make a difference (w.r.t. ABI use?) if building a toolchain for powerpc depending on whether I pass --target=powerpc-mytoolchain-linux-gnu or --target= powerpc-mytoolchain-linux-gnueabi to configure? 3) Again, does is make a difference (w.r.t. ABI use?) if building a toolchain for powerpc depending on whether I pass --target=powerpc-mytoolchain-linux-eabi or --target= powerpc-mytoolchain-linux-gnueabi to configure? Cheers, Chris
