> IIRC, this latter requirement is particularly important for canadian > crosses, but it applies as a general recommendation, and GNAT often > takes advantage of that to use features that will be disregarded by > stage1 (no optimization, no fatal warnings, limited runtime, etc), but > that must be available in later stages and in cross builds, which is > easy to satisfy by using the same compiler version, and which is a given > when bootstrapping. > > Of course it isn't always the case that you will run into problems when > deviating from these recommendations, so it's perfectly possible that > you get lucky building it all using compilers that don't meet the > recommendations to get started, but that's counting on luck, not on a > reliable procedure. > > See note Prerequisites in the GCC Installation manual for more details.
Right, see https://gcc.gnu.org/install/prerequisites.html (GNAT section). The only combination that is guaranteed to work is to use the same version for the native compiler to build the cross. The error reported here is one example showing why using another version will not work in general. Arno
