Hi Sébastien, On 2021-02-04, Sébastien Hinderer <Sebastien.Hinderer@xxxxxxxx> wrote: [...] > I am calling the generated configure script as follows: > > ./configure --build=x86_64-pc-linux-gnu --host=aarch64-linux-gnu > > I am getting the following output: > > checking build system type... x86_64-pc-linux-gnu > checking host system type... aarch64-unknown-linux-gnu > checking target system type... aarch64-unknown-linux-gnu > > I am okay with the first line but to absolutely not understandthe second > and third line. Why do the host and system types contain an "unknown" > string? > > Since I gave the --host=aarch64-linux-gnu arguemnt, I expected this to > be the canonical system type. And also, I thought the target system type > would default to the user-provided host system type, which does not seem > to be the case. The system type aarch64-linux-gnu is not in canonical form. A canonical system type has three parts: CPU, vendor and OS. In this case you have specified the host CPU (x86_64 / aarch64) and OS (linux-gnu), but not the host vendor. So the canonicalization process sets the vendor to "unknown" (this transformation is performed by config.sub). > Should I then rely on the host_alias and target_alias variables? It > feels odd because they may not be in canonical form and also this means > that the target will have to be explicitly given, which I thought I > don't have to do. Without knowing what your goals are, I cannot make any recommendation. Cheers, Nick
