Dear Nick, Many thanks for your response! Nick Bowler (2021/01/20 10:36 -0500): > One thing that might help you is to know that you can just add > cross_compiling=yes to the configure command line to force > configure into cross compilation mode. I didn't know that indeed! thanks! > If you only need the C compiler to produce code for the target system > (and never for the host system) then this might even be sufficient for > your use case. That's something I don't know for sure yet but will definitely investigate, thanks! I'm not sure but I got the impression that Autoconf has an implicit invariant which is that if build=A, host=B and target=C, then it expects that CC points to a compiler running on A aand producing code for B and if you change CC to something else, generating code for C, say, then things start to not work properly. I was suggested to run configure twice, once in the way I mentionned originally and once ==host set to my target system, so make it easier to have the target-specific information autodetected. > Unfortunately Autoconf does not directly support detection of multiple > C compilers (e.g., to get a different compiler for each of the build, > host and target systems). I think the Autoconf Archive has something > to get a compiler for the build system which might be adaptable for > target as well. Yes, indeed, I have found ax_cc_for_build: https://www.gnu.org/software/autoconf-archive/ax_cc_for_build.html#ax_cc_for_build and also ax_prog_cc_for_build: https://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html At the conceptual level, it feels that my use case does not really fit in what has been imagined by autoconf. Indeed, since build=host, we are not really cross-compiling, as defined by autoconf. But still, since host!=target, what we are building is a cross-comppiler. At an abstract level one may thing that a cross-compiler is just a program, but still, it feels autoconf or the configure script should take this into account that the built program has something to do with cross-compilation. Getting a bit lost here... Sébastien.
