How to get a crosscompile toolchain for aarch64 for use in poudriere[?]

[Meyer, Wolfgang]

> Hello,
>
>
> To make the long story short, after comparing the verbose output of my
> compiling in the jails with that of a direct crosscompile I found out that it was
> able to correctly link some object files when providing absolute paths to the
> crt*.o files and correct library search path for the libgcc_something libraries.
> Which of course doesn't help when the linker is implicitly called by the
> compiler. Further research showed that I could crosscompile/link when
> providing the --sysroot=/ flag to overwrite the sysroot configuration from the
> build of the crosscompiler. Amending the lines
>
> CFLAGS+=--sysroot=/
> CPPFLAGS+=--sysroot=/  (Don't know if needed)
> CXXFLAGS+=--sysroot=/
> LDFLAGS+=--sysroot=/
>
> to my poudriere make.conf file I finally was able to produce a working cross-
> compiled package for aarch64 in poudriere. And the gains are quite significant
> (around 21 minutes for building pkg package with qemu-user emulation vs 5
> minutes using cross-compilation, native amd64 build in poudriere finishes in
> less than a minute).
>
> Still the creation of the cross-compiling toolchain seems to be quite
> cumbersome. Hence advice on getting such a toolchain in a cleaner way
> (ideally probably a working build for the xdev target) are greatly appreciated.
>


After building some more packages besides of pkg it seems, I am still not there yet. There is quite some fallout mainly during configure due to not getting the right searchpath for the libraries. Maybe creating a symlink on the root directory at the path of the expected sysroot directory might heal this.

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