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Use a search list to find a compatible toolchain #521

Merged
merged 2 commits into from
Jun 29, 2020
Merged

Use a search list to find a compatible toolchain #521

merged 2 commits into from
Jun 29, 2020

Commits on Jun 27, 2020

  1. cross-compile: add find_working_gnu_prefix to detect compiler 

    Add `find_working_gnu_prefix()` to iterate through a slice of potential
compiler prefixes, and return the first one that succeeds.

This is useful when there is not yet a single clear toolchain prefix,
for example with riscv (riscv64-unknown-none-elf vs
riscv32-unknown-none-elf vs riscv-none-embed).

Signed-off-by: Sean Cross <sean@xobs.io>
    @xobs
    xobs committed Jun 27, 2020
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  2. cross-compile: riscv: look through whitelist of compilers 

    riscv currently has several competing compiler toolchain prefixes. If a
toolchain supports multilib, then an "incorrect" target triple may be
used.

For example, many distributions ship multilib toolchains with a
`riscv64` prefix, so a riscv32imac-unknown-none-elf target can
successfully use a toolchain with a triple of `riscv64-unknown-none`.

Signed-off-by: Sean Cross <sean@xobs.io>
    @xobs
    xobs committed Jun 27, 2020
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