How to run the toolchain binaries use bazel run @bazel_embedded//toolchains/.....

[cbrune]

I've built a binary using bazel_embedded. It works great, thanks for all your work.

Now, however, I want to run objdump on the result to inspect it. What is the best way to invoke objdump using the same toolchain that bazel_embedded uses? Or by extension, any of the binaries from the toolchain?

I want to avoid installing any toolchain in my host environment. All the tools should come from the bazel cache.

[nathaniel-brough]

All the tools downloaded as part of gcc-arm-none are exported and available under the target;

@com_gcc_arm_none_eabi_compiler//:bin/arm-none-eabi-*

So you could put together a quick prototype to build something using objdump like so (untested);

genrule(
    name = "my_elf_symbols",
    srcs = [":my_elf"],
    outs = ["my_elf_symbols.txt"],
    cmd = "./$(location @com_gcc_arm_none_eabi_compiler//:bin/arm-none-eabi-objdump) -TC $(location :my_elf) > $@",
    tools = ["@com_gcc_arm_none_eabi_compiler//:bin/arm-none-eabi-objdump"],
)

If you are after something more sophisticated you might consider building some custom rules.

You can also run those binaries directly e.g.

bazel run @com_gcc_arm_none_eabi_compiler//:bin/arm-none-eabi-objdump -- -TC bazel-bin/path/to/elf

[cbrune]

Wonderful! Thank you. The interactive bazel run @com_gcc_arm_none_eabi_compiler//:bin/arm-none-eabi-objdump .... was what I was looking for. Thanks again.