mold is the latest modern linker with high speed, I want to use it to replace default ld linker when compiling our heavy c++ repository.
I use Bazel + GCC 10.2 to compile, and mold docs provide a gcc -B/mold/path solution. However I don't find a way to pass this CLI option to bazel.
I tried bazel build --linkopt=-B/usr/local/libexec/mold //src:XXX or --copt=-B/usr/local/libexec/mold, but both don't work, bazel still use old linker.
I can ensure mold has been installed on my system, because I can compile c++ helloworld program link by mold directly run g++ -B/usr/local/libexec/mold.
Peterson's answer can work in most cases, but if you are using an outdated Bazel version such as 0.2x like me, there is a bug for Bazel link stage. The bug leads to user link flags always be overwrite by Bazel default link flags.
To verify the bug, run bazel build --subcommands --linkopt=-B/any_path <your-target>, and you will see details about link stage flags.
In my case, Bazel default flag -fuse-ld=gold and -B/usr/bin always occurs after user flags, so I have to create a soft link /usr/bin/ld.gold -> /usr/local/bin/mold. This workaround works for me.
So try:
mv /usr/bin/ld.gold /usr/bin/ld.glod.backup
ln -s /usr/local/bin/mold /usr/bin/ld.gold