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Chandler CarruthandGeoff Romer
d66b2f899c
Previously, we used the FHS "prefix" concept as the basis of the install, but this makes it hard to integrate an installed toolchain with Bazel (or similar) build system where it wants the "root" of the toolchain to have some specific files (`MODULES.bazel` or `BUILD.bazel`), and cannot reference anything outside that directory tree. An easy solution is to make the `lib/carbon` directory the root of the install and never walking up from it. Then we simply have a `bin/carbon` symlink to the busybox that is useful for getting the command into the PATH, but isn't used for anything else. The FHS-constrained install paths surround a root we fully control the layout and files within. While initially motivated by trying to make a single toolchain structure that works both for installation and for Bazel, it actually makes the paths we end up using in the toolchain much simpler. We no longer have awkward `.../lib/carbon/../../lib/carbon/...` sequences in the toolchain which is cleaner and even a (trivial) efficiency gain. As I was doing this I noticed several out-of-date comments that I tried to fix, and I tried to improve some code reuse rather than re-computing paths. --------- Co-authored-by: Geoff Romer <gromer@google.com>