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[bazel][docs] Update build documentation (#99339)

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This PR updates the Quick Start section to provide more detailed build
instructions.
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Angel Zhang 2024-07-17 14:47:53 -04:00 committed by GitHub
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34
utils/bazel/README.md
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@ -33,15 +33,31 @@ for adding this configuration.
[bazelisk](https://github.com/bazelbuild/bazelisk) which automates
downloading the proper bazel version
3. `cd utils/bazel`
4. `bazel build --config=generic_clang @llvm-project//...`
* If you're using clang, it's expected that lld is also available
* If you're using MSVC or gcc, instead of `--config=generic_clang`, pass
`--config=generic_gcc` or `--config=msvc`
* To specify a specific local compiler to use, add the following bazel
flag: `--repo_env=CC=/usr/bin/clang`
* `--config=generic_clang`/`--config=generic_gcc` by default set
`--repo_env=CC=clang`/`--repo_env=CC=gcc`, using `clang`/`gcc` on the
`PATH`
4. The `bazel build` command depends on the local compiler you want to use.
* For **clang**, go to step 5.
* For **gcc** or **MSVC**, go to step 6
5. If you are using **clang**, it is expected that lld is also available.
The `--config=generic_clang` flag by default sets the compiler to be `clang`
binary on the `PATH`.
```
bazel build --config=generic_clang @llvm-project//...
```
To provide a specific path to your `clang`, use the `--repo_env` Bazel flag.
For example:
```
bazel build --config=generic_clang --repo_env=CC=/usr/bin/clang --repo_env=CXX=/usr/bin/clang++ @llvm-project//...
```
6. If you are using **gcc** or **MSVC**, instead of `--config=generic_clang`
, pass `--config=generic_gcc` or `--config=generic_msvc`, which sets the
compiler to be `gcc` binary on the `PATH`.
```
bazel build --config=generic_gcc @llvm-project//...
```
To provide a specific path to your `gcc`, use the `--repo_env` Bazel flag.
For example:
```
bazel build --config=generic_gcc --repo_env=CC=/usr/bin/gcc --repo_env=CXX=/usr/bin/g++ @llvm-project//...
```
# Configuration