[bazel][docs] Update build documentation
Reviewed By: rnk
Differential Revision: https://reviews.llvm.org/D155004
diff --git a/utils/bazel/README.md b/utils/bazel/README.md
index 3178504..ba74947 100644
--- a/utils/bazel/README.md
+++ b/utils/bazel/README.md
@@ -29,11 +29,19 @@
2. Install Bazel at the version indicated by [.bazelversion](./.bazelversion),
following the official instructions, if you don't have it installed yet:
https://docs.bazel.build/versions/main/install.html.
+ * You can also install and use
+ [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 building on Unix
- with Clang/LLD). `--config=generic_gcc` and `--config=msvc` are also
- available.
-
+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`
# Configuration
@@ -66,12 +74,6 @@
Bear in mind that this requires that your ramdisk is of sufficient size to hold
any temporary files. Anecdotally, 1GB should be sufficient.
-To specify a specific local compiler to use, add the following bazel flag:
-
-```.bazelrc
-build --repo_env=CC=$PATH_TO_CC
-```
-
# Coverage
The LLVM, MLIR, and Clang subprojects have configurations for Linux (Clang and
