Detect host platform automatically.

Author: werat

.bazelrc

@@ -1,5 +1,5 @@
-# Try loading per-user configuration.
-try-import %workspace%/user.bazelrc
+# Make Bazel pickup Linux/Windows configs automatically.
+build --enable_platform_specific_config
 
 # Linux-specific configuration.
 build:linux --cxxopt=-std=c++17
@@ -56,3 +56,6 @@ build:ubsan --copt=-fno-omit-frame-pointer
 build:ubsan --copt=-DNDEBUG
 build:ubsan --copt=-fno-sanitize=function,vptr
 build:ubsan --linkopt=-fsanitize=undefined
+
+# Try loading per-user configuration.
+try-import %workspace%/user.bazelrc

README.md

@@ -87,10 +87,10 @@ Now you can build and test `lldb-eval`:
 
 ```bash
 # Build and run all tests
-bazel test --config=linux :all
+bazel test :all
 
 # Evaluate a sample expression
-bazel run --config=windows :main -- "(1 + 2) * 42 / 4"
+bazel run :main -- "(1 + 2) * 42 / 4"
 ```
 
 > **Hint:** You can add this option to your `user.bazelrc` !
@@ -111,7 +111,7 @@ configuration. Check [Bazel docs](https://docs.bazel.build/versions/master/guide
 for the format. For example:
 
 ```bash
-# Building on Linux
+# Building on Linux (usually don't need this, Bazel detects automatically)
 build --config=linux
 # Using statically linked liblldb.so
 build --@llvm_project//:llvm_build=static