config: add the option to enable LLVM tests

I'm working on some LLVM patches in concert with a Rust patch, and it's
helping me quite a bit to have this as an option. It doesn't seem that
hard, so I figured I'd formalize it in x.py and send it upstream.

config.toml.example

@@ -68,6 +68,12 @@ changelog-seen = 2
 # Indicates whether the LLVM assertions are enabled or not
 #assertions = false
 
+# Indicates whether the LLVM testsuite is enabled in the build or not. Does
+# not execute the tests as part of the build as part of x.py build et al,
+# just makes it possible to do `ninja check-llvm` in the staged LLVM build
+# directory when doing LLVM development as part of Rust development.
+#tests = false
+
 # Indicates whether the LLVM plugin is enabled or not
 #plugins = false
 

src/bootstrap/config.rs

@@ -90,6 +90,7 @@ pub struct Config {
     // llvm codegen options
     pub llvm_skip_rebuild: bool,
     pub llvm_assertions: bool,
+    pub llvm_tests: bool,
     pub llvm_plugins: bool,
     pub llvm_optimize: bool,
     pub llvm_thin_lto: bool,
@@ -422,6 +423,7 @@ struct Llvm {
     thin_lto: Option<bool>,
     release_debuginfo: Option<bool>,
     assertions: Option<bool>,
+    tests: Option<bool>,
     plugins: Option<bool>,
     ccache: Option<StringOrBool>,
     version_check: Option<bool>,
@@ -715,6 +717,7 @@ impl Config {
         // Store off these values as options because if they're not provided
         // we'll infer default values for them later
         let mut llvm_assertions = None;
+        let mut llvm_tests = None;
         let mut llvm_plugins = None;
         let mut debug = None;
         let mut debug_assertions = None;
@@ -740,6 +743,7 @@ impl Config {
             }
             set(&mut config.ninja_in_file, llvm.ninja);
             llvm_assertions = llvm.assertions;
+            llvm_tests = llvm.tests;
             llvm_plugins = llvm.plugins;
             llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
             set(&mut config.llvm_optimize, llvm.optimize);
@@ -991,6 +995,7 @@ impl Config {
 
         config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
         config.llvm_assertions = llvm_assertions.unwrap_or(false);
+        config.llvm_tests = llvm_tests.unwrap_or(false);
         config.llvm_plugins = llvm_plugins.unwrap_or(false);
         config.rust_optimize = optimize.unwrap_or(true);
 

src/bootstrap/native.rs

@@ -170,6 +170,7 @@ impl Step for Llvm {
 
         let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
         let plugins = if builder.config.llvm_plugins { "ON" } else { "OFF" };
+        let enable_tests = if builder.config.llvm_tests { "ON" } else { "OFF" };
 
         cfg.out_dir(&out_dir)
             .profile(profile)
@@ -180,7 +181,7 @@ impl Step for Llvm {
             .define("LLVM_INCLUDE_EXAMPLES", "OFF")
             .define("LLVM_INCLUDE_DOCS", "OFF")
             .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
-            .define("LLVM_INCLUDE_TESTS", "OFF")
+            .define("LLVM_INCLUDE_TESTS", enable_tests)
             .define("LLVM_ENABLE_TERMINFO", "OFF")
             .define("LLVM_ENABLE_LIBEDIT", "OFF")
             .define("LLVM_ENABLE_BINDINGS", "OFF")