Auto merge of #60262 - michaelwoerister:pgo-preinlining-pass, r=alexcrichton

 PGO: Add a run-make test that makes sure that PGO profiling data is used by the compiler during optimizations.

From the tests comment section:
```
# This test makes sure that PGO profiling data leads to cold functions being
# marked as `cold` and hot functions with `inlinehint`.
# The test program contains an `if` were actual execution only ever takes the
# `else` branch. Accordingly, we expect the function that is never called to
# be marked as cold.
```

r? @alexcrichton

3 files changed, 14 insertions, 1 deletions

diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
index 089cbc7b78a..4699dee1716 100644
--- a/src/tools/compiletest/src/common.rs
+++ b/src/tools/compiletest/src/common.rs
@@ -144,6 +144,9 @@ pub struct Config {
     /// The LLVM `FileCheck` binary path.
     pub llvm_filecheck: Option<PathBuf>,
 
+    /// Path to LLVM's bin directory.
+    pub llvm_bin_dir: Option<PathBuf>,
+
     /// The valgrind path.
     pub valgrind_path: Option<String>,
 
diff --git a/src/tools/compiletest/src/main.rs b/src/tools/compiletest/src/main.rs
index 431fd7969be..dc5d1b9a853 100644
--- a/src/tools/compiletest/src/main.rs
+++ b/src/tools/compiletest/src/main.rs
@@ -221,6 +221,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
             "LIST",
         )
         .reqopt("", "llvm-cxxflags", "C++ flags for LLVM", "FLAGS")
+        .optopt("", "llvm-bin-dir", "Path to LLVM's `bin` directory", "PATH")
         .optopt("", "nodejs", "the name of nodejs", "PATH")
         .optopt(
             "",
@@ -306,7 +307,8 @@ pub fn parse_config(args: Vec<String>) -> Config {
         valgrind_path: matches.opt_str("valgrind-path"),
         force_valgrind: matches.opt_present("force-valgrind"),
         run_clang_based_tests_with: matches.opt_str("run-clang-based-tests-with"),
-        llvm_filecheck: matches.opt_str("llvm-filecheck").map(|s| PathBuf::from(&s)),
+        llvm_filecheck: matches.opt_str("llvm-filecheck").map(PathBuf::from),
+        llvm_bin_dir: matches.opt_str("llvm-bin-dir").map(PathBuf::from),
         src_base,
         build_base: opt_path(matches, "build-base"),
         stage_id: matches.opt_str("stage-id").unwrap(),
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 9db16b69e5f..42f9cdb7886 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2691,6 +2691,14 @@ impl<'test> TestCx<'test> {
             cmd.env("CLANG", clang);
         }
 
+        if let Some(ref filecheck) = self.config.llvm_filecheck {
+            cmd.env("LLVM_FILECHECK", filecheck);
+        }
+
+        if let Some(ref llvm_bin_dir) = self.config.llvm_bin_dir {
+            cmd.env("LLVM_BIN_DIR", llvm_bin_dir);
+        }
+
         // We don't want RUSTFLAGS set from the outside to interfere with
         // compiler flags set in the test cases:
         cmd.env_remove("RUSTFLAGS");