From d0b58f40a0e669897fafb614299d2a989997eda7 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Tue, 25 Jul 2023 13:11:50 -0700
Subject: [PATCH] Allow using external builds of the compiler-rt profile lib

This changes the bootstrap config `target.*.profiler` from a plain bool
to also allow a string, which will be used as a path to the pre-built
profiling runtime for that target. Then `profiler_builtins/build.rs`
reads that in a `LLVM_PROFILER_RT_LIB` environment variable.
---
 config.example.toml                |  6 ++++--
 library/profiler_builtins/build.rs |  6 ++++++
 src/bootstrap/compile.rs           |  4 ++++
 src/bootstrap/config.rs            | 30 ++++++++++++++++++++++++------
 4 files changed, 38 insertions(+), 8 deletions(-)

--- a/config.example.toml
+++ b/config.example.toml
@@ -745,8 +745,10 @@ changelog-seen = 2
 # This option will override the same option under [build] section.
 #sanitizers = build.sanitizers (bool)
 
-# Build the profiler runtime for this target(required when compiling with options that depend
-# on this runtime, such as `-C profile-generate` or `-C instrument-coverage`).
+# When true, build the profiler runtime for this target(required when compiling
+# with options that depend on this runtime, such as `-C profile-generate` or
+# `-C instrument-coverage`). This may also be given a path to an existing build
+# of the profiling runtime library from LLVM's compiler-rt.
 # This option will override the same option under [build] section.
 #profiler = build.profiler (bool)
 
--- a/library/profiler_builtins/build.rs
+++ b/library/profiler_builtins/build.rs
@@ -6,6 +6,12 @@ use std::env;
 use std::path::Path;
 
 fn main() {
+    println!("cargo:rerun-if-env-changed=LLVM_PROFILER_RT_LIB");
+    if let Ok(rt) = env::var("LLVM_PROFILER_RT_LIB") {
+        println!("cargo:rustc-link-lib=static:+verbatim={rt}");
+        return;
+    }
+
     let target = env::var("TARGET").expect("TARGET was not set");
     let cfg = &mut cc::Build::new();
 
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -314,6 +314,10 @@ pub fn std_cargo(builder: &Builder<'_>,
         cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
     }
 
+    if let Some(path) = builder.config.profiler_path(target) {
+        cargo.env("LLVM_PROFILER_RT_LIB", path);
+    }
+
     // Determine if we're going to compile in optimized C intrinsics to
     // the `compiler-builtins` crate. These intrinsics live in LLVM's
     // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -454,7 +454,7 @@ pub struct Target {
     pub linker: Option<PathBuf>,
     pub ndk: Option<PathBuf>,
     pub sanitizers: Option<bool>,
-    pub profiler: Option<bool>,
+    pub profiler: Option<StringOrBool>,
     pub crt_static: Option<bool>,
     pub musl_root: Option<PathBuf>,
     pub musl_libdir: Option<PathBuf>,
@@ -715,9 +715,9 @@ define_config! {
     }
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Clone, Debug, Deserialize)]
 #[serde(untagged)]
-enum StringOrBool {
+pub enum StringOrBool {
     String(String),
     Bool(bool),
 }
@@ -728,6 +728,12 @@ impl Default for StringOrBool {
     }
 }
 
+impl StringOrBool {
+    fn is_string_or_true(&self) -> bool {
+        matches!(self, Self::String(_) | Self::Bool(true))
+    }
+}
+
 define_config! {
     /// TOML representation of how the Rust build is configured.
     struct Rust {
@@ -799,7 +805,7 @@ define_config! {
         llvm_libunwind: Option<String> = "llvm-libunwind",
         android_ndk: Option<String> = "android-ndk",
         sanitizers: Option<bool> = "sanitizers",
-        profiler: Option<bool> = "profiler",
+        profiler: Option<StringOrBool> = "profiler",
         crt_static: Option<bool> = "crt-static",
         musl_root: Option<String> = "musl-root",
         musl_libdir: Option<String> = "musl-libdir",
@@ -1616,12 +1622,24 @@ impl Config {
         self.target_config.values().any(|t| t.sanitizers == Some(true)) || self.sanitizers
     }
 
+    pub fn profiler_path(&self, target: TargetSelection) -> Option<&str> {
+        match self.target_config.get(&target)?.profiler.as_ref()? {
+            StringOrBool::String(s) => Some(s),
+            StringOrBool::Bool(_) => None,
+        }
+    }
+
     pub fn profiler_enabled(&self, target: TargetSelection) -> bool {
-        self.target_config.get(&target).map(|t| t.profiler).flatten().unwrap_or(self.profiler)
+        self.target_config
+            .get(&target)
+            .and_then(|t| t.profiler.as_ref())
+            .map(StringOrBool::is_string_or_true)
+            .unwrap_or(self.profiler)
     }
 
     pub fn any_profiler_enabled(&self) -> bool {
-        self.target_config.values().any(|t| t.profiler == Some(true)) || self.profiler
+        self.target_config.values().any(|t| matches!(&t.profiler, Some(p) if p.is_string_or_true()))
+            || self.profiler
     }
 
     pub fn llvm_enabled(&self) -> bool {