Allow windows resource compiler to be overridden

It is now required to provide a resource compiler on windows when
compiling rust. This allows toolchain builders to explicitly provide a
path to an alternative, such as llvm-rc, instead of the one that's
provided by the Windows SDK.

4 files changed, 14 insertions, 0 deletions

diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index 6121bf7d9cd..ee2bb710674 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -1227,6 +1227,11 @@ impl Builder<'_> {
             rustflags.arg("-Zehcont-guard");
         }
 
+        // Optionally override the rc.exe when compiling rustc on Windows.
+        if let Some(windows_rc) = &self.config.windows_rc {
+            cargo.env("RUSTC_WINDOWS_RC", windows_rc);
+        }
+
         // For `cargo doc` invocations, make rustdoc print the Rust version into the docs
         // This replaces spaces with tabs because RUSTDOCFLAGS does not
         // support arguments with regular spaces. Hopefully someday Cargo will
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index efb7ad91699..a97399b3d4a 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -273,6 +273,7 @@ pub struct Config {
     pub gdb: Option<PathBuf>,
     pub lldb: Option<PathBuf>,
     pub python: Option<PathBuf>,
+    pub windows_rc: Option<PathBuf>,
     pub reuse: Option<PathBuf>,
     pub cargo_native_static: bool,
     pub configure_args: Vec<String>,
@@ -450,6 +451,7 @@ impl Config {
             nodejs: build_nodejs,
             npm: build_npm,
             python: build_python,
+            windows_rc: build_windows_rc,
             reuse: build_reuse,
             locked_deps: build_locked_deps,
             vendor: build_vendor,
@@ -1342,6 +1344,7 @@ impl Config {
                 .unwrap_or(rust_debug == Some(true)),
             vendor,
             verbose_tests,
+            windows_rc: build_windows_rc.map(PathBuf::from),
             // tidy-alphabetical-end
         }
     }
diff --git a/src/bootstrap/src/core/config/toml/build.rs b/src/bootstrap/src/core/config/toml/build.rs
index 25c19f1070a..a9d4d3961c9 100644
--- a/src/bootstrap/src/core/config/toml/build.rs
+++ b/src/bootstrap/src/core/config/toml/build.rs
@@ -37,6 +37,7 @@ define_config! {
         nodejs: Option<String> = "nodejs",
         npm: Option<String> = "npm",
         python: Option<String> = "python",
+        windows_rc: Option<String> = "windows-rc",
         reuse: Option<String> = "reuse",
         locked_deps: Option<bool> = "locked-deps",
         vendor: Option<bool> = "vendor",
diff --git a/src/bootstrap/src/utils/change_tracker.rs b/src/bootstrap/src/utils/change_tracker.rs
index 2c48cebd2df..6b187578c31 100644
--- a/src/bootstrap/src/utils/change_tracker.rs
+++ b/src/bootstrap/src/utils/change_tracker.rs
@@ -551,4 +551,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "There is now a bootstrap option called `rust.parallel-frontend-threads`, which can be used to set the number of threads for the compiler frontend used during compilation of Rust code.",
     },
+    ChangeInfo {
+        change_id: 146663,
+        severity: ChangeSeverity::Info,
+        summary: "New option `build.windows-rc` that will override which resource compiler on Windows will be used to compile Rust.",
+    },
 ];