rustbuild: Move compiler-builtins build logic to manifest

This commit moves the compiler-builtins-specific build logic from
`src/bootstrap/bin/rustc.rs` into the workspace `Cargo.toml`'s
`[profile]` configuration. Now that rust-lang/cargo#7253 is fixed we can
ensure that Cargo knows about debug assertions settings, and it can also
be configured to specifically disable debug assertions unconditionally
for compiler-builtins. This should improve rebuild logic when
debug-assertions settings change and also improve build-std integration
where Cargo externally now has an avenue to learn how to build
compiler-builtins as well.

1 files changed, 8 insertions, 8 deletions

diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 0735ba8869a..c5e2a4a38cf 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -950,14 +950,6 @@ impl<'a> Builder<'a> {
             .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
             .env("RUSTC_REAL", self.rustc(compiler))
             .env("RUSTC_STAGE", stage.to_string())
-            .env(
-                "RUSTC_DEBUG_ASSERTIONS",
-                if mode == Mode::Std {
-                    self.config.rust_debug_assertions_std.to_string()
-                } else {
-                    self.config.rust_debug_assertions.to_string()
-                },
-            )
             .env("RUSTC_SYSROOT", &sysroot)
             .env("RUSTC_LIBDIR", &libdir)
             .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
@@ -1041,6 +1033,14 @@ impl<'a> Builder<'a> {
             }
         };
         cargo.env(profile_var("DEBUG"), debuginfo_level.to_string());
+        cargo.env(
+            profile_var("DEBUG_ASSERTIONS"),
+            if mode == Mode::Std {
+                self.config.rust_debug_assertions_std.to_string()
+            } else {
+                self.config.rust_debug_assertions.to_string()
+            },
+        );
 
         if !mode.is_tool() {
             cargo.env("RUSTC_FORCE_UNSTABLE", "1");