ci: stabilize Win7 sccache cache keys with /Brepro

.github/fixtures/win7-host-repro-config.toml

@@ -0,0 +1,5 @@
+# sccache hashes proc-macro DLLs as downstream compiler inputs.
+target-applies-to-host = false
+
+[host.x86_64-pc-windows-msvc]
+rustflags = ["-Clink-arg=/Brepro"]

.github/scripts/ci-workflow.test.mjs

@@ -147,6 +147,12 @@ test("Windows compatibility jobs cache Rust compilation without wrapping C or C+
   assert.ok(win7.includes("fc920bf0ec8de6ee65d409111f7ec508035751ba"));
   assert.ok(win7.includes('version: "v0.16.0"'));
   assert.ok(win7.includes("sccache --show-stats"));
+  for (const flag of ["-Z host-config", "-Z target-applies-to-host", "-Z build-std=std,panic_abort"]) assert.ok(win7.includes(flag));
+  assert.ok(win7.includes("--config .github/fixtures/win7-host-repro-config.toml"));
+  const hostConfig = readFileSync(new URL("../fixtures/win7-host-repro-config.toml", import.meta.url), "utf8");
+  assert.ok(hostConfig.includes("target-applies-to-host = false"));
+  assert.ok(hostConfig.includes('[host.x86_64-pc-windows-msvc]'));
+  assert.ok(hostConfig.includes('rustflags = ["-Clink-arg=/Brepro"]'));
   assert.ok(win7.includes("--timings"));
   assert.ok(win7.includes("name: DBX-win7-cargo-timings"));
   assert.ok(win7.includes("path: target/cargo-timings/"));

.github/workflows/ci.yml

@@ -519,7 +519,10 @@ jobs:
         shell: pwsh
         run: |
           $env:TAURI_CONFIG = Get-Content src-tauri/tauri.webview2-win7-fixed.conf.json -Raw
-          cargo build --locked --package dbx --release --features custom-protocol --target x86_64-win7-windows-msvc -Z build-std=std,panic_abort --timings
+          cargo -Z host-config -Z target-applies-to-host -Z build-std=std,panic_abort `
+            --config .github/fixtures/win7-host-repro-config.toml `
+            build --locked --package dbx --release --features custom-protocol `
+            --target x86_64-win7-windows-msvc --timings
 
       - name: Upload Windows 7 Cargo timings
         if: always()

apps/desktop/src/lib/__tests__/windowsInstallerTemplate.spec.ts

@@ -187,7 +187,8 @@ describe("Windows 7 fixed WebView2 runtime bundle", () => {
     expect(appCargoToml).toContain('custom-protocol = ["tauri/custom-protocol"]');
     expect(appBuildScript).toContain("CARGO_FEATURE_CUSTOM_PROTOCOL");
     expect(appBuildScript).toContain("CARGO_CFG_TARGET_VENDOR");
-    expect(ciWorkflow).toContain("--release --features custom-protocol --target x86_64-win7-windows-msvc");
+    expect(ciWorkflow).toContain("build --locked --package dbx --release --features custom-protocol");
+    expect(ciWorkflow).toContain("--target x86_64-win7-windows-msvc --timings");
     expect(releaseWorkflow).toContain("--release --features custom-protocol --target x86_64-win7-windows-msvc");
     expect(ciWorkflow).toContain("TAURI_CONFIG = Get-Content src-tauri/tauri.webview2-win7-fixed.conf.json -Raw");
     expect(releaseWorkflow).toContain("TAURI_CONFIG = Get-Content src-tauri/tauri.webview2-win7-fixed.conf.json -Raw");