Auto merge of rust-lang#132721 - MarcoIeni:mingw-split, r=<try>

CI: split x86_64-mingw job

try-job: x86_64-mingw-1
try-job: x86_64-mingw-2

src/bootstrap/mk/Makefile.in

@@ -108,11 +108,16 @@ ci-msvc: ci-msvc-py ci-msvc-ps1
 
 ## MingW native builders
 
+# Set of tests that should represent half of the time of the test suite.
+# Used to split tests across multiple CI runners.
+TESTS_IN_MINGW_2 := \
+	tests/ui
+
 # test both x and bootstrap entrypoints
 ci-mingw-x:
-	$(Q)$(CFG_SRC_DIR)/x test --stage 2 tidy
+	$(Q)$(CFG_SRC_DIR)/x test --stage 2 $(TESTS_IN_MINGW_2:%=--exclude %)
 ci-mingw-bootstrap:
-	$(Q)$(BOOTSTRAP) test --stage 2 --skip tidy
+	$(Q)$(BOOTSTRAP) test --stage 2 $(TESTS_IN_MINGW_2)
 ci-mingw: ci-mingw-x ci-mingw-bootstrap
 
 .PHONY: dist

src/ci/github-actions/jobs.yml

@@ -431,9 +431,18 @@ auto:
       NO_DOWNLOAD_CI_LLVM: 1
     <<: *job-windows-8c
 
-  - image: x86_64-mingw
+  - image: x86_64-mingw-1
     env:
-      SCRIPT: make ci-mingw
+      SCRIPT: make ci-mingw-x
+      RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu
+      # We are intentionally allowing an old toolchain on this builder (and that's
+      # incompatible with LLVM downloads today).
+      NO_DOWNLOAD_CI_LLVM: 1
+    <<: *job-windows-8c
+
+  - image: x86_64-mingw-2
+    env:
+      SCRIPT: make ci-mingw-bootstrap
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu
       # We are intentionally allowing an old toolchain on this builder (and that's
       # incompatible with LLVM downloads today).

src/ci/shared.sh

@@ -53,7 +53,8 @@ function isLinux {
 }
 
 function isKnownToBeMingwBuild {
-    isGitHubActions && [[ "${CI_JOB_NAME}" == *mingw ]]
+    # CI_JOB_NAME must contain "mingw" to be considered a MinGW build.
+    isGitHubActions && [[ "${CI_JOB_NAME}" == *mingw* ]]
 }
 
 function isCiBranch {