Update llvm-project and toolset: MSVC Compiler 19.50.35719

CMakeLists.txt

@@ -6,8 +6,8 @@ cmake_minimum_required(VERSION 4.1.1)
 set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
 project(msvc_standard_libraries LANGUAGES CXX)
 
-if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.50.35717")
-    message(FATAL_ERROR "The STL must be built with MSVC Compiler 19.50.35717 or later.")
+if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.50.35719")
+    message(FATAL_ERROR "The STL must be built with MSVC Compiler 19.50.35719 or later.")
 endif()
 
 include(CheckCXXSourceCompiles)
@@ -46,7 +46,7 @@ if(TARGET run-validate)
     add_dependencies(validate run-validate)
 endif()
 
-option(BUILD_TESTING "Enable testing" ON)
+option(CONFIGURE_TESTING "Enable testing" ON)
 set(VCLIBS_SUFFIX "_oss" CACHE STRING "suffix for built DLL names to avoid conflicts with distributed DLLs")
 
 option(STL_USE_ANALYZE "Pass the /analyze flag to MSVC" OFF)
@@ -115,7 +115,7 @@ set(VCLIBS_DEBUG_OPTIONS "$<$<COMPILE_LANGUAGE:CXX>:/Od>")
 # TRANSITION, GH-2108: Investigate building the STL with only /O2, not /Os.
 set(VCLIBS_RELEASE_OPTIONS "$<$<COMPILE_LANGUAGE:CXX>:/O2;/Os>")
 
-if(BUILD_TESTING)
+if(CONFIGURE_TESTING)
     add_subdirectory(tests)
 endif()
 

azure-devops/build-and-test.yml

@@ -23,9 +23,15 @@ parameters:
 - name: numShards
   type: number
   default: 8
-- name: skipTesting
+- name: configureTesting
   type: boolean
-  default: false
+  default: true
+- name: buildStl
+  type: boolean
+  default: true
+- name: runTesting
+  type: boolean
+  default: true
 - name: testsBuildOnly
   type: boolean
   default: false
@@ -38,7 +44,7 @@ jobs:
   - template: checkout-self.yml
   - template: checkout-submodule.yml
     parameters:
-      enabled: ${{ not(parameters.skipTesting) }}
+      enabled: ${{ parameters.configureTesting }}
       path: 'llvm-project'
       url: 'https://github.com/llvm/llvm-project.git'
   - template: checkout-submodule.yml
@@ -58,6 +64,8 @@ jobs:
       targetPlatform: ${{ parameters.targetPlatform }}
       analyzeBuild: ${{ parameters.analyzeBuild }}
       asanBuild: ${{ parameters.asanBuild }}
+      configureTesting: ${{ parameters.configureTesting }}
+      buildStl: ${{ parameters.buildStl }}
       testsBuildOnly: ${{ parameters.testsBuildOnly }}
   - template: build-benchmarks.yml
     parameters:
@@ -79,4 +87,4 @@ jobs:
       targetArch: ${{ parameters.targetArch }}
       targetPlatform: ${{ parameters.targetPlatform }}
       testTargets: ${{ parameters.testTargets }}
-      skipTesting: ${{ parameters.skipTesting }}
+      runTesting: ${{ parameters.runTesting }}

azure-devops/build-benchmarks.yml

@@ -25,7 +25,7 @@ steps:
     -DSTL_BINARY_DIR="$(buildOutputLocation)" ^
     -DVCLIBS_TARGET_ARCHITECTURE=${{ parameters.targetPlatform }} ^
     -S $(Build.SourcesDirectory)/benchmarks -B "$(benchmarkBuildOutputLocation)\${{ parameters.compiler }}"
-  displayName: 'Configure the benchmarks for ${{ parameters.compiler }}'
+  displayName: 'Configure Benchmarks for ${{ parameters.compiler }}'
   timeoutInMinutes: 2
   env: { TMP: $(tmpDir), TEMP: $(tmpDir) }
   # TRANSITION, we currently only build the benchmarks with Clang for x64
@@ -36,7 +36,7 @@ steps:
 - script: |
     call "$(vsDevCmdBat)" -host_arch=${{ parameters.hostArch }} -arch=${{ parameters.targetArch }} -no_logo
     cmake --build "$(benchmarkBuildOutputLocation)\${{ parameters.compiler }}"
-  displayName: 'Build the benchmarks for ${{ parameters.compiler }}'
+  displayName: 'Build Benchmarks for ${{ parameters.compiler }}'
   timeoutInMinutes: 2
   env: { TMP: $(tmpDir), TEMP: $(tmpDir) }
   # TRANSITION, we currently only build the benchmarks with Clang for x64

azure-devops/checkout-self.yml

@@ -14,4 +14,4 @@ steps:
   retryCountOnTaskFailure: 4
 - script: |
     git clean --quiet -x -d -f -f
-  displayName: 'Clean after checkout'
+  displayName: 'Clean After Checkout'

azure-devops/cmake-configure-build.yml

@@ -12,6 +12,10 @@ parameters:
   type: boolean
 - name: asanBuild
   type: boolean
+- name: configureTesting
+  type: boolean
+- name: buildStl
+  type: boolean
 - name: testsBuildOnly
   type: boolean
 - name: litFlags
@@ -34,15 +38,17 @@ steps:
     -DLIT_FLAGS=${{ join(';', parameters.litFlags) }} ^
     -DSTL_USE_ANALYZE=${{ parameters.analyzeBuild }} ^
     -DSTL_ASAN_BUILD=${{ parameters.asanBuild }} ^
+    -DCONFIGURE_TESTING=${{ parameters.configureTesting }} ^
     -DTESTS_BUILD_ONLY=${{ parameters.testsBuildOnly }} ^
     -DVCLIBS_TARGET_ARCHITECTURE=${{ parameters.targetPlatform }} ^
     -S $(Build.SourcesDirectory) -B "$(buildOutputLocation)"
-  displayName: 'Configure the STL'
+  displayName: 'Configure STL'
   timeoutInMinutes: 2
   env: { TMP: $(tmpDir), TEMP: $(tmpDir) }
 - script: |
     call "$(vsDevCmdBat)" -host_arch=${{ parameters.hostArch }} -arch=${{ parameters.targetArch }} -no_logo
     cmake --build "$(buildOutputLocation)"
-  displayName: 'Build the STL'
+  displayName: 'Build STL'
   timeoutInMinutes: 5
+  condition: and(succeeded(), ${{ parameters.buildStl }})
   env: { TMP: $(tmpDir), TEMP: $(tmpDir) }

azure-devops/config.yml

@@ -5,10 +5,10 @@
 
 variables:
 - name: poolName
-  value: 'Stl-2025-11-17T2154-x64-Pool'
+  value: 'Stl-2025-11-24T1624-x64-Pool'
   readonly: true
 - name: arm64PoolName
-  value: 'Stl-2025-11-17T2237-arm64-Pool'
+  value: 'Stl-2025-11-24T1624-arm64-Pool'
   readonly: true
 - name: poolDemands
   value: 'EnableSpotVM -equals false'

azure-devops/create-1es-hosted-pool.ps1

@@ -29,8 +29,9 @@ if ($Arch -ieq 'x64') {
   $ImageOffer = 'WindowsServer'
   $ImageSku = '2025-datacenter-azure-edition'
 } else {
-  $AvailableLocations = @('eastus2', 'northeurope') # Locations where CPP_STL_GitHub has obtained sufficient quota.
-  $AvailableLocationIdx = 1 # Increment for each new pool, to cycle through the available locations.
+  # CPP_STL_GitHub has quota for 672 cores (21 VMs) in westcentralus, not currently used.
+  $AvailableLocations = @('eastus2', 'northeurope') # Locations where CPP_STL_GitHub has quota for 1024 cores (32 VMs).
+  $AvailableLocationIdx = 2 # Increment for each new pool, to cycle through the available locations.
   $Location = $AvailableLocations[$AvailableLocationIdx % $AvailableLocations.Length]
   $VMSize = 'Standard_D32ps_v6'
   $PoolSize = 32

azure-devops/format-validation.yml

@@ -16,7 +16,7 @@ jobs:
         call "$(vsDevCmdBat)" -host_arch=x64 -arch=x64 -no_logo
         cmake -G Ninja -S $(Build.SourcesDirectory)/tools -B "$(validationBuildOutputLocation)"
         cmake --build "$(validationBuildOutputLocation)"
-      displayName: 'Build format and validation'
+      displayName: 'Build Validation Tools'
       timeoutInMinutes: 5
       env: { TMP: $(tmpDir), TEMP: $(tmpDir) }
     - script: |

azure-devops/run-tests.yml

@@ -10,27 +10,27 @@ parameters:
   type: string
 - name: testTargets
   type: string
-- name: skipTesting
+- name: runTesting
   type: boolean
 steps:
 - script: |
     call "$(vsDevCmdBat)" -host_arch=${{ parameters.hostArch }} -arch=${{ parameters.targetArch }} -no_logo
     ninja --verbose -k 0 ${{ parameters.testTargets }}
-  displayName: 'Build and Run Tests'
+  displayName: 'Run Tests'
   timeoutInMinutes: 30
-  condition: and(succeeded(), not(${{ parameters.skipTesting }}))
+  condition: and(succeeded(), ${{ parameters.runTesting }})
   workingDirectory: $(buildOutputLocation)
   env: { TMP: $(tmpDir), TEMP: $(tmpDir) }
 - task: PublishTestResults@2
   displayName: 'Publish Tests'
   timeoutInMinutes: 5
-  condition: and(succeededOrFailed(), not(${{ parameters.skipTesting }}))
+  condition: and(succeededOrFailed(), ${{ parameters.runTesting }})
   inputs:
     searchFolder: $(buildOutputLocation)
     testResultsFormat: JUnit
     testResultsFiles: '**/test-results.xml'
     testRunTitle: 'test-${{ parameters.targetPlatform }}-$(System.JobPositionInPhase)'
 - publish: $(buildOutputLocation)/test-results.xml
   artifact: '${{ parameters.targetPlatform }}-$(System.JobPositionInPhase)-xml-$(System.JobId)'
-  condition: and(failed(), not(${{ parameters.skipTesting }}))
+  condition: and(failed(), ${{ parameters.runTesting }})
   displayName: 'Publish XML Artifact'

azure-pipelines.yml

@@ -34,7 +34,8 @@ stages:
           analyzeBuild: true
           buildBenchmarks: true
           numShards: 1
-          skipTesting: true
+          configureTesting: false
+          runTesting: false
 
   - stage: Build_x86
     dependsOn: []
@@ -51,7 +52,8 @@ stages:
           analyzeBuild: true
           buildBenchmarks: true
           numShards: 1
-          skipTesting: true
+          configureTesting: false
+          runTesting: false
 
   - stage: Build_ARM64_Cross
     dependsOn: []
@@ -68,7 +70,8 @@ stages:
           analyzeBuild: true
           buildBenchmarks: true
           numShards: 1
-          skipTesting: true
+          configureTesting: false
+          runTesting: false
 
   - stage: Build_ARM64EC_Cross
     dependsOn: []
@@ -85,7 +88,8 @@ stages:
           analyzeBuild: true
           buildBenchmarks: true
           numShards: 1
-          skipTesting: true
+          configureTesting: false
+          runTesting: false
 
   # This ARM64-native build will detect problems with the ARM64 pool as early as possible.
   # The stage dependencies are structured to optimize the critical path.
@@ -104,7 +108,24 @@ stages:
           analyzeBuild: true
           buildBenchmarks: true
           numShards: 1
-          skipTesting: true
+          configureTesting: false
+          runTesting: false
+
+  - stage: Configure_Tests
+    dependsOn: []
+    displayName: 'Configure Tests'
+    pool:
+      name: ${{ variables.poolName }}
+      demands: ${{ variables.poolDemands }}
+    jobs:
+      - template: azure-devops/build-and-test.yml
+        parameters:
+          hostArch: x64
+          targetArch: x64
+          targetPlatform: x64
+          numShards: 1
+          buildStl: false
+          runTesting: false
 
   - stage: Test_x64
     dependsOn:
@@ -113,6 +134,7 @@ stages:
       - Build_x86
       - Build_ARM64_Cross
       - Build_ARM64EC_Cross
+      - Configure_Tests
     displayName: 'Test x64'
     pool:
       name: ${{ variables.poolName }}

tests/CMakeLists.txt

@@ -1,6 +1,8 @@
 # Copyright (c) Microsoft Corporation.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+find_package(Python "3.14.0" REQUIRED COMPONENTS Interpreter)
+
 set(STL_BUILD_ROOT "${PROJECT_BINARY_DIR}/out")
 set(STL_SOURCE_DIR "${PROJECT_SOURCE_DIR}")
 set(STL_TEST_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}")
@@ -23,8 +25,6 @@ add_subdirectory(tr1)
 # chance to add to the config map and test directory global properties.
 add_subdirectory(utils/stl-lit)
 
-find_package(Python "3.14.0" REQUIRED COMPONENTS Interpreter)
-
 if(NOT DEFINED LIT_FLAGS)
     set(LIT_FLAGS "-o" "${CMAKE_CURRENT_BINARY_DIR}/test_results.json")
 endif()

tests/libcxx/CMakeLists.txt

@@ -1,6 +1,11 @@
 # Copyright (c) Microsoft Corporation.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+execute_process(
+  COMMAND "${Python_EXECUTABLE}" "${STL_SOURCE_DIR}/tools/scripts/check_libcxx_paths.py"
+  COMMAND_ERROR_IS_FATAL ANY
+)
+
 set(LIBCXX_ENVLST "${CMAKE_CURRENT_SOURCE_DIR}/usual_matrix.lst")
 set(LIBCXX_EXPECTED_RESULTS "${CMAKE_CURRENT_SOURCE_DIR}/expected_results.txt")
 set(LIBCXX_TEST_OUTPUT_DIR "${STL_TEST_OUTPUT_DIR}/libcxx")