Remove FetchContent from the compiler

.github/workflows/presubmit.yml

@@ -21,35 +21,44 @@ permissions:
 jobs:
   check_clang_format:
     name: Check clang-format and ruff
-    runs-on: macos-14
+    runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install clang-format
         run: brew install llvm@21
 
       - name: Check clang-format
         run: ./run-clang-format.sh -c
-        env:
-          CLANG_FORMAT_LLVM_INSTALL_DIR: /opt/homebrew/opt/llvm@21
 
       - uses: astral-sh/ruff-action@v3
+
   check_clang_tidy:
     name: Check clang-tidy
-    runs-on: macos-14
+    runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Install clang-tidy
-        run: brew install llvm@21 ninja lld@21
+      - uses: actions/checkout@v6
+
+      - uses: actions/checkout@v6
+        with:
+          repository: microsoft/vcpkg
+          path: vcpkg
+          ref: 2026.01.16
+          fetch-depth: 0  # need all history for vcpkg's versioning mechanism to work
+
+      - name: Install dependencies
+        run: brew install lld@21 llvm@21
+
       - name: Run clang-tidy
         run: ./run-clang-tidy.sh
         env:
-          CLANG_TIDY_LLVM_INSTALL_DIR: /opt/homebrew/opt/llvm@21
+          VCPKG_ROOT: ${{ github.workspace }}/vcpkg
+
   check_cmake_file_lists:
     name: Check CMake file lists
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Run test sources check
         run: |
           shopt -s nullglob

CMakeLists.txt

@@ -1,24 +1,4 @@
 cmake_minimum_required(VERSION 3.28)
-
-# TODO: remove this after updating build bots.
-if (CMAKE_TOOLCHAIN_FILE MATCHES "vcpkg")
-    if (NOT DEFINED VCPKG_OVERLAY_PORTS)
-        set(VCPKG_OVERLAY_PORTS "${CMAKE_CURRENT_LIST_DIR}/cmake/vcpkg")
-    endif ()
-
-    if (NOT DEFINED VCPKG_MANIFEST_FEATURES)
-        set(VCPKG_MANIFEST_FEATURES developer)
-    endif ()
-
-    # vcpkg and FetchContent are incompatible
-    set(Halide_USE_FETCHCONTENT OFF)
-endif ()
-
-option(Halide_USE_FETCHCONTENT "When Halide is top-level, use FetchContent for build-time dependencies." ON)
-if (Halide_USE_FETCHCONTENT)
-    list(APPEND CMAKE_PROJECT_TOP_LEVEL_INCLUDES "${CMAKE_CURRENT_LIST_DIR}/cmake/dependencies.cmake")
-endif ()
-
 project(Halide
         VERSION 22.0.0
         DESCRIPTION "Halide compiler and libraries"