Require CMake 3.22 for Corrosion

Remove the Legacy Generator code and require at least CMake 3.22.
The stable/v0.4 branch will continue to support older CMake versions
for a while, but the main branch of corrosion will move on.

.github/workflows/test.yaml

@@ -9,58 +9,6 @@ on:
       - 'stable/**'
 jobs:
 
-  test_legacy_linux:
-    name: Test Corrosion (CMake 3.15)
-    uses: ./.github/workflows/test_legacy.yaml
-    with :
-      os: ubuntu-20.04
-      rust: 1.46.0
-  test_legacy_mac:
-    name: Test Corrosion (CMake 3.15)
-    uses: ./.github/workflows/test_legacy.yaml
-    with:
-      os: macos-12
-      rust: 1.54.0
-  test_legacy_windows:
-    name: Test Corrosion (CMake 3.15)
-    uses: ./.github/workflows/test_legacy.yaml
-    with:
-      os: windows-2019
-      rust: 1.46.0
-
-  test_legacy_stable:
-    name: Legacy CMake + stable Rust
-    uses: ./.github/workflows/test_legacy.yaml
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - windows-2019 # windows-latest is currently not having a supported MSVC compiler
-          - ubuntu-20.04
-          - macos-12
-    with:
-      os: ${{ matrix.os }}
-      rust: stable
-
-  test_legacy_nightly:
-    name: Legacy CMake + nightly Rust
-    uses: ./.github/workflows/test_legacy.yaml
-    with:
-      os: ubuntu-20.04
-      rust: nightly
-
-  test_legacy_new_lockfile_msrv:
-    name: Test MSRV of the new lockfile
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v3
-      - name: Install Rust
-        id: install_rust
-        uses: dtolnay/[email protected]
-      - name: Test Generator build with MSRV
-        run: cargo build
-        working-directory: generator
-
   test:
     name: Test Corrosion
     runs-on: ${{ matrix.os }}
@@ -82,35 +30,34 @@ jobs:
           - darwin
           - msvc
         cmake:
-          - 3.19.0
+          - 3.22.0
         rust:
-          # Our MSRV is already tested with the legacy generator, so just test the current stable rust here.
-          - stable
+          - "stable"
         generator:
           - default # This is just whatever the platform default is
           - ninja
         compiler: [default]
         include:
           - rust: nightly
-            cmake: 3.19.0
+            cmake: 3.22.0
             generator: ninja
             arch: x86_64
             abi: msvc
             os: windows-2019
           - rust: nightly
-            cmake: 3.19.0
+            cmake: 3.22.0
             generator: ninja
             arch: x86_64
             abi: gnu
             os: ubuntu-latest
           - rust: nightly
-            cmake: 3.19.0
+            cmake: 3.22.0
             generator: ninja
             arch: x86_64
             abi: darwin
             os: macos-12
           - rust: 1.54
-            cmake: 3.19.0
+            cmake: 3.22.0
             generator: ninja
             arch: x86_64
             abi: msvc
@@ -119,7 +66,7 @@ jobs:
           - os: ubuntu-latest
             arch: x86_64
             abi: gnu
-            cmake: 3.20.0
+            cmake: 3.22.0
             rust: 1.54
             generator: ninja-multiconfig
 
@@ -199,9 +146,9 @@ jobs:
           - arch: x86_64
             rust: 1.46.0
           - os: windows-2019
-            cmake: 3.20.6  # Multi-config Generators require at least CMake 3.20
+            cmake: 3.22.0  # Multi-config Generators require at least CMake 3.20
           - os: windows-2022
-            cmake: 3.21.5 # VS on windows-2022 requires at least CMake 3.21
+            cmake: 3.22.0
 
     steps:
       - uses: actions/checkout@v3
@@ -259,7 +206,7 @@ jobs:
         uses: "./.github/actions/setup_test"
         with:
           target_arch: x86_64
-          cmake: 3.15.7
+          cmake: 3.22.0
           rust: stable minus 2 releases
           abi: ${{ matrix.abi }}
           generator: ninja
@@ -290,7 +237,7 @@ jobs:
       - name: Install CMake
         uses: corrosion-rs/install-cmake@v2
         with:
-          cmake: 3.18.0
+          cmake: 3.22.0
           ninja: 1.10.0
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
@@ -334,11 +281,6 @@ jobs:
     name: bors-ci-status
     if: ${{ always() }}
     needs:
-      - test_legacy_linux
-      - test_legacy_mac
-      - test_legacy_windows
-      - test_legacy_stable
-      - test_legacy_new_lockfile_msrv
       - test
       - test_msvc
       - test_cxxbridge

CMakeLists.txt

@@ -1,11 +1,11 @@
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.22)
 project(Corrosion
     # Official releases will be major.minor.patch. When the `tweak` field is
     # set it indicates that we are on a commit, that is not a officially
     # tagged release. Users don't need to care about this, it is mainly to
     # clearly see in configure logs which version was used, without needing to
     # rely on `git`, since Corrosion may be installed or otherwise packaged.
-    VERSION 0.4.3
+    VERSION 0.4.99.99 # a 0.5-pre-release
     LANGUAGES NONE
     HOMEPAGE_URL "https://corrosion-rs.github.io/corrosion/"
 )
@@ -22,12 +22,6 @@ endif()
 
 # ==== Corrosion Configuration ====
 
-option(
-    CORROSION_DEV_MODE
-    "Enables some additional features if you're developing Corrosion"
-    ${_CORROSION_TOP_LEVEL}
-)
-
 option(
     CORROSION_BUILD_TESTS
     "Build Corrosion test project"
@@ -39,25 +33,18 @@ set(
   "Use prebuilt, non-bootstrapped corrosion-generator")
 mark_as_advanced(CORROSION_GENERATOR_EXECUTABLE)
 
-if (CORROSION_GENERATOR_EXECUTABLE)
-    add_executable(Corrosion::Generator IMPORTED GLOBAL)
-    set_property(
-        TARGET Corrosion::Generator
-        PROPERTY IMPORTED_LOCATION ${CORROSION_GENERATOR_EXECUTABLE})
-    set(CORROSION_INSTALL_EXECUTABLE_DEFAULT OFF)
-elseif(CORROSION_NATIVE_TOOLING OR CMAKE_VERSION VERSION_LESS 3.19.0)
-        set(CORROSION_INSTALL_EXECUTABLE_DEFAULT "ON")
-else()
-    set(CORROSION_INSTALL_EXECUTABLE_DEFAULT OFF)
-endif()
-
 option(
     CORROSION_INSTALL_EXECUTABLE
     "Controls whether corrosion-generator is installed with the package"
     ${CORROSION_INSTALL_EXECUTABLE_DEFAULT}
 )
 mark_as_advanced(CORROSION_INSTALL_EXECUTABLE)
 
+if (CORROSION_GENERATOR_EXECUTABLE OR CORROSION_INSTALL_EXECUTABLE)
+    message(FATAL_ERROR "The Cache variables CORROSION_GENERATOR_EXECUTABLE CORROSION_INSTALL_EXECUTABLE"
+            " were removed.")
+endif()
+
 if (_CORROSION_TOP_LEVEL)
     # We need to enable a language for corrosions test to work.
     # For projects using corrosion this is not needed
@@ -87,18 +74,6 @@ endif()
 
 include(GNUInstallDirs)
 
-if(CORROSION_INSTALL_EXECUTABLE)
-    get_property(
-            _CORROSION_GENERATOR_EXE
-            TARGET Corrosion::Generator PROPERTY IMPORTED_LOCATION
-    )
-    install(PROGRAMS "${_CORROSION_GENERATOR_EXE}" DESTINATION "${CMAKE_INSTALL_FULL_LIBEXECDIR}")
-else()
-    message(DEBUG "Not installing corrosion-generator since "
-        "`CORROSION_INSTALL_EXECUTABLE` is set to ${CORROSION_INSTALL_EXECUTABLE}"
-    )
-endif()
-
 # Generate the Config file
 include(CMakePackageConfigHelpers)
 

README.md

@@ -38,3 +38,13 @@ add_executable(your_cpp_bin main.cpp)
 target_link_libraries(your_cpp_bin PUBLIC rust-lib)
 ```
 
+## Requirements
+
+### Stable v0.4 Release
+
+- CMake 3.15 or newer. Some features may only be available on more recents CMake versions
+- Rust 1.46 or newer. Some platforms / features may require more recent Rust versions
+
+### Development (master branch)
+
+- CMake 3.22 or newer

RELEASES.md

@@ -1,3 +1,10 @@
+# Unreleased
+
+### Breaking Changes
+
+- The master branch of corrosion now requires CMake 3.22. See also the 
+  [v0.4.0 Release notes](#040-lts-2023-06-01) for more details.
+
 # v0.4.3 (2023-09-09)
 
 ### Fixes