Darwin: Move warning settings into the Xcode project (#32828)

* Darwin: Sort some project sections for easier maintenance

* Darwin: Move warning settings into the Xcode project

Enable warnings in the build settings rather than feeding them in during CI
builds only. Also build targets within the project with MTR_NO_AVAILABILITY=1
and provisional / experimental APIs enabled. This means actual warnings now
don't get drowned out by thousands of availability warnings.

Explicitly suppress certain warnings within third-party code in dft.

* Adjust xcodebuild args for darwin-framework-tool

* Also adjust xcodebuild args for building unit tests

* Availability is now tested via MTRAvailabilityTests

* Remove iOS-debug CI variant to reduce load

* Whitespace

* Darwin: Remove some framework sources from the dft target

.github/workflows/darwin-tests.yaml

@@ -72,15 +72,7 @@ jobs:
 
             - name: Run macOS Darwin Framework Tool Build Debug
               working-directory: src/darwin/Framework
-              # Keep whatever Xcode settings
-              # for OTHER_CFLAGS exist by using ${inherited}.
-              #
-              # Enable -Wconversion by hand as well, because it seems to not be
-              # enabled by default in the Xcode config.
-              #
-              # Disable availability annotations, since we are not building against a system
-              # Matter.framework.
-              run: xcodebuild -target "darwin-framework-tool" -sdk macosx -configuration Debug OTHER_CFLAGS='${inherited} -Wconversion' GCC_PREPROCESSOR_DEFINITIONS='${inherited} MTR_NO_AVAILABILITY=1'
+              run: xcodebuild -target "darwin-framework-tool" -sdk macosx -configuration Debug
             - name: Delete Defaults
               run: defaults delete com.apple.dt.xctest.tool
               continue-on-error: true

.github/workflows/darwin.yaml

@@ -35,16 +35,14 @@ jobs:
         strategy:
             matrix:
                 options: # We don't need a full matrix
-                    - flavor: macos-release-availability
-                      arguments: -sdk macosx -configuration Release   WARNING_CFLAGS='${inherited} -Werror -Wconversion -Wno-unguarded-availability-new'
+                    - flavor: macos-release
+                      arguments: -sdk macosx -configuration Release
                     - flavor: ios-release
-                      arguments: -sdk iphoneos -configuration Release WARNING_CFLAGS='${inherited} -Werror -Wconversion' GCC_PREPROCESSOR_DEFINITIONS='${inherited} MTR_NO_AVAILABILITY=1'
-                    - flavor: ios-debug
-                      arguments: -sdk iphoneos -configuration Debug   WARNING_CFLAGS='${inherited} -Werror -Wconversion' GCC_PREPROCESSOR_DEFINITIONS='${inherited} MTR_NO_AVAILABILITY=1'
+                      arguments: -sdk iphoneos -configuration Release
                     - flavor: tvos-debug
-                      arguments: -sdk appletvos -configuration Debug  WARNING_CFLAGS='${inherited} -Werror -Wconversion' GCC_PREPROCESSOR_DEFINITIONS='${inherited} MTR_NO_AVAILABILITY=1'
+                      arguments: -sdk appletvos -configuration Debug
                     - flavor: watchos-debug
-                      arguments: -sdk watchos -configuration Debug    WARNING_CFLAGS='${inherited} -Werror -Wconversion' GCC_PREPROCESSOR_DEFINITIONS='${inherited} MTR_NO_AVAILABILITY=1'
+                      arguments: -sdk watchos -configuration Debug
         steps:
             - name: Checkout
               uses: actions/checkout@v4
@@ -113,7 +111,7 @@ jobs:
 
                   # Disable BLE (CHIP_IS_BLE=NO) because the app does not have the permission to use it and that may crash the CI.
                   xcodebuild test -target "Matter" -scheme "Matter Framework Tests" -sdk macosx ${{ matrix.options.arguments }} \
-                    OTHER_CFLAGS='${inherited} -Werror -Wconversion' CHIP_IS_BLE=NO GCC_PREPROCESSOR_DEFINITIONS='${inherited} MTR_NO_AVAILABILITY=1 ${{ matrix.options.defines }}' \
+                    CHIP_IS_BLE=NO GCC_PREPROCESSOR_DEFINITIONS='${inherited} ${{ matrix.options.defines }}' \
                     > >(tee /tmp/darwin/framework-tests/darwin-tests.log) 2> >(tee /tmp/darwin/framework-tests/darwin-tests-err.log >&2)
             - name: Collect crash logs
               if: failure() && !env.ACT

src/darwin/Framework/CHIPTests/MTRAvailabilityTests.m

@@ -0,0 +1,25 @@
+/**
+ *    Copyright (c) 2024 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#import <Matter/Matter.h>
+
+// The purpose of this test is to ensure that our availablity annotations are
+// at least syntactically valid, because within the project we generally
+// compile everything with MTR_NO_AVAILABILITY=1 (so that we can internally use
+// and test features of Matter.framework independently of when they will ship.)
+#if MTR_NO_AVAILABILITY
+#error This test must be compiled with MTR_NO_AVAILABILITY=0
+#endif