build: explicit_this enabled for AppleClang 17 and MSVC 19.32

Both compilers do not implement the feature test macro, but they do
implement `explicit_this`, as mentioned in their corresponding release
notes:
- https://developer.apple.com/documentation/xcode-release-notes/xcode-16_3-release-notes
- https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes-v17.2

Resolves #722.

Author: alex-tee

conanfile.py

@@ -119,7 +119,7 @@ def _feature_compatibility(self):
                 "compiler": {
                     "gcc": "14",
                     "clang": "18",
-                    "apple-clang": "",
+                    "apple-clang": "17",
                     "msvc": "195",
                 },
             },

docs/getting_started/cpp_compiler_support.md

@@ -19,7 +19,7 @@ C++ feature:
 | **`std::format`**             |     20      | 13+  |    17+     |     16+     |                    194+                    |
 | **C++ modules**               |     20      | None |    17+     |    None     |                    None                    |
 | **`import std;`**             |     23      | None |    18+     |    None     |                    None                    |
-| **Explicit `this` parameter** |     23      | 14+  |    18+     |    None     |                    195+                    |
+| **Explicit `this` parameter** |     23      | 14+  |    18+     |    17+      |                    195+                    |
 
 ??? note "clang-19 unfixable bug"
 

src/CMakeLists.txt

@@ -65,15 +65,25 @@ if(NOT ${projectPrefix}LIB_FORMAT_SUPPORTED AND ${projectPrefix}LIBCXX)
     endif()
 endif()
 
-# clang++-18 supports explicit `this` parameter
-# https://github.com/llvm/llvm-project/issues/82780
 if(NOT ${projectPrefix}EXPLICIT_THIS_PARAMETER_SUPPORTED
    AND CMAKE_CXX_STANDARD GREATER_EQUAL 23
-   AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
-   AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "18"
 )
-    message(STATUS "Clang 18+ detected, overriding `no CRTP` support")
-    set(${projectPrefix}EXPLICIT_THIS_PARAMETER_SUPPORTED ON)
+    # clang++-18 supports explicit `this` parameter
+    # https://github.com/llvm/llvm-project/issues/82780
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "18")
+        message(STATUS "Clang 18+ detected, overriding `no CRTP` support")
+        set(${projectPrefix}EXPLICIT_THIS_PARAMETER_SUPPORTED ON)
+    # AppleClang 17 also supports explicit `this` parameter (feature check macro unimplemented)
+    # https://developer.apple.com/documentation/xcode-release-notes/xcode-16_3-release-notes
+    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "17")
+        message(STATUS "AppleClang 17+ detected, overriding `no CRTP` support")
+        set(${projectPrefix}EXPLICIT_THIS_PARAMETER_SUPPORTED ON)
+    # MSVC 19.32 also supports explicit `this` parameter (feature check macro unimplemented in this version)
+    # https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes-v17.2
+    elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "19.32")
+        message(STATUS "MSVC 19.32+ detected, overriding `no CRTP` support")
+        set(${projectPrefix}EXPLICIT_THIS_PARAMETER_SUPPORTED ON)
+    endif()
 endif()
 
 # project API settings