[cmake] update CMake configurations for Apple platforms (#12729)

This commit updates various CMake configuration files to simplify
the check for Apple platforms. It replaces the `CMAKE_CXX_COMPILER_ID`
check for `AppleClang` with the built-in `APPLE` variable across
multiple targets (such as `ftd`, `mtd`, `cli`, and others). This
ensures that Apple-specific linker and compiler flags (like `-Wl,-map`
and `-Wimplicit-int-conversion`) are correctly applied when building
on macOS, regardless of the specific compiler used.

Additionally, this commit updates `CMakeLists.txt` to explicitly set
the `CMAKE_AR` and `CMAKE_RANLIB` paths to the default system
locations (`/usr/bin/ar` and `/usr/bin/ranlib`) when the `APPLE`
variable is set.

CMakeLists.txt

@@ -49,6 +49,11 @@ set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_C_EXTENSIONS OFF)
 set(CMAKE_C_STANDARD 99)
 
+if(APPLE)
+    set(CMAKE_AR "/usr/bin/ar")
+    set(CMAKE_RANLIB "/usr/bin/ranlib")
+endif()
+
 message(STATUS "OpenThread Source Directory: ${PROJECT_SOURCE_DIR}")
 
 target_include_directories(ot-config INTERFACE

examples/apps/cli/ftd.cmake

@@ -56,7 +56,7 @@ target_link_libraries(ot-cli-ftd PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-cli-ftd PRIVATE -Wl,-map,ot-cli-ftd.map)
     else()
         target_link_libraries(ot-cli-ftd PRIVATE -Wl,-Map=ot-cli-ftd.map)

examples/apps/cli/mtd.cmake

@@ -56,7 +56,7 @@ target_link_libraries(ot-cli-mtd PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-cli-mtd PRIVATE -Wl,-map,ot-cli-mtd.map)
     else()
         target_link_libraries(ot-cli-mtd PRIVATE -Wl,-Map=ot-cli-mtd.map)

examples/apps/cli/radio.cmake

@@ -60,7 +60,7 @@ target_link_libraries(ot-cli-radio PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-cli-radio PRIVATE -Wl,-map,ot-cli-radio.map)
     else()
         target_link_libraries(ot-cli-radio PRIVATE -Wl,-Map=ot-cli-radio.map)

examples/apps/ncp/ftd.cmake

@@ -49,7 +49,7 @@ target_link_libraries(ot-ncp-ftd PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-ncp-ftd PRIVATE -Wl,-map,ot-ncp-ftd.map)
     else()
         target_link_libraries(ot-ncp-ftd PRIVATE -Wl,-Map=ot-ncp-ftd.map)

examples/apps/ncp/mtd.cmake

@@ -49,7 +49,7 @@ target_link_libraries(ot-ncp-mtd PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-ncp-mtd PRIVATE -Wl,-map,ot-ncp-mtd.map)
     else()
         target_link_libraries(ot-ncp-mtd PRIVATE -Wl,-Map=ot-ncp-mtd.map)

examples/apps/ncp/rcp.cmake

@@ -48,7 +48,7 @@ target_link_libraries(ot-rcp PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-rcp PRIVATE -Wl,-map,ot-rcp.map)
     else()
         target_link_libraries(ot-rcp PRIVATE -Wl,-Map=ot-rcp.map)

src/core/ftd.cmake

@@ -39,7 +39,7 @@ target_compile_options(openthread-ftd PRIVATE
     -Wundef
 )
 
-if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+if(APPLE)
     target_compile_options(openthread-ftd PRIVATE -Wimplicit-int-conversion)
 endif()
 

src/core/mtd.cmake

@@ -39,7 +39,7 @@ target_compile_options(openthread-mtd PRIVATE
     -Wundef
 )
 
-if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+if(APPLE)
     target_compile_options(openthread-mtd PRIVATE -Wimplicit-int-conversion)
 endif()
 

src/core/radio.cmake

@@ -40,7 +40,7 @@ target_compile_options(openthread-radio PRIVATE
     -Wundef
 )
 
-if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+if(APPLE)
     target_compile_options(openthread-radio PRIVATE -Wimplicit-int-conversion)
 endif()
 

src/posix/cli.cmake

@@ -59,7 +59,7 @@ target_link_libraries(ot-cli PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-cli PRIVATE -Wl,-map,ot-cli.map)
     else()
         target_link_libraries(ot-cli PRIVATE -Wl,-Map=ot-cli.map)

src/posix/daemon.cmake

@@ -51,7 +51,7 @@ target_link_libraries(ot-daemon PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-daemon PRIVATE -Wl,-map,ot-daemon.map)
     else()
         target_link_libraries(ot-daemon PRIVATE -Wl,-Map=ot-daemon.map)
@@ -78,7 +78,7 @@ target_link_libraries(ot-ctl PRIVATE
 )
 
 if(OT_LINKER_MAP)
-    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "AppleClang")
+    if(APPLE)
         target_link_libraries(ot-ctl PRIVATE -Wl,-map,ot-ctl.map)
     else()
         target_link_libraries(ot-ctl PRIVATE -Wl,-Map=ot-ctl.map)