apacheGH-45325: [C++] Improved error message when using clang++ witho…

…ut clang
WillAyd · Jan 21, 2025 · dd6538b · dd6538b
1 parent 984519d
commit dd6538b
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/cpp/cmake_modules/SetupCxxFlags.cmake b/cpp/cmake_modules/SetupCxxFlags.cmake
@@ -23,6 +23,23 @@ include(CheckCXXSourceCompiles)
 
 message(STATUS "System processor: ${CMAKE_SYSTEM_PROCESSOR}")
 
+if(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
+  set(UsingClang TRUE)
+else()
+  set(UsingClang FALSE)
+endif()
+
+# Check for Clang C++ compiler
+if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  set(UsingClangPlusPlus TRUE)
+else()
+  set(UsingClangPlusPlus FALSE)
+endif()
+
+if(${UsingClangPlusPlus} AND NOT ${UsingClang})
+  message(FATAL_ERROR "When using clang++ you must also use clang")
+endif()
+
 if(NOT DEFINED ARROW_CPU_FLAG)
   if(CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
     set(ARROW_CPU_FLAG "emscripten")