Fix clang build on macOS

joedrago · Nov 2, 2020 · f3af3d1 · f3af3d1
1 parent b8e36eb
commit f3af3d1
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -85,6 +85,12 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     -Wno-switch-enum
     -Wno-undef
   )
+  # The detection of cross compilation by -Wpoison-system-directories has false positives on macOS because
+  # --sysroot is implicitly added. Turn the warning off.
+  check_c_compiler_flag(-Wpoison-system-directories HAVE_POISON_SYSTEM_DIRECTORIES_WARNING)
+  if(HAVE_POISON_SYSTEM_DIRECTORIES_WARNING)
+      add_definitions(-Wno-poison-system-directories)
+  endif()
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
   add_definitions(-std=c99) # Enforce C99 for gcc
   MESSAGE(STATUS "Enabling warnings (for colorist lib/bin) for GCC")