Don't warn about ##__VA_ARGS__ when using clang

p4lang · Feb 15, 2023 · da5b506 · da5b506
1 parent 7783291
commit da5b506
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -217,6 +217,12 @@ add_cxx_compiler_option ("-Wno-deprecated-declarations")
 # or in future versions of GCC.
 add_cxx_compiler_option ("-pedantic")
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  # The ##__VA_ARGS__ GNU extension is needed for IR. But clang compains about it.
+  # FIXME: with C++20 we would be able to use standard __VA_OPT__
+  add_cxx_compiler_option ("-Wno-gnu-zero-variadic-macro-arguments")
+endif()
+
 if (ENABLE_SANITIZERS)
   append("-fsanitize=undefined,address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
 endif ()