Won't use Werror on GCC12

Author: stephenberry

tests/CMakeLists.txt

@@ -23,7 +23,13 @@ target_compile_features(glz_test_common INTERFACE cxx_std_23)
 target_link_libraries(glz_test_common INTERFACE ut::ut glaze::glaze)
 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
     target_compile_options(glz_test_common INTERFACE -fno-exceptions -fno-rtti)
-    if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+    if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+        if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 12)
+            target_compile_options(glz_test_common INTERFACE -Wall -Wextra -pedantic $<$<CONFIG:Debug>:-Werror>)
+        else()
+            target_compile_options(glz_test_common INTERFACE -Wall -Wextra -pedantic)
+        endif()
+    elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         target_compile_options(glz_test_common INTERFACE -Wall -Wextra -pedantic $<$<CONFIG:Debug>:-Werror>)
     else()
         target_compile_options(glz_test_common INTERFACE -Wall -Wextra -pedantic)