[Issue]: CXX_EXTENSIONS OFF set but GNU extensions are used

[LunNova]

The CXX_EXTENSIONS property is set to off in multiple CMake files in clr, but non-standard features are used so this property should be enabled.

Most compilers silently allow extensions unless -Wpedantic or specific warnings for extensions are enabled so there's no warning by default. Adding -Wpedantic or specific warnings like Wgnu-zero-variadic-macro-arguments to CXXFLAGS finds multiple places relying on extensions.

/build/source/rocclr/utils/debug.hpp:196:64: error: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Werror,-Wgnu-zero-variadic-macro-arguments]
  196 |           amd::log_printf(      hipMemcpyHtoA
level, __FILENAME__, __LINE__, format, ##__VA_ARGS__);                   \
      |                                                       
/build/source/rocclr/platform/memory.hpp:204:5: error: anonymous structs are a GNU extension [-Werror,-Wgnu-anonymous-struct]
  204 |     struct {
      |     ^
/build/source/rocclr/platform/memory.hpp:204:5: error: anonymous types declared in an anonymous union are an extension [-Werror,-Wnested-anon-types]

[ppanchad-amd]

Hi @LunNova. Internal ticket has been created to investigate your issue. Thanks!