When I build dev-version of mesa 3d(graphics APIs) These warning messages are appearing with clang.
warning: unknown warning option '-Wno-format-truncation' [-Wunknown-warning-option] They have appeared after we have added this command to our autoconf file. AX_CHECK_COMPILE_FLAG([-Wformat-truncation], [CFLAGS="$CFLAGS -Wno-format-truncation"]) This command works correct with gcc and g++ but with clang and clang++ this flag is added though they don't support this flag. Does autoconf have full clang support or autoconf has well known workaround?. Link to autoconf file: https://gitlab.freedesktop.org/mesa/mesa/blob/master/configure.ac#L310
