Does not compile with CLang 12

[TCH68k]

If i try to compile the project (0.7.0) with CLang 12 and it dies with a bunch of errors, printed in very a garbageish manner:

[ 23%] Building CXX object CMakeFiles/d2tm.dir/controls/cMouse.cpp.o
clangclangclangclangclangclang: : clang: : : : : errorerrorerror: error: : error: errorerror: : : optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]
optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]
optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]
optimization flag '-fno-fat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]

The dependencies only list the GCC version, not CLang; is it possible to compile it with CLang at all?