PCH generation process breaks programs that rely on compile_commands.json
When a precompiled header is used, CMake creates 2 files for it: cmake_pch.cxx and cmake_pch.hxx. When compiler is run, it creates .pch file by including .hxx file from command line and compiling empty .cxx file. But this behavior breaks programs that use compile_commands.json for preprocessing files from build. When Clang compiler is used, the file included with -include-pch flag is preprocessed by extracting original filename from .pch - in this case, .cxx file will be incorrectly used. All include information from pch generation step is lost. Preprocessed file is corrupted because of that.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information