CompileFlags:
  # Named here rather than in the editor's settings because nothing vendors
  # this repo: the one build tree is the one an editor should read.
  CompilationDatabase: build/atmega328p-generated
  Add:
    # clang has no 24-bit integer and GCC's are keywords, not macros, so the
    # editor needs a stand-in for avr::uint24_t. The next width up is the only
    # one available — clang rejects _BitInt(24) on this target.
    - -D__uint24=unsigned long
    - -D__int24=long
    # clangd forwards the driver's system includes but not its own header
    # directory, so <stdint.h> resolves to avr-libc's, which still gates the
    # limit and constant macros on the C++98 opt-in.
    - -D__STDC_LIMIT_MACROS
    - -D__STDC_CONSTANT_MACROS
    # isr::emit spells a vector number into [[gnu::signal(N)]], which clang
    # rejects rather than ignores — enough of them in one TU to reach the
    # default limit of 19 inside the headers and truncate the parse.
    - -ferror-limit=0
  Remove:
    # The build promotes warnings for the compiler that has to be right about
    # them; in the editor the flag paints a second frontend's opinions in the
    # colour reserved for things that do not compile.
    - -Werror
Diagnostics:
  Suppress:
    # clang's AVR `signal` attribute takes no arguments and it knows none of
    # progmem, naked or OS_main. A misspelling is what the build is for.
    - attribute_wrong_number_arguments
    - unknown-attributes