On Wed, Oct 21, 2020 at 06:21:06PM -0700, Nick Desaulniers wrote: > DWARF5 is the latest standard of the DWARF debug info format. > > Feature detection of DWARF5 is onerous, especially given that we've > removed $(AS), so we must query $(CC) for DWARF5 assembler directive > support. Further -gdwarf-X where X is an unsupported value doesn't > produce an error in $(CC). GNU `as` only recently gained support for > specifying -gdwarf-5. Do you have more details here? On godbolt.org, gcc does report an error for unsupported dwarf versions. https://godbolt.org/z/G35798 gcc does not seem to pass the -gdwarf-* options to the assembler when compiling C source. For assembler, gcc will pass an appropriate option depending on the version of binutils it was configured with: if the assembler doesn't support dwarf-5 it can call it with --gdwarf2 for eg. If the user is using a properly configured toolchain it doesn't look like it should be an issue to just use cc-option?
