rsmith added inline comments.
================
Comment at: lib/Driver/ToolChains/Clang.cpp:3973
Args.AddLastArg(CmdArgs, options::OPT_fheinous_gnu_extensions);
+ Args.AddLastArg(CmdArgs, options::OPT_fdigraphs, options::OPT_fno_digraphs);
Args.AddLastArg(CmdArgs, options::OPT_fno_operator_names);
----------------
Use `Args.hasFlag` to determine if `-fdigraphs` or `-fno-digraphs` was
specified last, then `CmdArgs.push_back("-fno-digraphs")` if digraphs are
disabled. (There are lots of examples of that in this file that you can follow.)
What should `-fdigraphs` do under `-std=c89`? I think produing a "this flag is
not compatible with that flag" diagnostic would make sense for that case.
Repository:
rC Clang
https://reviews.llvm.org/D48266
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