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From: "lhyatt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/66290] wrong location for -Wunused-macros
Date: Tue, 12 Jul 2022 13:40:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66290

--- Comment #4 from Lewis Hyatt <lhyatt at gcc dot gnu.org> ---
OK, I understand now why done_lexing is necessary, plenty of places call ba=
ck
into libcpp after lexing, e.g. to interpret strings, and this may generate
warnings.
I think that one line patch is the way to go then.

diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index b9f01a65ed7..25a3c50de8e 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -1283,6 +1283,7 @@ c_common_finish (void)

   /* For performance, avoid tearing down cpplib's internal structures
      with cpp_destroy ().  */
+  done_lexing =3D false;
   cpp_finish (parse_in, deps_stream);

   if (deps_stream && deps_stream !=3D out_stream && deps_stream !=3D stdou=
t=