[Bug c++/71517] g++ gives different warnings if compiling a file directly or adding preprocess step

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71517

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Preprocessing loses macro invocation context information, so such differences
are expected (use -Wsystem-headers if you want to see warnings regardless if
something comes from system headers or not, or better preprocess just with -E
-fdirectives-only so that such information is not lost).