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[Bug preprocessor/64864] [5 Regression] preprocessor linemarkers break configure checks


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64864

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The line markers allows the compiler to properly distinguish between what
tokens come from where, e.g. system headers vs. normal headers (should we warn
about issues in there if -Wsystem-headers is not used and it is some warning
not enabled by default in system headers), or e.g. for #pragma GCC diagnostics
tracking.


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