https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120421
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Harald van Dijk from comment #3) > For diagnostics, this is not an exact duplicate, this can be addressed while > keeping the column information that is generated today. Here's what Clang > does for this same test: > > $ clang++ -c a.cc > a.cc:7:6: error: use of undeclared identifier 'xxxxx' > 7 | fcn(xxxxx); // comment > | ^ > 1 error generated. > $ clang++ -c a.cc -save-temps > a.cc:7:14: error: use of undeclared identifier 'xxxxx' > 7 | longNamefcn(xxxxx); > | ^ > 1 error generated. > > That is, although Clang has the same issue that the source column > information is completely lost, the column information is that from the > preprocessed output, it still manages to generate a good diagnostic by > printing the preprocessed line instead. But printing out the preprocessed line is equally as wrong in many cases. Especially when it comes to `#line` markers. That is it is there is no correct answer and clang can be shown to be broken too in some cases too.
