[PATCH] D96464: [flang] Don't perform macro replacement unless *.F, *.F90, &c.

[Peter Klausler via Phabricator via llvm-commits]

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Avoid spurious and confusing macro replacements from things like
-DPIC on Fortran source files whose suffixes indicate that preprocessing
is not expected.

Add gfortran-like "-cpp" and "-nocpp" flags to f18 to force predefinition
of macros independent of the source file suffix.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96464

Files:
  flang/lib/Parser/parsing.cpp
  flang/lib/Parser/preprocessor.cpp
  flang/lib/Parser/preprocessor.h
  flang/tools/f18/f18.cpp

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