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

[Peter Klausler via Phabricator via llvm-commits]

klausler added a comment.

The behavior of a preprocessor is always present, even with "-nocpp"; preprocessing is an integrated part of prescanning, not a separate pass or process.  The preprocessor instances used to be unconditionally initialized with some macro definitions from -D options and built-in names like __FILE__; those initializations are now conditional, so that unexpected macro replacement will not occur.  The motivation for this change is from an application that defined -DPIC on the command line and had a variable named PIC in a *.f90 file.

The list of file suffixes that will observe predefined macros in f18 is probably incomplete; I don't know what to do with *.ff files, for example.  I would not view it as being authoritative if I were you.


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  https://reviews.llvm.org/D96464/new/

https://reviews.llvm.org/D96464