Ignore unknown pragmas during lexing - #597
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Currently, the parser accepts `#pragma` directives that occur in declaration position. Elab ignores (with a warning) pragmas that are not global declarations. C2C ignores (with a warning) all remaining pragmas except the `section`, `use_section` and `reserve_register` pragmas handled in cfrontend/CPragmas.ml. However, `#pragma` directives can occur anywhere in a C source file, incl. in the middle of a statement or an expression. Some system header files includes such weird pragmas. This PR recognizes `#pragma` directives that are not handled in cfrontend/CPragmas.ml during lexical analysis and ignores them (with a warning). No `PRAGMA` token is generated for unhandled pragmas. This way, unhandled pragmas can occur anywhere in the source file and will not cause parsing errors. Co-authored-by: Bernhard Schommer <bernhardschommer@gmail.com>
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Currently, the parser accepts
#pragmadirectives that occur in declaration position. Elab ignores (with a warning) pragmas that are not global declarations. C2C ignores (with a warning) all remaining pragmas except thesection,use_sectionandreserve_registerpragmas handled in cfrontend/CPragmas.ml.However,
#pragmadirectives can occur anywhere in a C source file, incl. in the middle of a statement or an expression. Some system header files includes such weird pragmas.This PR recognizes
#pragmadirectives that are not handled in cfrontend/CPragmas.ml during lexical analysis and ignores them (with a warning). NoPRAGMAtoken is generated for unhandled pragmas. This way, unhandled pragmas can occur anywhere in the source file and will not cause parsing errors.