Partial support for self-referencial macros #146
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It's not perfect, since this code expands to A(1 + 1 + x) # define x 1 + x # define A(a1) B(a1) # define B(a1) A(a1) A(x)
Adding `// expect_failure` in a test source file will allow the golden file to not match.
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Upon reviewing the changes to the token pasting code, I realized that pasted tokens already pass through the "is this a macro" check, and so the changes in d4f87ce were unnecessary.
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Context
TCC uses self-referential macros. This PR extends pnut's expansion phase to prevent the infinite expansion of self-referential macros. It also adds a few debugging features:
#includewhen the file cannot be found or read.