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Subject: Re: [9front] pcc macro issue
Reply-To: 9front@9front.org
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Quoth Xiao-Yong Jin <meta.jxy@gmail.com>:
> The following is wrong.
> 
> cpu% cat test.c
> #define N
> #define F(x)
> #define M F(N)
> M
> cpu% pcc -E test.c
> cpp: test.c:4 Disagreement in number of macro arguments
> #line 1 "/tmp/test.c"
> 
> 
> 
>  F()
> pcc: cpp: cpp 25337: errors
> 

Yep, I fixed a lot of problems in cpp, but this
is one that I didn't get to. Another one is
space handling, which we currently ignore.

	#define MAC(x) y

	MAC(x)	// should expand to y
	MAC (x)	// should remain untouched

ANSI C macro expansion rules are subtle and
arcane. I've got a few tests in my underwhelming
regression suite, which may help if you want
to take a stab at this:

http://shithub.us/git/ori/regress/HEAD/cmd/cpp/f.html