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[Tinycc-devel] C99 token pasting

From: Jay Foad
Subject: [Tinycc-devel] C99 token pasting
Date: Tue, 1 Apr 2014 10:22:55 +0100

C99 specifies the behaviour of token pasting when either (or both) of
the arguments to be pasted expand to an empty sequence of tokens. tcc
doesn't seem to implement this:

$ cat p.c
#define P(A,B) A ## B bob
#define Q(A,B) A ## B+
$ ./tcc -E p.c
# 2 "p.c"
p.c:3: warning: pasting "jim" and " " does not give a valid preprocessing token

jim bob

In the P() example, the warning is inappropriate.
In the Q() example, the result is wrong. We should get + and + as two
separate tokens, not the single token ++.


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