328b826e8a
Arg substitution leaves placeholder marker in the stream for empty arguments. Those need to be skipped when searching for a fnlike macro invocation in the replacement list itself. See testcase.
15 lines
622 B
C
15 lines
622 B
C
#define M_RETI_ARG27(x,y,z,aa, ...) aa
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#define M_RET_ARG27(...) M_RETI_ARG27(__VA_ARGS__)
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#define M_COMMA_P(...) M_RET_ARG27(__VA_ARGS__, 1, 1, 0, useless)
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#define M_EMPTYI_DETECT(...) 0, 1,
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#define M_EMPTYI_P_C1(...) M_COMMA_P(M_EMPTYI_DETECT __VA_ARGS__ () )
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#define EX
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#define empty(x)
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#define fnlike(x) yeah x
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/* If the following macro is called with empty arg (X183), the use
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of 'x' between fnlike and '(' doesn't hinder the recognition of this
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being a further fnlike macro invocation. */
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#define usefnlike(x) fnlike x (x)
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X181 M_EMPTYI_P_C1()
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X182 M_EMPTYI_P_C1(x)
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X183 usefnlike()
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