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131
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1 /* Copyright (C) 2000-2017 Free Software Foundation, Inc. */
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2
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3 /* { dg-do preprocess } */
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4 /* { dg-options "-pedantic -std=c99" } */
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5
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6 /* Tests macro syntax, for both definition and invocation, including:-
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7
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8 o Full range of macro definition semantics.
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9 o No. of arguments supplied to function-like macros.
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10 o Odd GNU rest args behavior.
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11 o Macro arguments do not flow into the rest of the file. */
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12
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13
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14 /* Test basic macro definition syntax. The macros are all called
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15 "foo" deliberately to provoke an (excess) redefinition warning in
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16 case the macros succeed in being entered in the macro hash table
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17 despite being an error.
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18
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19 Split a couple of the lines to check that the errors appear on the
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20 right line (i.e. are associated with the correct token). */
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21
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22 #define ; /* { dg-error "identifier" } */
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23 #define SEMI; /* { dg-warning "space" } */
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24 #define foo(X /* { dg-error "expected" } */
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25 #define foo\
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26 (X,) /* { dg-error "parameter name" } */
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27 #define foo(, X) /* { dg-error "parameter name" } */
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28 #define foo(X, X) /* { dg-error "duplicate" } */
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29 #define foo(X Y) /* { dg-error "expected" } */
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30 #define foo(() /* { dg-error "parameter name" } */
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31 #define foo(..., X) /* { dg-error "expected" } */
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32 #define foo \
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33 __VA_ARGS__ /* { dg-warning "__VA_ARGS__" } */
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34 #define goo(__VA_ARGS__) /* { dg-warning "__VA_ARGS__" } */
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35 #define hoo(...) __VA_ARGS__ /* OK. */
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36 #define __VA_ARGS__ /* { dg-warning "__VA_ARGS__" } */
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37 __VA_ARGS__ /* { dg-warning "__VA_ARGS__" } */
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38
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39 /* test # of supplied arguments. */
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40 #define none()
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41 #define one(x)
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42 #define two(x, y)
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43 #define var0(...)
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44 #define var1(x, ...)
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45 none() /* OK. */
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46 none(ichi) /* { dg-error "passed 1" } */
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47 one() /* OK. */
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48 one(ichi) /* OK. */
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49 one(ichi\
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50 , ni) /* { dg-error "passed 2" } */
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51 two(ichi) /* { dg-error "requires 2" } */
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52 var0() /* OK. */
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53 var0(ichi) /* OK. */
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54 var1() /* { dg-warning "requires at least one" } */
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55 var1(ichi) /* { dg-warning "requires at least one" } */
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56 var1(ichi, ni) /* OK. */
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57
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58 /* This tests two oddities of GNU rest args - omitting a comma is OK,
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59 and backtracking a token on pasting an empty rest args. */
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60 #define rest(x, y...) x ## y /* { dg-warning "ISO C" } */
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61 rest(ichi,) /* OK. */
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62 rest(ichi) /* { dg-warning "requires at least one" } */
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63 #if 23 != rest(2, 3) /* OK, no warning. */
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64 #error 23 != 23 !!
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65 #endif
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66
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67 /* Test that we don't allow arguments to flow into the rest of the
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68 file. */
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69 #define half_invocation do_nowt(2
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70 #define do_nowt(x) x
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71 half_invocation ) /* OK. */
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72 do_nowt (half_invocation)) /* { dg-error "unterminated argument" } */
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