Alessandro Bonazzi
e075990ed3
Files correlati : Commento : Aggiunto il preprocessore c++ mcpp per sostituire il compilatore nella compilazione delle maschere.
37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
/* u_1_24.c: Undefined behaviors on empty argument of macro call. */
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/* { dg-do preprocess } */
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/* { dg-options "-ansi -pedantic -Wall" } */
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/* u.1.24: Empty argument of macro call. */
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/*
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* Note: Since no argument and one empty argument cannot be distinguished
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* syntactically, additional dummy argument may be necessary for an
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* intermediate macro to process one empty argument (if possible).
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*/
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#define ARG( a, dummy) # a
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#define EMPTY
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#define SHOWN( n) printf( "%s : %d\n", # n, n)
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#define SHOWS( s) printf( "%s : %s\n", # s, ARG( s, dummy))
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#define add( a, b) (a + b)
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#define sub( a, b) (a - b)
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#define math( op, a, b) op( a, b)
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#define APPEND( a, b) a ## b
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/* printf( "%s : %d\n", "math( sub, , y)", ( - y));
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or other undefined behavior. */
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SHOWN( math( sub, , y)); /* { dg-warning "(e|E)mpty argument" } */
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/* printf( "%s : %s\n", "EMPTY", "");
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or other undefined behavior. */
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SHOWS( EMPTY); /* { dg-warning "(e|E)mpty argument" } */
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/* printf( "%s : %s\n", "APPEND( CON, 1)", "CON1"); */
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SHOWS( APPEND( CON, 1));
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/* printf( "%s : %s\n", "APPEND( , )", "");
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or other undefined behavior. */
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SHOWS( APPEND( , )); /* { dg-warning "(e|E)mpty argument" } */
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