Alessandro Bonazzi
e075990ed3
Files correlati : Commento : Aggiunto il preprocessore c++ mcpp per sostituire il compilatore nella compilazione delle maschere.
35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
/*
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* unspcs.c:
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* 1998/08 kmatsui
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*
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* These texts are unportable ones, because the order of the evaluation is
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* unspecified. Good preprocessor will warn at these texts even if the
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* results are valid. Good preprocessor will also document the order of
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* evaluation and the behavior on invalid results.
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* Note: Order of evaluation of sub-expressions (other than operands of &&,
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* ||, ? :) of #if expression is also unspecified. The order, however, never
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* affects the result, because #if expression never cause side effect, so no
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* warning is necessary. Precedence and grouping rules of operators are other
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* things than order of evaluation, and shall be obeyed by preprocessor.
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*
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* 2003/03 Rewritten for testsuite. kmatsui
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*/
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/* { dg-do preprocess } */
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/* { dg-options "-ansi -pedantic -Wall" } */
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#define str( a) # a
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#define xstr( a) str( a)
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/* s.1.1: Order of evaluation of #, ## operators. */
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#define MAKWIDESTR( s) L ## # s /* { dg-warning "Macro with mixing of ## and # operators isn't portable" } */
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/* Either of L"name"; or L# name; ("L#" is not a valid pp-token). */
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MAKWIDESTR( name);
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/* s.1.2: Order of evaluation of ## operators. */
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#define glue3( a, b, c) a ## b ## c /* { dg-warning "Macro with multiple ## operators isn't portable" } */
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/* "1.a" or undefined, since .a is not a valid pp-token, while 1. and 1.a are
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valid pp-tokens. */
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xstr( glue3( 1, ., a));
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