Blame cpp-test/test-t/u_cplus.C

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/* u_cplus.C:   C++: #undef or #define __cplusplus causes undefined
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        behavior.   */
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/* { dg-do preprocess } */
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/* { dg-options "-std=c++98 -pedantic-errors" } */
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#undef  __cplusplus     /* { dg-error "undefining | shouldn't be undefined" } */
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