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__STDC__ |
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In normal operation, this macro expands to the constant 1, to signify
that this compiler conforms to ISO Standard C. If GNU CPP is used with
a compiler other than GCC, this is not necessarily true; however, the
preprocessor always conforms to the standard unless the
'-traditional-cpp' option is used.
This macro is not defined if the '-traditional-cpp' option is used.