cmake/Modules/CheckVariableExists.c

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#ifdef CHECK_VARIABLE_EXISTS
extern int CHECK_VARIABLE_EXISTS;
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# ifdef __CLASSIC_C__
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int main()
{
int ac;
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char* av[];
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# else
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int main(int ac, char* av[])
{
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# endif
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if (ac > 1000) {
return *av[0];
}
return CHECK_VARIABLE_EXISTS;
}
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#else /* CHECK_VARIABLE_EXISTS */
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# error "CHECK_VARIABLE_EXISTS has to specify the variable"
#endif /* CHECK_VARIABLE_EXISTS */