CMake/Modules/CheckVariableExists.c

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#ifdef CHECK_VARIABLE_EXISTS
extern int CHECK_VARIABLE_EXISTS;
int main()
{
int* p;
p = &CHECK_VARIABLE_EXISTS;
return 0;
}
#else /* CHECK_VARIABLE_EXISTS */
# error "CHECK_VARIABLE_EXISTS has to specify the variable"
#endif /* CHECK_VARIABLE_EXISTS */