ZeroTierOne/ext/libpqxx-7.7.3/config-tests/strerror_r.cxx

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// Check for strerror_r.
// It can be either the POSIX version (which returns int) or the GNU version
// (which returns char *).
#include <cstring>
#include <type_traits>
int main()
{
char buffer[200];
auto res{strerror_r(1, buffer, 200)};
// Sidestep type differences. We don't really care what the value is.
return not not res;
}