Quick C program to detect if standard C threads are supported by checking the `__STDC_NO_THREADS__` macro

isthreads.c

#include <stdio.h>

int main (int argc, char *argv[])
{
    // Get the compiler name and version, where easily obtained, for a more
    // informative output
    char *compilerName;
    char *compilerVersion;
#if defined(__clang__)
    compilerName = "Clang/LLVM";
    compilerVersion = __VERSION__;
#elif defined(__ICC) || defined(__INTEL_COMPILER)
    compilerName = "Intel ICC/ICPC";
    compilerVersion = __VERSION__;
#elif defined(__GNUC__) || defined(__GNUG__)
    compilerName = "GNU GCC/G++";
    compilerVersion = __VERSION__;
#elif defined(__HP_cc) || defined(__HP_aCC)
    compilerName = "HP C/aC++";
#elif defined(__IBMCC__) || defined(__IBMCPP__)
    compilerName = "IBM XL C/C++";
    compilerVersion = __xlc__;
#elif defined(_MSC_VER)
    compilerName = "MS Visual Studio";
#elif defined(__PGI)
    compilerName = "Portland Group PGCC/PGCPP";
#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
    compilerName = "Oracle Solaris Studio";
#endif

    printf("Threads are %ssupported", __STDC_NO_THREADS__ ? "not " : "");
    printf(" in C standard %ld", __STDC_VERSION__);
    if (compilerName)
        printf(" on %s", compilerName);
    if (compilerVersion)
        printf(" %s", compilerVersion);
    printf("\n");
    return 0;
}