nanonng 0.21.9 build issue with MinGW-w64 MSVCRT

[brechtsanders]

When building nanonng version 0.21.9 for Windows with an MSVCRT MinGW-w64 toolchain the build fails in src/platform/windows/win_clock.c because timespec_get() is not defined (it does exist in UCRT MinGW-w64).

The solution is to modify nni_time_get() in src/platform/windows/win_clock.c to only use the timespec_get() implementation when building against UCRT (using #ifdef _UCRT) and otherwise fall back to another implementation, for example the same fallback based in gettimeofday() used in src/platform/posix/posix_clock.c.

On a side note, the line int rv; in nni_time_get() in src/platform/windows/win_clock.c is unused.

I was able to build when after modifying nni_time_get() in src/platform/windows/win_clock.c as follows:

int
nni_time_get(uint64_t *seconds, uint32_t *nanoseconds)
{
#ifdef _UCRT
	struct timespec ts;
	if (timespec_get(&ts, TIME_UTC) == TIME_UTC) {
		*seconds     = ts.tv_sec;
		*nanoseconds = ts.tv_nsec;
		return (0);
	}
	return (nni_win_error(GetLastError()));
#else
	int rv;
	struct timeval tv;
	if ((rv = gettimeofday(&tv, NULL)) == 0) {
		*seconds     = tv.tv_sec;
		*nanoseconds = tv.tv_usec * 1000;
		return (0);
	}
	return (nni_plat_errno(errno));
#endif
}

Note that I haven't tested it yet, and maybe there is a better way (with a more granular clock) to do this.

[JaylinYu]

thats why i labled it as a pre-release, you know. Will discuss with Garrett on it.

[JaylinYu]

related to nanomsg/nng#1826
you can try port the code if you have your own fork... seems like garrett not being happy with MinGW

[brechtsanders]

Sorry to hear that.

I'm offering the solution on a plate here . If it doesn't get incorporated I guess will just keep patching my builds.

Just trying to help - as an open source developer.

[JaylinYu]

Sorry to hear that.

I'm offering the solution on a plate here . If it doesn't get incorporated I guess will just keep patching my builds.

Just trying to help - as an open source developer.

But we definitely could figure it out in NanoNNG fork.

[JaylinYu]

Tried with your way works.
Tried without your way, also works.

I am using Win10 with MinGW

[brechtsanders]

@JaylinYu The issue is specifically with MSVCRT toolchain, if you're using UCRT the issue will not happen.