tensorpipe fails to build on FreeBSD: error: use of undeclared identifier 'getBootIDInternal'

[yurivict]

/usr/ports/math/dgl/work/dgl-1.0.2/third_party/tensorpipe/tensorpipe/common/system.cc:144:41: error: use of undeclared identifier 'getBootIDInternal'
  static optional<std::string> bootID = getBootIDInternal();
                                        ^
1 error generated.

The error occurred while trying to build the DGL library https://github.com/dmlc/dgl

[lw]

That's expected: we have an implementation of that function for Linux and MacOS, but not for FreeBSD:

tensorpipe/tensorpipe/common/system.cc

Lines 53 to 80 in bb1473a

	#ifdef __APPLE__
	optional<std::string> getBootIDInternal() {
	std::array<char, 128> buf;
	// See https://developer.apple.com/documentation/iokit/iokitlib_h for IOKitLib
	// API documentation.
	io_registry_entry_t ioRegistryRoot =
	IORegistryEntryFromPath(kIOMasterPortDefault, "IOService:/");
	CFStringRef uuidCf = (CFStringRef)IORegistryEntryCreateCFProperty(
	ioRegistryRoot, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0);
	IOObjectRelease(ioRegistryRoot);
	CFStringGetCString(uuidCf, buf.data(), buf.size(), kCFStringEncodingMacRoman);
	CFRelease(uuidCf);
	return std::string(buf.data());
	}
	#elif defined(__linux__)
	optional<std::string> getBootIDInternal() {
	std::ifstream f{"/proc/sys/kernel/random/boot_id"};
	if (!f.is_open()) {
	return nullopt;
	}
	std::string v;
	getline(f, v);
	f.close();
	return v;
	}

If you're familiar with FreeBSD feel free to submit a patch! However, FreeBSD isn't really supported or tested, so nothing guarantees that you won't find other issues after this one.