error C4013: 'InitializeSRWLock' undefined; assuming extern returning int

[John E]

Firstly, I'm seeing this error when I try to compile a 3rd-party library. I see it with other function calls too - such as AcquireSRWLockExclusive() / TryAcquireSRWLockExclusive() / ReleaseSRWLockExclusive() and a few others. According to MSDN I should be able to fix this by #including <windows.h> or maybe <synchapi.h>

I've tried #including both - and yet I still get the error...

Secondly - this is VS2015 (Community Edition) but whenever I've compiled things in previous versions of MSVC, I've a feeling this was previously a warning. I've checked the project's Properties but warnings aren't set up to be treatable as errors. So might there be something in a header file somewhere which would over-ride the project setting (and thereby cause warnings to get treated as errors) ?

[2kaud]

Why the old VS2015 community and not the current VS2017 Community???

Do you have the macros WINVER and _WIN32_WINNT set correctly so that the compiler knows for what OS you are building?

See https://msdn.microsoft.com/en-us/library/6sehtctf.aspx

For user code, I've only seen C4013 as a level 3 warning - not as an error. I've only come across C4013 as an error when compiling drivers.

What and how are you compiling?

[John E]

Why the old VS2015 community and not the current VS2017 Community???

Do you have the macros WINVER and _WIN32_WINNT set correctly so that the compiler knows for what OS you are building?

[...]

What and how are you compiling?

Hi 2kaud - I'm building an open-source (cross-platform) library called Glib. Many years ago I'd previously built it with VS2005 (which built okay) and I'm now trying it on a machine which happens to have VS2015 installed.

You were right about _WIN32_WINNT. I'm building on Windows 7 so if I specifically set _WIN32_WINNT to 0x0601 the library now builds. However, I'm a bit puzzled... I can't find any other project where I've needed to set this myself. Have I just been lucky up to now?