Build Error on OpenBSD: cannot static_cast<pid_t>(pthread_self())

Describe the issue

reinterpret_cast<pid_t>(pthread_self()) in this line:
https://github.com/abseil/abseil-cpp/blob/master/absl/base/internal/sysinfo.cc#L470
...would silence the error but I'm not sure what the actual correct fix is.

I came across this problem when trying to build and install grpc which relies on abseil. I attempted installing grpc via ruby with:

gem32 install grpc

I'm on the latest version of openbsd at the time of writing (7.4)

Steps to reproduce the problem

# install OpenBSD 7.4 first, the enter in the terminal:
su
# input super user password
pkg_add ruby
gem32 install grpc
# now you will see a abseil build error on the given line of code and in the specified file in this ticket, with the exact error message

### What version of Abseil are you using?

The version shipped with grpc installed from gem32 in openbsd 7.4 (try the reproduce steps to see what I mean)

### What operating system and version are you using?

OpenBSD 7.4

### What compiler and version are you using?

Not sure how to check, whatever ruby is using with gem32

### What build system are you using?

gem32 (ruby)

### Additional context

_No response_

I think this is already fixed, you probably have an old version. The OpenBSD case is here:

abseil-cpp/absl/base/internal/sysinfo.cc

Lines 447 to 449 in c79e6b3

    
           #elif defined(__OpenBSD__) 
        
           pid_t GetTID() { return getthrid(); }

The abseil version provided by ruby's gem install command is indeed outdated.

Thanks for the information. Hoping they update to a new enough version soon to get this working.

	#elif defined(__OpenBSD__)

	pid_t GetTID() { return getthrid(); }