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Bug 1079

Summary: Bad practice w/errno causes compilation issue
Product: Eigen Reporter: Stephen Dunn <dunn.stephen>
Component: Core - generalAssignee: Nobody <eigen.nobody>
Status: NEW ---    
Severity: Compilation Problem CC: chtz, gael.guennebaud, jacob.benoit.1
Priority: Normal    
Version: 3.2   
Hardware: All   
OS: Windows   
Whiteboard:

Description Stephen Dunn 2015-10-08 19:20:32 UTC
Best-practice guidelines for Windows Socket Servers (according to the MSDN) is to use the following:

#define errno WSAGetLastError()

For direct-mapping to Unix-style socket errors for compatibility in IPv4 servers. However, this conflicts with line 167 in Memory.h:

 166:   #ifdef EIGEN_HAS_ERRNO
 167:   errno = ENOMEM; // according to the standard
 168:   #endif

Which results in a compile error. It is not safe to assume errno is a primitive value type.
Comment 1 Gael Guennebaud 2015-10-09 08:18:30 UTC
hm, this contradicts the C++ standard: http://en.cppreference.com/w/cpp/error/errno

I'm also a bit confuse, do you mean that you defined "#define errno WSAGetLastError()" in your own code and that WSAGetLastError() does not return a writable reference, or that is how errno is defined by <cerrno>, or that errno is not defined at all???
Comment 2 Nobody 2019-12-04 15:00:32 UTC
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