Solution: socket_base_t::in_event cannot do anything useful with
return status of process_commands. Asserting is the wrong solution,
as it is entirely valid to be interrupted or for the context to be
terminated, so discard the value.

Solution: use NULL instead to avoid build failure with older
compilers.

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize to -1, since fd is a file descriptor (int).

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize class variable in the same order as they are
defined.

Solution: initialize class variable in the same order as they are
defined.

Solution: don't store it in zmq::poller_base_t::adjust_load, as the
build with Werror=unused=variable will fail otherwise.

Solution: remove statc initialization to NULL of thread.hpp pthread_t
descriptor. There is no portable way to statically initialize a
pthread_t variable.

Solution: initialise it inside an ifdef too

Solution: fix it

Problem: Several problems found by Coverity Static Analyzer

Solution: The Coverity Static Code Analyzer was used on libzmq code and found
many issues with uninitialized member variables, some redefinition of variables
hidding previous instances of same variable name and a couple of functions
where return values were not checked, even though all other occurrences were
checked (e.g. init_size() return).

Problem: Visual Studio Toolset was incorrectly set in VCXPROJ files

Solution: Corrected Toolset setting where needed and inprove compilation speed
by adding defintion of WIN32_LEAN_AND_MEAN prior to any Windows specific
include files, which skips non-essential definitions during compilation.

Bump C/C++ standard version support to C11/C++11

Solution: remove it

Solution: bump to C++11 and C11 in autoconf

Solution: use CheckCXXCompilerFlag to check for support for
-std=gnu++11

Solution: import macros to check for compiler options from
autoconf-archive into the m4 subdir.

Precompiled

Problem: tweetnacl gives many warnings on MSVC

Solution: disable the warnings on this file only

We use pragmas wrapped in compiler conditionals. This will need
extending to non-gcc/msvc compilers. We could also fix the warnings
in the code, though I suspect it's not really possible.

Solution: Phase II - made compile using precompiled header

Solution: Phase I - make precompiled.hpp be first file included in every source file

Problem: VC++ gives warnings on inet_addr

Solution: in project.gyp, define _WINSOCK_DEPRECATED_NO_WARNINGS

Deprecate zmq_utils.h

instead of removing it, which breaks downstream builds.

problem: dynamic cast is causing issue when compiling for nodejs

Problem:  Windows build script requires edit for DevStudio version

Solution: Use CMD.EXE environment variable to extract DevStudio version
number and build using it. This even supports machines with multiple
DevStudio versions installed, as long as the build for each version is
done on a separate window with the correct environment.
If multiple version builds are desired from a single CMD.EXE, edit the
buildall.bat file to uncomment the build statements for each specific
version desired.

Number of fixes for gyp builds