Windows support

[daurnimator]

I had a go at this tonight on a branch over here: https://github.com/daurnimator/luaossl/tree/windows-support.

With 568a076 if you comment out the lines in _openssl.c that use inet_pton and inet_ntop then I could cross compile with:

x86_64-w64-mingw32-gcc -O2 -fPIC -Wall -Wextra -Wno-missing-field-initializers -c src/openssl.c -o src/openssl.o -D_REENTRANT -D_THREAD_SAFE -DLUA_COMPAT_APIINTCASTS -D_WIN32_WINNT=0x0600
x86_64-w64-mingw32-gcc -shared -o _openssl.dll src/openssl.o -lssl -lcrypto -lpthread -lm -llua

The resulting dll seems to work, and the basic examples work (only tested in wine though).

[greatwolf]

Are there any plans to merge the latest changes from master into the windows branch? It's behind quite a few. Also any plan to PR merge windows support back to upstream?

[daurnimator]

Are there any plans to merge the latest changes from master into the windows branch? It's behind quite a few.

It should be a conflict+issue free merge.
I tend to dislike pulling master into branches unless there is complex conflict.

Ideally it gets merged, things that need to be done before then:

• Decide if we are okay with the EXPORT decoration: if not, need to write a linker script/.lib
• Test on an actual windows machine (not wine)
• Add support to build system
• Figure out inet_pton/inet_ntop: windows has them (since vista), but mingw seems to not expose them
• Possibly discard the gathering entropy from uname/pid, etc instead of turning off for windows. I'm actually not sure what path windows will take for the random stirring functionality: we might need something windows specific.

[moteus]

Figure out inet_pton/inet_ntop: windows has them (since vista), but mingw seems to not expose them

This is related issues luarocks/luarocks#655

[daurnimator]

I've pushed updates to my windows-support branch. Please test to see if you can compile with MSVC.
It also depends on #92

[moteus]

I took quick look on code. It broken in some cases. Also it can be done with less changes.
I already has compiled version for MSVC 2015 which pass regress tests. But i do not have time to make pr today. Also may be I update it with some your changes.

[daurnimator]

I had another go at this tonight. Still not there yet, but getting closer. I've updated my master...daurnimator:windows-support branch

[daurnimator]

PR is up for review: #102