Sfinktah cygwin readme

[sfinktah]

Added instructions for compiling under cygwin.

Any chance of a pre-compiled wheel for Windows?

[mwilliamson]

If I remember correctly, jq doesn't compile on native Windows. Presumably a Windows wheel that used cygwin to compile jq would end up dragging in cygwin as well?

[sfinktah]

If I remember correctly, jq doesn't compile on native Windows. Presumably a Windows wheel that used cygwin to compile jq would end up dragging in cygwin as well?

Firstly, I shouldn't have even connected cygwin and windows... jq compiles wonderfully under cygwin, works great, and you should approve the PR to the readme, just so others can use it.

I would advocate for a cygwin wheel, but I have since read your comments about the short falling of the CI environment as they pertain to windows, so that would rely on cross-compiling a cygwin binary from linux -- which is not impossible https://askubuntu.com/questions/110534/how-can-i-use-cygwin-under-ubuntu/1291347#1291347 -- but yeah... effort.

As to the dreaded question of a Windows wheel (and I apologise for not research before mentioning it), I did attempt to build a Windows wheel via cygwin and mingw, and it looked like it was going to work, but ended with:

*** Warning: This system cannot link to static lib archive /cygdrive/e/git/jq.py/_deps/build/onig-install-6.9.4/lib/libonig.la.
*** I have the capability to make that library automatically link in when
*** you link to this library.  But I can only do this if you have a
*** shared version of the library, which you do not appear to have.

That might be solved by some more liberal applications of -static -static-libgcc to various Makefiles.