Add support for libsqlite3 on z/OS

[dustin-ward]

Allows the use of the libsqlite3 tag on z/OS

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.16%. Comparing base (18cdded) to head (70dbb21).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1239   +/-   ##
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  Coverage   47.16%   47.16%           
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  Files          12       12           
  Lines        1533     1533           
=======================================
  Hits          723      723           
  Misses        669      669           
  Partials      141      141           

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[dustin-ward]

Looks like an unrelated test failure

[mattn]

yeah, merging. Thank you

[Benjamin-Barda]

HI @dustin-ward

Did you manage to make it work on zos ? I have been banging my head for 3 weeks straight trying to make this work. Knowing that is possible would be great!!
Thank you in advance.

[dustin-ward]

Hey @Benjamin-Barda

Yes it is absolutely possible to get go-sqlite3 running on zOS. You’ll have to forgive me because it’s been a while since I’ve been involved with the project, but IIRC the best way to get it working was to first compile sqlite3.c into an archive and link the final go executable with it (You might have to try a couple of different C compilers… I remember one of clang or xlclang didn’t work for me)

[Benjamin-Barda]

At the end it was a little tricky to get it running on z/OS.

I ended up modifying the vendored library by replacing in both sqlite3-bindings.c/h the following definitions

#define SQLITE_ERROR_MISSING_COLLSEQ   (SQLITE_ERROR | (1<<8))
...
...
#define SQLITE_OK_SYMLINK              (SQLITE_OK | (2<<8)) /* internal use only */

with their resolved values. This made it work with xlclang along with the following compilation flags

-std=gnu99 -m64 -D_XOPEN_SOURCE_EXTENDED=1 -D_XOPEN_SOURCE=600 -DHAVE_NANOSLEEP=0"

I know this is a bit rough but I could not get it working with a precompiled library.
I leave this here given that there are few resources for z/OS and go.

A P.R might be possible to add it but I do not know how many people would be intrested.