Fix/library not supporting curl version 8.0.x or higher, Closes #10

[Laeri]

Closes #84

[Laeri]

Some of the errors disappeared, but I still have the following ones with my changes.

• Generating bindings: 
  ERROR   
          # github.com/Laeri/go-curl
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:148:34: could not determine kind of name for C.CURLOPT_CLOSEFUNCTION
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:127:34: could not determine kind of name for C.CURLOPT_FTPASCII
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:111:34: could not determine kind of name for C.CURLOPT_HTTPREQUEST
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:130:34: could not determine kind of name for C.CURLOPT_MUTE
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:78:34: could not determine kind of name for C.CURLOPT_NOTHING
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:142:34: could not determine kind of name for C.CURLOPT_PASSWDDATA
          ../../../go/pkg/mod/github.com/!laeri/[email protected]/const_gen.go:141:34: could not determine kind of name for C.CURLOPT_PASSWDFUNCTION

[Laeri]

Ok I found out that these options that result in an error when compiling were removed going from version 7.15.5 to 7.16.0.
I am not sure how this works as compatgen should only have checked for minor version 10 or higher.

Do you think that simply requiring a minor version of 16 or higher is enough to finish this pull request?

[ilmari-lauhakangas]

I got help on #go-nuts in Libera Chat to make this patch work. I was building a program that uses go-curl as a dependency (cameradar) and it used constants that this patch removes. I worked around the problem by adding them back into const_gen.go like so:

OPT_RTSP_STREAM_URI           = C.CURLOPT_RTSP_STREAM_URI
OPT_RTSP_REQUEST              = C.CURLOPT_RTSP_REQUEST
OPT_RTSP_TRANSPORT            = C.CURLOPT_RTSP_TRANSPORT
OPT_TIMEOUT_MS                = C.CURLOPT_TIMEOUT_MS

But the fundamental issue diagnosis I got on #go-nuts was:

It's looking specifically for any lines with a #define CURLOPT_ prefix, but looking at current curl sources, those options have been changed to be enum constants now.

So codegen.py would have to be updated to support the new format.

[Laeri]

@ilmari-lauhakangas Thanks for having a look at it. I am currently working on other things so I won't be able to do your suggested changes for your info. Hopefully you or someone else can implement the missing changes.

[batmac]

Hi, If it can help in the meantime, I've fixed my go-curl usage with this trivial change: master...batmac:go-curl:batmac

[sprive]

Hello @andelf. Thank you for go-curl. Would you be able to review some pending PRs which fix blockers? Thank you.

[andelf]

@sprive Apologies, it's been quite some time since I've worked with Go. Since Go uses a repo-URL based package management system, I haven't given much attention to maintaining this particular repository.

I noticed this PR is still a working-in-progress. Could you provide some hints on which PR I should merge?

This project starts at the year 2011. It was the first Go code that implemented a bidirectional callback at that time.

[sprive]

Hello @andelf Definitely do not apologize (this looks great and I see you are exceptionally busy on other projects/languages). I am grateful you put this together as I have some use cases that are best handled by libcurl. :-)

So... I had the same error as @Laeri - building go-curl on a system with libcurl 8 or higher. I solved my problem more simply by adding LIBCURL_VERSION_MAJOR == 7:

compa:t.h::

#if (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 10 && LIBCURL_VERSION_PATCH < 1) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR < 10)
#error your version is TOOOOOOOO low

^^ fixed my build failure. :party:

What I could do (please advise):
option a) I pr only the above?
option b) I extend the LIBCURL_VERSION_MAJOR == 7 (blindly) to every single check in compat.h?
This type of change (and done without testing) gives me pause, if I don't a +1 first.

I would create a standalone PR for whichever you choose.

Unfortunately I'm not into libcurl (or C) enough to validate what all the different defines are for. But since these rules were written pre-curl 8, it seems to me to be OK in assuming they all mean LIBCURL_VERSION_MAJOR == 7.

[andelf]

@sprive Feel free to add a PR.😁
I remember that compat.h is generated using a Python script, filling all missing symbols.

[sprive]

Related: #88

PR#88 has some of the cleanup contained in here (but does not try to address the main curl8 issue, yet)

[sprive]

Related: #89

PR#89 contains the remainder of things not in the first PR above.
(if 89 is accepted, then "this" PR can be closed. Or I will remind to do so afterwards)