Re: ffi-helper: looking for C libraries to try

[Matt Wette <matt.wette@gmail.com>]

> On Jul 15, 2017, at 5:37 AM, Matt Wette <matt.wette@gmail.com> wrote:
> 
> 
>> On Jul 15, 2017, at 1:24 AM, Amirouche <amirouche@hypermove.net> wrote:
>> 
>> 
>> 
>> Le 15/07/2017 à 06:35, Matt Wette a écrit :
>>>> On Jul 14, 2017, at 5:44 PM, Amirouche Boubekki <amirouche@hypermove.net> wrote:
>>>> 
>>>> On 2017-07-15 01:17, Matt Wette wrote:
>>>>>  I tried git2 but those headers are too
>>>>> broken.
>>>> What do you mean by "too broken"? Maybe it will be easier in the long run to maintain our own version of the headers than manually bind everything. Even if it requires to create a shim layer in scheme to have a proper set of bindings that schemer will enjoy. Also, git is a good candidate since there are some tests already in guile-git [1].
>>> Maybe another bug in my CPP.
>>> 
>>> (define-ffi-module (libgit2)
>>>  #:include '("git2.h")
>>>  #:inc-dirs '("/opt/local/include")
>>>  #:library '("git2")
>>>  )
>>> 
>>> mwette$ guild compile-ffi libgit2.ffi
>>> (unknown):1: not found: “common.h"
>>> 
>>> 
>> With the following .ffi file:
>> 
>> (define-ffi-module (libgit2)
>> #:include '("git2.h")
>> #:inc-dirs '("/usr/include" "/usr/include/git2" "/usr/include/x86_64-linux-gnu/"  "/usr/include/linux/")
>> #:library '("git2")
>> )
>> 
>> I now have the following output:
>> 
>> $ guild compile-ffi libgit2/libgit2.ffi
>> TODO: compile-ffi args, arrays, extern variables
>> (unknown):1: parse failed at state 59, on input "__attribute__"
>> (unknown):1: C99 parse error
>> 
> 
> No surprise that it doesn’t work right now on non-Mac.  Add  #:inc-help ‘((“__builtin” “__attribute__(X)=“))
> 
> My goal is release something that works in October 2017.  That may be an ambitious goal.
> 
> Matt

When I created the C parser, I tried to put in hooks that would help avoid the highly system-dependent, compiler-dependent rat’s nest under /usr/include.  With the FFI I will probably not be able to avoid /usr/include.  So, I will likely have to deal with passing flags from guild down to the translator in order to deal with these things.  In addition, the Mac has non-standard features like int foo() adm(“foo”);

Matt