[wg-windows] mingw, ocamlopt and "input line is too long"

[Alain Frisch]

It seems flexdll decides to use response files only for file arguments 
when calling gcc, not taking other arguments into account.

I'll try to fix that.

-- Alain


On 07/07/2016 09:18, Andre Maroneze wrote:
> Thanks, using those flags it shows useful information:
>
> - A call to i686-w64-mingw32-as, with a short command line, that succeeds;
> - A call to flexlink, also with a short command line, using a response
> file (@C:\cygwin32\tmp\camlresp0050ba);
> - And then several lines:
>
> ** Use cygpath: true
> ** Search path: .... (lots of directories, one per line)
> ** Default libraries: ... (some -l<lib> followed by corresponding lines
> "** open: .../lib/<lib>.a")
> + i686-w64-mingw32-gcc -mconsole -shared -Wl,-e_FlexDLLiniter at 12  ...
> (lots of -I and -L, plus some extra flags, and this line is slightly
> larger than 8k characters)
> La ligne de commande est trop longue.
> ** Fatal error: Error during linking
>
> So it's that call to i686-w64-mingw32-gcc that fails. Is there a way to
> use a response file for that command as well?
>
>
> Regards,
>
>
> On 07/06/2016 10:00 PM, Andreas Hauptmann wrote:
>> Hi,
>>
>> On Wed, 6 Jul 2016 20:45:41 +0200
>> Andre Maroneze wrote:
>>> Has someone else also encountered this problem when compiling on
>>> Windows with a MinGW-based OCaml?
>> It's probably not your own command, that is too long, but a command
>> that is internally created by flexlink (or ocamlopt)
>> (See for example: https://github.com/alainfrisch/flexdll/issues/7 )
>>
>> Compile it with:
>>
>> export FLEXLINKFLAGS='-v -v -v'
>> export OCAMLPARAM='_,verbose=1'
>> ocamlfind ocamlopt ...
>>
>> then ocamlopt/ocamlc should print, which external commands they call to
>> stderr. And flexlink will also print some debug output.
>> With this information we can hopefully locate the point at which the
>> wrong command is generated.
>>
>>
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>