While Chad does indeed use clang + emcc ... I think you can use emcc for
the first stage, just indicate that you want the output file to be .bc and
emcc won't go and run everything on it:
emcc -o whatever.bc -c whatever.cpp ...
Try it out!
- Bruce
On Tue, Sep 16, 2014 at 3:32 PM, Robert Tweed <fistful.of.spann...@gmail.com
> wrote:
> I'm using emcc for both stages. I didn't know you could use clang
> directly. Which options are you using? Do you just add emscripten's include
> directory to the include path so it can find emscripten.h, or is there a
> lot more to do besides that to make it work?
>
> - Robert
>
> On 15/09/2014 19:16, Chad Austin wrote:
>
> Are you using emcc or clang to do the .cpp -> .bc compilation? If you
> use clang directly, you may have some additional control over the build
> options.
>
> We do exactly what it sounds like you want, but by only invoking emcc at
> the final .bc -> .js step.
>
>
> On Mon, Sep 15, 2014 at 3:59 AM, Robert Tweed <
> fistful.of.spann...@gmail.com> wrote:
>
>> Hi list,
>>
>> Using make, I want to be able to produce two different versions of the
>> final output JS: one completely optimised and minified; the other that is
>> fully indented, commented and readable.
>>
>> Ideally, I would run a compile step from *.cpp -> *.bc, then I would run
>> a link step which specifies the optimisation level for that target (either
>> full, or none). But, there's a problem with that.
>>
>> If I compile the intermediate step without the -O2 option, my final
>> "optimised and minified" script is about 500K (this is with options "-O2
>> --closure 1" in the link step). OTOH, if I do include the -O2 option in the
>> first compile pass, my output is down to 100K (quite a significant
>> difference) but my "fully readable" script is now minified as well.
>>
>> Is there any way around this without having to compile from scratch each
>> time, or maintain two separate sets of intermediate files (which largely
>> defeats the purpose)?
>>
>> TIA,
>>
>> - Robert
>>
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>
>
> --
> Chad Austin
> Technical Director, IMVU
> http://engineering.imvu.com <http://www.imvu.com/members/Chad/>
> http://chadaustin.me
>
>
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