There was a fix in llvm but that's not made it to emscripten latest yet.
However it is in the incoming sdk so try that toolset.

I closed the pull request fix as it's already on its way.
 On 29 Jan 2015 03:50, <[email protected]> wrote:

> I'm experiencing the same problem on 1.29, 528KB object file in 8GB+ file
> out. Where is the pull request you mentioned?
>
> On Thursday, January 8, 2015 at 4:53:06 AM UTC-8, Lee Morgan wrote:
>>
>> Ok I found it - .a archive files only have 6 digits for user Ids and
>> lvm-ar.cpp isnt properly checking for overflow causing huge padding
>> characters to be written.
>>
>> I generated a pull request although I don't know why this hasn't been a
>> problem for someone before now.
>>
>> Thanks.
>>
>> On Monday, January 5, 2015 4:15:42 PM UTC, Lee Morgan wrote:
>>>
>>> Actually I've found it happens with the freetype test case 'python
>>> tests/runner.py test_freetype' as this invokes the linker.
>>>
>>> Again it quickly creates an 8gb file and writes empty strings. If left
>>> running it will eventually start appending - I haven't left it long enough
>>> to finish - although the appending makes me suspect it will just fill the
>>> disk.
>>>
>>> I last tried with sdk-master-64bit but the incoming sdk has the same
>>> behaviour. I've left settings.js alone assuming 'emsdk install xxx' will
>>> overwrite it from the repo so it should be sensible defaults.
>>>
>>> The /tmp where the temporary library file is created is on a partition
>>> with 12G free space.
>>>
>>> I'm stumped on what would cause it though.
>>>
>>>
>>> On Friday, December 19, 2014 8:06:48 PM UTC, Alon Zakai wrote:
>>>>
>>>> That sounds strange. The output library is bigger than the input files,
>>>> and contains lots of empty space? Is it functional otherwise though?
>>>>
>>>> Do you have a testcase that shows the problem?
>>>>
>>>> - Alon
>>>>
>>>>
>>>> On Fri, Dec 19, 2014 at 3:41 AM, Lee Morgan <[email protected]>
>>>> wrote:
>>>>>
>>>>> Hi
>>>>>
>>>>> llvm-ar appears to be writing a huge and empty file when trying to
>>>>> build a library.
>>>>>
>>>>> strace reports thousands of 4k writes of blank strings and I can zip
>>>>> the eventual output from 8Gb to 8Mb.
>>>>>
>>>>> Does anyone know why this could be?
>>>>>
>>>>> Thanks!
>>>>>
>>>>> (on ubuntu 14.4)
>>>>> ./emsdk list
>>>>>
>>>>> The following individual tools exist:
>>>>>            clang-incoming-32bit
>>>>>            clang-incoming-64bit
>>>>>            clang-master-32bit       INSTALLED
>>>>>     (*)    clang-master-64bit       INSTALLED
>>>>>            emscripten-1.25.0         INSTALLED
>>>>>            emscripten-1.27.0
>>>>>            emscripten-incoming
>>>>>     (*)    emscripten-master         INSTALLED
>>>>>
>>>>>
>>>>> The following Emscripten SDK versions are available:
>>>>>          sdk-incoming-32bit
>>>>>          sdk-incoming-64bit
>>>>>          sdk-master-32bit         INSTALLED
>>>>>     *    sdk-master-64bit         INSTALLED
>>>>>
>>>>> Items marked with * are activated for the current user.
>>>>> Items marked with (*) are selected for use, but your current shell
>>>>> environment is not configured to use them. Type "source ./emsdk_env.sh" to
>>>>> set up your current shell to use them, or call "emsdk activate --global
>>>>> <name_of_sdk>" to permanently activate them.
>>>>>
>>>>> To access the historical archived versions, type 'emsdk list --old'
>>>>>
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