[cfe-dev] [LLVMdev] Windows debug builds require /bigobj

[David Majnemer]

On Tue, Aug 26, 2014 at 12:43 PM, Samuel Benzaquen <sbenza at google.com>
wrote:

> On Tue, Aug 26, 2014 at 12:30 PM, Reid Kleckner <rnk at google.com> wrote:
>
>> Mmmm, delicious template instantiation. This has come up before, and the
>> solution was to reduce the complexity of the template to avoid follow-on
>> instantiations like SmallVector<T>.
>>
>
> In many cases, fixing this actually increases complexity of the code.
> For example, I have a change that removes ~16% of symbols by doing manual
> pointer deletion instead of using std::unique_ptr<>.
> I'll send the change for review.
>
> wrt whether LLVM should build without the /bigobj flag, that would be for
> someone else to decide.
>

I don't see any downside from switching /bigobj on; only ancient VS
toolchains do not support it.


>
> _Sam
>
>
>>
>> On Tue, Aug 26, 2014 at 6:57 AM, Oliver Stannard <oliver.stannard at arm.com
>> > wrote:
>>
>>> Hi all,
>>>
>>>
>>>
>>> Our windows debug builds of clang have started failing with this error
>>> message:
>>>
>>> …snip…\llvm\tools\clang\lib\ASTMatchers\Dynamic\Registry.cpp : fatal
>>> error C1128: number of sections exceeded object file format limit : compile
>>> with /bigobj
>>> […snip…\llvm\tools\clang\lib\ASTMatchers\Dynamic\clangDynamicASTMatchers.vcxproj]
>>>
>>>
>>>
>>> This is building the debug configuration using the MSVC from Visual
>>> Studio Pro 2012 update 4, the release build of the same source succeeded.
>>> The source used was LLVM/clang trunk as of about 0500 UTC. The build of the
>>> source from the same time a day before succeeded.
>>>
>>>
>>>
>>> The error is caused by one object file which would have to contain more
>>> than 2^16 sections. Adding /bigobj should fix this, but should LLVM be able
>>> to build without this option?
>>>
>>>
>>>
>>> The buildbots did not catch this because it only occurs for debug builds.
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Oliver
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>
>>
>
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