[patch] EXPORTED_SYMBOL_FILE support for cmake

[Nico Weber]

Since I won't have access to a windows or linux box until monday, this
addresses a FIXME and blocks deadstripping for the cmake build, I'll land
this for post-commit review and hope that the bots will help me sort things
out. (I tested the non-darwin branches on my os x box by temporarily
changing the conditionals, they seem to do what they're supposed to do.)


On Fri, Dec 27, 2013 at 10:08 PM, Nico Weber <thakis at chromium.org> wrote:

> Oh, looks like lto had half an implementation for Windows :-) This removes
> the Windows-specific code, since the general code should cover this (but
> Windows is as I said completely untested).
>
>
> On Fri, Dec 27, 2013 at 10:05 PM, Nico Weber <thakis at chromium.org> wrote:
>
>> Hi,
>>
>> while trying to port the dead code stripping patch (r198087) to cmake, I
>> noticed that the cmake build has no real support for EXPORTED_SYMBOL_FILE –
>> libclang in clang had half an implementation for Darwin with a FIXME for
>> other platforms, tools/gold had half an implementation for BFD ld…
>>
>> This patch tries to add real support – CMakeLists.txt just need to set
>> LLVM_EXPORTED_SYMBOL_FILE and things should Just Work.
>>
>> I've only tested this on OS X, and I don't have a ton of cmake
>> experience. Please review, and / or patch this in and build and let me know
>> how it goes (especially on linux or windows).
>>
>> Nico
>>
>
>
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