[PATCH] D17347: Use LLVM_LIBRARY_VISIBILITY to prevent LLVM dynamic libraries from export symbols for SROA internals.

[Owen Anderson via llvm-commits]

> On Feb 23, 2016, at 4:31 PM, Owen Anderson via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> 
>> On Feb 23, 2016, at 3:19 PM, Justin Bogner <mail at justinbogner.com <mailto:mail at justinbogner.com>> wrote:
>> 
>> This, on the other hand, seems like a fair bit of boilerplate for not
>> much gain. These are private methods and are used by run(), so hiding
>> them won't really help us dead strip more or anything like that, and I
>> don't really see why passes should be special compared to other LLVM
>> classes in this regard.
>> 
>> The way I see it, if it's worth hiding the private members here, why
>> wouldn't we do something to generally hide private members in most or
>> all of LLVM?
> 
> I would very much like to hide them everywhere in LLVM.

For context, a libLLVM.dylib built against TOT, with externalized and internal symbols stripped, is 34MB.   That binary exports 18629 symbols, and the symbol table consumes more than 1MB of space in the binary.  In addition to reclaiming that binary space, I am also very interested in reducing the launch time of applications linking against that dylib, which grows with the number of exported symbols.

—Owen

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