[PATCH] Add an LTO interface to parse metadata and extract linker options

[Sean Silva]

On Wed, Jan 15, 2014 at 9:26 PM, Nick Kledzik <kledzik at apple.com> wrote:

>
> On Jan 15, 2014, at 2:48 PM, Sean Silva wrote:
>
> On Wed, Jan 15, 2014 at 4:12 PM, kledzik at apple.com <kledzik at apple.com>wrote:
>
>>
>>
>> ================
>> Comment at: include/llvm-c/lto.h:201
>> @@ -201,2 +201,2 @@
>>
>>
>> ----------------
>> When you add new APIs to <llvm-c/lto.h> be sure to bump up
>> LTO_API_VERSION, so that clients to do compile time configuration checks if
>> the API exists.
>>
>
> We don't seem to document when features were introduced, so I don't see
> the point in this (do we expect clients to go searching through our version
> control history?). In practice, ./configure scripts and CMake use "does
> this function exist" checks to directly test the existence of the function
> (maybe you were talking about doing this purely inside an #ifdef in the
> source code?).
>
>
> Yes.  ld64 has lots of:
>   #If LTO_API_VERSION > 5
>     // use new lot api
>   #endif
> in its source code to enable it to build with lots of different versions
> of libLTO.dylib
>

Ok, I just am not seeing the usual "Since version ...." mentions in the
documentation.

-- Sean Silva


>
> -Nick
>
>
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