[PATCH] Allow to build without exporting symbols

[Jason Evans]

On Nov 19, 2012, at 1:54 AM, Mike Hommey <mh+jemalloc at glandium.org> wrote:
> On Thu, Nov 08, 2012 at 10:29:58PM +0100, Mike Hommey wrote:
>> On Thu, Nov 08, 2012 at 12:29:37PM -0800, Jason Evans wrote:
>>> On Nov 7, 2012, at 10:40 PM, Mike Hommey wrote:
>>>> From: Mike Hommey <mh at glandium.org>
>>>> 
>>>> When statically linking jemalloc, it may be beneficial not to export its
>>>> symbols if it makes sense, which allows the compiler and the linker to do
>>>> some further optimizations.
>>>> ---
>>>> […]
>>> 
>>> This looks to me like it will cause redefined symbol warnings.  Does it?
>> 
>> Why would it?
> 
> If you're thinking about redefined macros, that won't happen, because 
> autoconf also replaces #define MACRO foo when it handles
> AC_DEFINE(MACRO). Which is why it works without adding a #undef
> JEMALLOC_EXPORT in the first place.

That was indeed my thought.  I prefer to only use autoconf to replace #undef definitions, but in this case the idiom would be needlessly messy.

Thanks,
Jason