Re: std::log10() problem
Re: std::log10() problem
- Subject: Re: std::log10() problem
- From: Chris Espinosa <email@hidden>
- Date: Thu, 30 Mar 2006 14:45:36 -0800
On Mar 30, 2006, at 2:27 PM, Dirk Stegemann wrote:
Am 30.03.2006 um 19:24 schrieb Chris Espinosa:
On Mar 30, 2006, at 6:33 AM, Clark Cox wrote:
So, let me check my understanding. If, for instance, I build
something
using the 10.4 SDK, but I set the deployment version to 10.2, then
my
app will be able to access the newer symbols in 10.4, but those
symbols will be NULL when my app is running on 10.2 or 10.3.
But, if on the other hand, I build using the 10.2 SDK, then I simply
won't have access to symbols introduced in 10.3 and 10.4.
Am I understanding this correctly?
Absolutely right.
Is "won't have access to symbols" true because the compiler doesn't
know about these newer symbols due to missing headers at compile
time (could be fixed by manually adding the prototypes in question),
or due to some architectual reasons...?
The compiler will not see the header files that define the entry
point, because it's only looking at the headers in the SDK. The
linker will not link against the entry points, even if you define them
yourselves.
If you manually add the prototypes, then call them, the link will
fail. That is, unless you add the prototypes and conditionally define
them weak. In which case you've just ended up doing what the SDK does.
Chris
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