ghc api and .o files
qdunkan at gmail.com
Tue Sep 25 02:39:50 CEST 2012
On Fri, Sep 14, 2012 at 6:22 PM, Brandon Allbery <allbery.b at gmail.com> wrote:
> On Fri, Sep 14, 2012 at 1:31 AM, Evan Laforge <qdunkan at gmail.com> wrote:
>> Relatedly, I've noticed that OS X is forgiving when you don't link in
>> a needed object. It will let me run code, but if I call a function
>> that's not linked in I get a crash. However, linux immediately prints
>> "unknown symbol `etc.'". The OS X behaviour is more convenient
>> because it's easy to avoid calling the missing functions, and
>> difficult to figure out how to cut all the dependencies so they're not
>> needed, but the linux way is certainly safer. Does anyone know why
>> this difference exists? Just curious.
> Because the system dynamic loader has different defaults. OS X defaults to
> a lazier lookup than Linux does; Linux is actually somewhat lazy about it,
> just not as lazy as OS X. Unfortunately I only know how to make them both
> stricter, not lazier.
> ("man ld.so" on Linux, "man dyld" on OS X, for the details)
I thought ghc uses its own homegrown loader, not the system one? I.e.
ghci loads .o files, not .dyld or .so.
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