std library hooks

[Manu]

On 14 April 2012 11:36, Walter Bright <newshound2 at digitalmars.com> wrote:

> On 4/14/2012 1:01 AM, Vladimir Panteleev wrote:
>
>> On Saturday, 14 April 2012 at 02:46:03 UTC, Walter Bright wrote:
>>
>>> all assert(exp) does when it trips is call a function in the library. If
>>> you
>>> provide your own version of that function, the one in the library won't
>>> be
>>> linked in.
>>>
>>
>> This indeed works, but how exactly? In what case does the linker pick one
>> function (which?) and in what case does it complain about duplicate symbol
>> definitions? Do they have to be in different libraries?
>>
>
> The linker works by looking in the library for any unresolved symbols. The
> symbol is not unresolved if you supply your own explicitly in an object
> file explicitly supplied to the linker.
>
> The linker knows nothing about D, C, assembler, or anything but resolving
> symbols.
>

How do you define 'the' linker? Is this also how ld and link.exe works?
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