Re: [gentoo-dev] linking with ld or gcc?

[Andreas Vinsander]

Harald van Dijk wrote:
> On Sun, Nov 05, 2006 at 06:47:07PM +0300, Peter Volkov (pva) wrote:
>> Hello.
>>
>> Short question: What shall we use to link libraries/programs: gcc or ld?
>> Why?
>>
>> A bit longer story: I have a problem during linking of wepattack on
>> amd64 systems. Linking stage issues warning:
>>
>> $ x86_64-pc-linux-gnu-ld  -o wepattack wepattack.o rc4.o wepfilter.o
>> log.o modes.o misc.o verify.o keygen.o -lpcap -lz -lcrypto
>> ld: warning: cannot find entry symbol _start; defaulting to
>> 0000000000400e10
>>
>> And resulted file is not executable. In google I found the most of
>> tutorials/howtos suggest to link with gcc but some programs still use
>> LD. From ld man page it's clear that it should link the program but this
>> is not working. So what is the right way to do that? Why?
>
> Link using gcc unless your program is a very special case. _start is defined
> in /usr/lib/crt1.o (may be slightly different on amd64), and that as well as
> other object files typically required by every program will be pulled in by
> gcc.

Doing some reading up on the list... thus the late answer.

gnu make provides you with the variables/macros that is usable for
linking. Look for 'LINK.c' etc in the output of 'make -p -f/dev/null'.
It might be wise to use them instead of the actual linker since you
might wanna port your project to some other compiler etc in the future.

/Andreas
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