Re: [Newbie question] compilation,, linking and general libbfd/libiberty question

[Florian Mayer <mayerflorian at me dot com>]

I still don't know why just using
gcc -o foo foo.c -lbfd
with bfd.h included does not work, but
gcc -o tbfd tbfd.c -L . -lbfd -liberty -ldl -lz
works now for me...

Regards
Florian

On 01/31/2015 02:33 AM, Florian Mayer wrote:
> Newbie here, hello!
>
> Currently I'm trying to use the libbfd to read the symbol table of
> arbitrary object
> files (preferable x86 and ELF). At the moment I am stuck at compiling
> and linking.
> I am working on an x64 Archlinux Laptop (very recently updated)
> and I used the following commandline for compilation:
> $ gcc  -o tbfd tbfd.c /usr/lib/libiberty.a /usr/lib/libbfd.a -liberty
> -lbfd -ldl
> Result:x64
> ---------
> /usr/lib/libbfd.a(compress.o): In function 
> `bfd_compress_section_contents':
> (.text+0x2c): undefined reference to `compressBound'
> /usr/lib/libbfd.a(compress.o): In function 
> `bfd_compress_section_contents':
> (.text+0x57): undefined reference to `compress'
> /usr/lib/libbfd.a(compress.o): In function 
> `bfd_get_full_section_contents':
> (.text+0x322): undefined reference to `inflateInit_'
> /usr/lib/libbfd.a(compress.o): In function 
> `bfd_get_full_section_contents':
> (.text+0x33c): undefined reference to `inflateReset'
> /usr/lib/libbfd.a(compress.o): In function 
> `bfd_get_full_section_contents':
> (.text+0x36f): undefined reference to `inflate'
> /usr/lib/libbfd.a(compress.o): In function 
> `bfd_get_full_section_contents':
> (.text+0x37f): undefined reference to `inflateEnd'
> collect2: error: ld returned 1 exit status
>
> My includes are:
>    4 #include <bfd.h>
>    5 #include <stdlib.h>
>    6 #include <stdio.h>
>    7 #include <stdint.h>
>    8 #include <libiberty/libiberty.h>
>    9 #include <dlfcn.h>
>
> I know I am missing some library flags or include files, but I have
> really no idea 
> andhttps://sourceware.org/binutils/docs-2.25/bfd/index.html
> wasn't very helpful. Could you tell me what I am doing wrong?
> Is there any additional introductory material that I could read.
>
> Best regards
> Florian
>
> PS: Sorry for the question, but why is the libiberty no independent
> shared object? I read that it has historically and propably organically
> grown, but I don't see why this is the reason for libiberty not beeing a
> .so for it's own...
>
> Sorry for the bad english...