[Kernel-meetup] Different behavior of gcc on Ubuntu

[Siddhesh Poyarekar]

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On Sunday 10 December 2017 07:11 PM, Bhavin Gandhi wrote:
> I was working on a project ecb-des[1] which uses libcrypt. When
> compiled on Ubuntu [gcc (Ubuntu 7.2.0-8ubuntu3) 7.2.0] with $ gcc
> -lcrypt ecb-des.c
> 
> it throws the error message[2], but when compiled with $ gcc
> ecb-des.c -lcrypt
> 
> it gets compiled. According to gcc docs[3] (as I have understood
> it) the second way is the correct one. But on other distributions
> both of the ways work, tried on Debian 9 [gcc (Debian 6.3.0-18)
> 6.3.0 20170516] and Fedora 27 [gcc (GCC) 7.2.1 20170915 (Red Hat
> 7.2.1-2)] After searching found no explanation about this different
> in GCC from Ubuntu. The same behavior is there on all the GCC
> versions present in Ubuntu 14.04, 16.04, 17.10. Most of the Ubuntu
> forum posts suggest the same way to link libraries[4] It would be
> great if I get any pointer about this difference, so that I can
> figure out the reason.

Did you compare the binutils versions between the distributions?  That
may give a clue as well.  Link ordering makes a difference, but I
haven't seen such behaviour with source files, only with object files.

Siddhesh
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