Bug 1426109

Created attachment 1256833 [details]
conftest.cpp

Ekiga package fails to build due to an error in libresolv detection. I do not see anything obvious (the libresolv-2.25.so seems to have the symbol still exported, the same as libresolv-2.24.so in Fedora 25), neither I'm able to influence the check code by any means, because it's generated by autotools with this code in configure.ac:

>  dnl Checking for libresolv
>  if test ${gm_platform} = "linux" ; then
>  	AC_CHECK_LIB(resolv, res_gethostbyaddr, [LIBS="-lresolv $LIBS"], AC_MSG_ERROR([You need the libresolv library to compile Ekiga]), -lresolv)
>  	LDAP_LIBS="${LDAP_LIBS} -lresolv"
>  fi

But more importantly, this generated code compiles fine under Fedora 25 (older gcc and glibc). I do not know where the problem is, thus I rather start in glibc. If you think this belongs to gcc or even to some part of the autotools, then feel free to move it there. I currently just know that the package doesn't build and it won't build until the issue is fixed or a proper workaround is found (an improper workaround would be not check for libresolv and just add it into the LDAP_LIBS; maybe I'll do it for the time being).

You can find attached the generated code from autotools, where is also pasted (at the top) the command the autotools uses to compile it. As noted above, exactly the same code and command works fine in Fedora 25, while it fails for undefined reference to 'res_gethostbyaddr' in rawhide.