On Wed, Dec 16, 2015 at 12:54 PM, Tom Hughes <t...@compton.nu> wrote:
> On 16/12/15 19:48, Dave Johansen wrote: > >> On Wed, Dec 16, 2015 at 12:32 PM, Richard Shaw <hobbes1...@gmail.com >> <mailto:hobbes1...@gmail.com>> wrote: >> >> On Wed, Dec 16, 2015 at 1:15 PM, Dave Johansen >> <davejohan...@gmail.com <mailto:davejohan...@gmail.com>> wrote: >> >> I'm running into a linker issue when moving code that builds on >> RHEL 6 to Fedora or RHEL 7. Here's a simple reproducer: >> >> Download simple.c from >> >> https://github.com/markkilgard/glut/blob/master/progs/examples/simple.c >> and then run: >> g++ simple.c -lglut -o simple >> >> >> My SWG would be that for some reason on EL 6 you're getting the >> symbols for free perhaps due to the transitive nature of linking >> dynamic libraries? >> >> Since all you need to add is "-lGL" and it won't hurt anything on EL >> 6, seems like a pretty straight forward fix. >> >> >> Yes, in this simple example the fix is easy, but in our actual code it >> would mean changing the build command for hundreds of programs and >> several of them depend on multiple libraries which depend on multiple >> libraries, so it would be pretty time consuming. Plus, that's not even >> to mention the complexity and confusion that will be added when everyone >> wonders why a program is linking against a library it doesn't use. >> > > It is using it, or you wouldn't get that error. The reference is in the .o > file that the compiler has generated in /tmp for your input, not in a > library you are linking to. > > The cause of the change in behaviour will be this: > > https://fedoraproject.org/wiki/UnderstandingDSOLinkChange > Yes, with all of the available information, that change makes sense. It appears that this change wasn't documented with RHEL 7 but hopefully that will be fixed: https://bugzilla.redhat.com/show_bug.cgi?id=1292230
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