[Ipopt-tickets] [Ipopt] #229: Add "-Wl, --no-as-needed" to LDFLAGS

[Ipopt]

#229: Add "-Wl,--no-as-needed" to LDFLAGS
--------------------------+------------------------
  Reporter:  galago       |      Owner:  ipopt-team
      Type:  enhancement  |     Status:  new
  Priority:  normal       |  Component:  Ipopt
   Version:  3.11         |   Severity:  normal
Resolution:               |   Keywords:  undefined
--------------------------+------------------------

Comment (by kelman):

 I suspect this is being caused by similar reasons as a problem that has
 been seen with libdl on Ubuntu systems (http://list.coin-
 or.org/pipermail/ipopt/2013-November/003569.html). It's not necessarily an
 issue with --as-needed, though adding that flag serves as a workaround. I
 believe the problem is more likely due to symbols like pthread_create now
 being versioned symbols in recent Ubuntu, Mint, and/or Debian
 distributions.

 Another workaround would be to add the configure flag --disable-pthread-
 mumps since MUMPS is probably the only thing in Ipopt using pthreads
 (unless you're using a multithreaded BLAS, LAPACK, or newer linear solver)
 and it's really not doing much within MUMPS.

 I suspect that if libcoinmumps was linked to libpthread and libipopt was
 linked to libcoinmumps, you would also not see any problems since the
 versioned symbols would be resolved properly by the linker (even without
 adding --no-as-needed). This is currently not the default setup in the
 Ipopt build system, but it can be optionally enabled by adding the
 configure flag --enable-dependency-linking.

 The -Wl,--no-as-needed flag isn't the kind of thing we would add by
 default anywhere in Ipopt's build system, as it only works around this
 issue on some Linux distributions. The flag could easily cause an error if
 you're using a compiler other than GCC (Visual Studio, etc) or a linker
 other than GNU ld (Darwin dyld, Microsoft link.exe, etc).

--
Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/229#comment:1>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.