[Bug 1340250] Re: "#pragma weak" symbol is 0 even when defined

[LocutusOfBorg]

Wl,--no-as-needed works, while adding a manual "-lpthread" doesn't,
because the library doesn't get linked to the program. Reason is
probably that weak symbols are not added by the linker

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Title:
  "#pragma weak" symbol is 0 even when defined

Status in binutils package in Ubuntu:
  Invalid
Status in gcc-defaults package in Ubuntu:
  Invalid
Status in libidn package in Ubuntu:
  New
Status in libunistring package in Ubuntu:
  New

Bug description:
  This compiler bug is making the gnulib tests dump core; see:

  http://lists.gnu.org/archive/html/bug-gnulib/2014-07/msg00039.html

  Compile and run the following program t.c with the shell commands "gcc
  u.c -lm; ./a.out; echo $?"

  #include <math.h>
  #pragma weak tgamma

  int
  main (void)
  {
    if (!tgamma)
      return 2;
    if (tgamma (1) == 1)
      return 0;
    return 1;
  }

  The program will exit with status 2.  It should exit with status 0,
  because the math library does have a tgamma function and the function
  pointer should be non-null.

  I observe this problem with Ubuntu 14.04 x86-64 (GCC Ubuntu
  4.8.2-19ubuntu1), but not on Fedora 20 or on RHEL 6.5.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gcc 4:4.8.2-1ubuntu6
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Jul 10 07:39:11 2014
  InstallationDate: Installed on 2012-12-21 (566 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  SourcePackage: gcc-defaults
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (83 days ago)

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