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This bug was fixed in the package binutils - 2.24-5ubuntu13

---------------
binutils (2.24-5ubuntu13) trusty-proposed; urgency=medium

  * SRU LP: #1311866.
  * Update from the 2.24 branch, 20141113.
    - Fix PR gold/16945, properly handle 64-bit GOT relocations on x86_64.
    - Fix PR gold/16900, an issue where first reserved word of GOT is not
      initialized if there is no PLT.
    - gold: Fix handling of __ehdr_start when it cannot be defined.
    - Apply mainline patches for ppc476 workaround.
    - Add binutils test cases for AArch64.
    - Disassembler fix on AArch64.
    - Fix PR ld/17047, crash in the bfd linker with MALLOC_PERTURB.
    - Fix PR ld/17277, ARM32, bogus DT_TEXTREL marker (and R_ARM_NONE)
      for PC-relative cross-section relocs.
    - [AArch64] Cortex-A53 erratum 835769 linker workaround.
  * Remove the aarch64-fix-instruction-mask, applied on the branch.
  * Fix PR gold/15639, -flto and ld.gold on ARM. LP: #1191909.
  * Use 64k for COMMONPAGESIZE on PPC. LP: #1412553.
  * Fix PR ld/16452, PR ld/16457, don't output symbol version definitions
    for non-DT_NEEDED. LP: #1248642.
  * Add powerpc target for ppc64el builds. Closes: #760395. LP: #1433238.
  * binutils-doc: Include all info files. LP: #1410780.
  * Fix PR ld/16715 (ARM), set st_value to zero for undefined symbols.
    LP: #1441961.
 -- Matthias Klose <doko@xxxxxxxxxx>   Tue, 14 Apr 2015 19:52:45 +0200

** Changed in: binutils (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1441961

Title:
  dataChanged signal cannot be used on ARM under certain conditions

Status in binutils package in Ubuntu:
  Fix Released
Status in qtbase-opensource-src package in Ubuntu:
  New
Status in binutils source package in Trusty:
  Fix Released
Status in qtbase-opensource-src source package in Trusty:
  New

Bug description:
  This is probably the strangest bug I have ever observed, but it is
  completely reproducible. When running the attached Qt application, I
  receive the following error:

      QObject::connect: signal not found in Test

  This error is 100% reproducible on my Raspberry Pi 2 running Ubuntu
  14.04.2 (Trusty). This device has an ARMv7 CPU (Broadcom BCM2836). I
  cannot reproduce this error on any other hardware (x86 and amd64 have
  been tested). This does not appear to be a compiler bug since both g++
  and Clang produce an executable that prints the above error.

  Here's the thing that really confuses me: the error disappears (and
  everything works correctly) if I comment out the "dataChanged(...)"
  line in test.cpp. This is completely bizarre because the line is never
  executed by any code.

  I've tried digging through Qt's headers and buried myself neck-deep in
  macros, templates, and MOC-generated files. I can't make any sense out
  of this. Therefore I am reporting it as a bug. To compile the example,
  enter the source directory, run "qmake", and then run "make" to build
  the executable. Remember, the bug only manifests itself on an ARM CPU.

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