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The patch you point to was never applied to Ubuntu packages. Even more,
we have reverted it in all our releases.
The proper fix to this bug on ARM is in binutils:
https://sourceware.org/git/gitweb.cgi?p=binutils-
gdb.git;a=commitdiff;h=97323ad11305.
Dear binutils maintainers: do you think it will be possible to backport
the above fix to Trusty?
** Also affects: binutils (Ubuntu)
Importance: Undecided
Status: New
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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:
New
Status in qtbase-opensource-src package in Ubuntu:
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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