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Bug#829329: marked as done (Error combining hardening flags with Qt5)

Your message dated Sat, 2 Jul 2016 14:38:39 -0300
with message-id <[🔎] CA+QPbz3fSW_Fb81CLBLhtxOgn=3GdAmmS--_c9Up_nr7CZw1ig@mail.gmail.com>
and subject line Re: Bug#829329: Error combining hardening flags with Qt5
has caused the Debian Bug report #829329,
regarding Error combining hardening flags with Qt5
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
829329: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829329
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libqt5core5a
Version: 5.6.1+dfsg-3
Severity: normal

I'm trying to enable Qt5 support for the lyx package I maintain.
I have already enabled hardening flags, and I get the following error when
building the package:

g++ -DHAVE_CONFIG_H -I. -I../../../src/support -I../..  -Wall -Wextra
-I../../../src/support/..  -DQT_NO_STL -DQT_NO_KEYWORDS
-I/usr/include/x86_64 -linux-gnu/qt5/QtConcurrent
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtSvg
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtWidgets
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtGui
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtCore
-I/usr/include/x86_64-linux-gnu/qt5 -Wdate-time -D_FORTIFY_SOURCE=2
-std=c++11 -fPIC -O2 -Wno-deprecated-declarations -g -O2 -fPIE
-fstack-protector-strong -Wformat -Werror=format-security -c -o
ConsoleApplication.o ../../../src/support/ConsoleApplication.cpp
In file included from
/usr/include/x86_64-linux-gnu/qt5/QtCore/qcoreapplication.h:37:0,
                 from
/usr/include/x86_64-linux-gnu/qt5/QtCore/QCoreApplication:1,
                 from
../../../src/support/../support/ConsoleApplicationPrivate.h:16,
                 from ../../../src/support/ConsoleApplication.cpp:15:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:1087:4: error:
#error "You must build your code with position independent code if Qt
was built with -reduce-relocations. " "Compile your code with -fPIC
(-fPIE is not enough)."
 #  error "You must build your code with position independent code if
Qt was built with -reduce-relocations. "\
    ^


By default, -fPIC is used for shared libraries and -fPIE for
executables such as lyx. The latter takes precedence as it is later in
the argument list.
I can get away with the problem if I append -fPIC to CXXFLAGS but I
think this is not the proper solution, but a workaround.
A similar issue was reported also on Bug: #828878 and the fix was the
aforementioned workaround.


Kind regards,
Nick

--
=Do-
N.AND

--- End Message ---
--- Begin Message ---

Hi Nikos! This is no qt bug, you need to use just -fPIC, avoiding -fPIE. Please note that there is no security reduction here as -fPIC implies -fPIE.

Happy hacking!

--
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/


--- End Message ---
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