ralfD wrote
> Am Mittwoch, 01. März 2017 02:11 CET, MLutz <
> markus@
> > schrieb:
>
>> Thank you very much for all the help.
>> It finally worked, as soon as I deleted the "-fPIE" from line 163 of
>> CMakeLists.txt.
>> All other tries were in vain ...
>
> Are you shure the binary runs stable? AFAAIK you really need the -fpic
> flag to compile against
> newer Qt5 versions (unless you compiled Qt yourself and disabled Qt's
> "reduce relocations").
> From Qt's changelog:
>
> - On x86 and x86-64 systems with ELF binaries (especially Linux), due to
> a new optimization in GCC 5.x in combination with a recent version of
> GNU binutils, compiling Qt applications with -fPIE is no longer
> enough with GCC 5.x. Applications now need to be compiled with
> the -fPIC option if Qt's option "reduce relocations" is active. For
> backward compatibility only, Qt accepts the use of -fPIE for GCC 4.x
> versions.
> Note that Clang is known to generate incompatible code even with -fPIC
> if
> the -flto option is active.
> Applications using qmake or cmake >= 2.8.12 as their build system will
> adapt automatically. Applications using an older release of cmake in
> combination with GCC 5.x need to change their CMakeLists.txt to add
> Qt5Core_EXECUTABLE_COMPILE_FLAGS to CMAKE_CXX_FLAGS. In particular,
> applications using cmake >= 2.8.9 and < 2.8.11 will continue to build
> with the -fPIE option and invoke the special compatibility mode if using
> GCC 4.x.
As far as I can see, it works fine. The -fPIC option is set in
CMakeLists.txt.
See the lines:
set(CMAKE_CXX_FLAGS_DEBUG "-std=c++11 -fPIC -fPIE -g")
set(CMAKE_CXX_FLAGS_RELEASE "-std=c++11 -fPIC -O2 -DNDEBUG
-DQT_NO_DEBUG")
I only deleted the -fPIE, and now everything works ...
Best regards
Markus
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