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[Thomas Orgis <thomas-forum AT orgis.org>]

Even hacking -fPIC manually into CMAKE_FLAGS in that try_compile line
doesn't help. It's stripped out. It's official, I hate cmake, too, not
just scons.

But eh … I am wondering … Why doesn't the native x86-64 archspec
include PIC? I might even be to blame for that? Why doesn't it break
elsewhere? I need to dig deep in memory about that. Did we have a time
when we decided that stuff works without enforcing PIC everywhere? I'm
not sure about anything now (except that software sucks).

But even with appending PIC to CXXFLAGS in BUILD, I get this:

[1/2] Building CXX object CMakeFiles/cmTC_adec6.dir/check_qt_visibility.cpp.o
FAILED: /usr/bin/c++    -I/opt/qt5/include -I/opt/qt5/include/QtCore 
-I/opt/qt5/./mkspecs/linux-g++ -I/opt/qt5/include/QtWidgets 
-I/opt/qt5/include/QtGui -march=native -mtune=native -m64 -pipe -O3 -fPIC 
-DPIC  -Wnon-virtual-dtor -Wno-long-long -Wundef -Wcast-align 
-Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-exceptions 
-DQT_NO_EXCEPTIONS -fno-check-new -fno-common -Woverloaded-virtual 
-fvisibility=hidden  -fPIE -o 
CMakeFiles/cmTC_adec6.dir/check_qt_visibility.cpp.o -c 
/usr/src/phonon-4.8.3/build/CMakeTmp/check_qt_visibility.cpp
In file included from /opt/qt5/include/QtCore/QtGlobal:1:0,
                 from 
/usr/src/phonon-4.8.3/build/CMakeTmp/check_qt_visibility.cpp:1:
/opt/qt5/include/QtCore/qglobal.h:1067:4: 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. "\
    ^
ninja: build stopped: subcommand failed.

CMake Error at cmake/FindPhononInternal.cmake:416 (message):
  Qt compiled without support for -fvisibility=hidden.  This will break
  plugins and linking of some applications.  Please fix your Qt installation
  (try passing --reduce-exports to configure).
Call Stack (most recent call first):
  CMakeLists.txt:47 (include)


So, perhaps there really needs to be a change in how qtbase is built?!


Alrighty then,

Thomas

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