[Qt-creator] Code completion doesn't work with ClangCodeModel

[Sergey Shambir]

Unfortunately project building and indexing are handled separately.
ClangCodeModel does not take compiler flags in the same way as compiler -
it attempts to infer them from metadata. Project meta collected by build
system specific parser which is part of build system plugin.

So ClangCodeModel just will not see fPIC flag nor on cmake neither on other
build system.

Year ago I made patches to fix this limitation, but I also should make a
few modifications in ClangCodeModel plugin to make it work. Since clang
branch was merged, that's time to finish it, so please wait a few weeks :)

After that flag-related bugs still will happen on some build systems such
as autotools and especially on windows.
14 янв. 2014 г. 13:17 пользователь "Bernhard Seßler" <
bernhard.sessler at corscience.de> написал:

> Hi,
>
> your own project needs to be build with either -fPIC or -fPIE (as it's
> using the
> pre-built Qt 5.2.0 libraries which have PIC enabled by default)
>
> Regards,
> Bernhard
>
>
> On 14.01.2014 10:06, Yang Fan wrote:
> > Hi,
> >
> > One more question, which target should be built with the option -fPIE or
> > -fPIC? The libclang so? The ClangCodeModel plugin? The QtCreator IDE? Or
> my
> > own project edited by QtCreator?
> >
> >
> > On Tue, Jan 14, 2014 at 4:47 PM, Bernhard Seßler <
> > bernhard.sessler at corscience.de> wrote:
> >
> >> Hi,
> >>
> >> as far as I can see, you've got another problem: the binaries from
> >> qt-project.org were configured with the -reduce-relocations switch (and
> >> thus
> >> build with the -fPIC compiler switch), which means that your executable
> /
> >> library also must be compiled with position independent code activated
> >> (see:
> >> http://en.wikipedia.org/wiki/Position-independent_code).
> >>
> >> All in all it's just adding the -fPIE (when building an executable) or
> >> -fPIC
> >> command line switch (when building a library) to the compiler arguments
> >> (in case
> >> you're using gcc).
> >>
> >> E.g. using CMake as build system (>= 2.8.9), it's as simple as:
> >>
> >> set(CMAKE_POSITION_INDEPENDENT_CODE ON)
> >>
> >> to enable generating position independent code for all top level
> targets,
> >> or
> >>
> >> set_target_properties(<target> PROPERTIES POSITION_INDEPENDENT_CODE ON)
> >>
> >> to enable it only for the given <target>.
> >>
> >>
> >> Regards,
> >> Bernhard
> >>
> >> On 14.01.2014 01:56, Yang Fan wrote:
> >> > Hi,
> >> >
> >> > I have dumpped the error messages, seemly it's caused by the Qt 5.2
> >> > binaries. I'm using the binaries downloaded from
> >> > http://qt-project.org/downloads.
> >> >
> >> > *** Reparse for highlighting took 481 ms.
> >> > "error" "/home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtCore/qglobal.h"
> >> > [996:4(33790)] ""You must build your code with position independent
> code
> >> if
> >> > Qt was built with -reduce-relocations. "         "Compile your code
> with
> >> > -fPIC or -fPIE."
> >> >   in file included from /home/tvu/Shareware/istkani/src/main.cpp:1:
> >> >   in file included from /home/tvu/Shareware/istkani/src/main.cpp:1:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtWidgets/QApplication:1:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtWidgets/qapplication.h:45:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:45:"
> >> > "error" "/opt/intel/composer_xe_2013.0.079/compiler/include/math.h"
> >> > [27:3(742)] ""This Intel <math.h> is for use with only the Intel
> >> compilers!"
> >> >   in file included from /home/tvu/Shareware/istkani/src/main.cpp:1:
> >> >   in file included from /home/tvu/Shareware/istkani/src/main.cpp:4:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtQml/QtQml:3:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtQml/QtQmlDepends:2:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtCore/QtCore:65:
> >> >   in file included from
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtCore/qmath.h:49:"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [46:5(1373)] "no
> >> member
> >> > named 'QDir' in 'QFont'"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [57:10(1716)] "use
> of
> >> > undeclared identifier 'dir'; did you mean 'div'?
> >> >   'div' declared here"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [57:10(1716)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [57:14(1720)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [59:9(1792)] "use
> of
> >> > undeclared identifier 'dir'; did you mean 'div'?
> >> >   'div' declared here"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [59:9(1792)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [59:13(1796)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [60:9(1812)] "use
> of
> >> > undeclared identifier 'dir'; did you mean 'div'?
> >> >   'div' declared here"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [60:9(1812)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [60:13(1816)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [61:28(1872)] "use
> of
> >> > undeclared identifier 'dir'; did you mean 'div'?
> >> >   'div' declared here"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [61:28(1872)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > "error" "/home/tvu/Shareware/istkani/src/main.cpp" [61:32(1876)]
> "member
> >> > reference base type 'div_t (int, int) throw()' is not a structure or
> >> union"
> >> > *** Highlighting took 491 ms in total.
> >> > *** Fast re-indexing took 0 ms in total.
> >> > /home/tvu/Qt5.2.0/5.2.0/gcc_64/include/QtCore/qglobal.h:996:4: error:
> >> "You
> >> > must build your code with position independent code if Qt was built
> with
> >> > -reduce-relocations. "         "Compile your code with -fPIC or
> -fPIE."
> >> > /opt/intel/composer_xe_2013.0.079/compiler/include/math.h:27:3: error:
> >> > "This Intel <math.h> is for use with only the Intel compilers!"
> >> > /home/tvu/Shareware/istkani/src/main.cpp:48:5: error: no member named
> >> > 'QDir' in 'QFont'
> >> > /home/tvu/Shareware/istkani/src/main.cpp:57:10: error: use of
> undeclared
> >> > identifier 'dir'
> >> > /home/tvu/Shareware/istkani/src/main.cpp:59:9: error: use of
> undeclared
> >> > identifier 'dir'
> >> > /home/tvu/Shareware/istkani/src/main.cpp:60:9: error: use of
> undeclared
> >> > identifier 'dir'
> >> > /home/tvu/Shareware/istkani/src/main.cpp:61:28: error: use of
> undeclared
> >> > identifier 'dir'
> >> > ... Completion done in 3313 ms, with 146 items.
> >> >
> >> >
> >> >
> >> > On Mon, Jan 13, 2014 at 6:07 PM, Erik Verbruggen
> >> > <erik.verbruggen at digia.com>wrote:
> >> >
> >> >> On 11-1-2014 3:07, Yang Fan wrote:
> >> >> > Hi,
> >> >> >
> >> >> > I have built the ClangCodeModel plugin successfully with Qt5.2 on
> Mac
> >> OS
> >> >> > X 10.9 and on Debian Wheezy, but after I enabled the plugin and
> >> selected
> >> >> > the Code Model in Preference dialog, the code completion feature
> >> doesn't
> >> >> > work. When I typed a dot follows an object name, no candidate list
> >> >> > appears. Any suggestion?
> >> >>
> >> >> Can you run with the environment variable QTC_CLANG_VERBOSE set
> (value
> >> >> doesn't matter), and check stdout? That should show the libclang
> >> >> invocations plus any errors while parsing.
> >> >>
> >> >> -- Erik.
> >> >>
> >> >> _______________________________________________
> >> >> Qt-creator mailing list
> >> >> Qt-creator at qt-project.org
> >> >> http://lists.qt-project.org/mailman/listinfo/qt-creator
> >> >>
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > _______________________________________________
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> >> >
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> >
> >
> >
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