plplot-devel

[Plplot-devel] Qt5 / cmake error

[Hazen B. <hba...@ma...>]

Hello,

As Qt4 is now at least technically no longer supported I thought I might 
spend some time to see if I could get our PyQt bindings to work with 
Qt5. However unfortunately I can't even build PLplot with Qt5 due to a 
cmake error. Any suggestions would be appreciated.

The error message:

CMake Error at bindings/qt_gui/CMakeLists.txt:54 (target_link_libraries):
   The plain signature for target_link_libraries has already been used with
   the target "plplotqt".  All uses of target_link_libraries with a target
   must be either all-keyword or all-plain.

   The uses of the plain signature are here:

    * /usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreMacros.cmake:278 
(target_link_libraries)


I used this command in my build directory:
cmake -DPLPLOT_USE_QT5=ON ../plplot > cmake.txt 2>&1

CMake log files attached.

lubuntu 15.10.

 > uname -a
Linux Dell-XPS-8100 4.2.0-25-generic #30-Ubuntu SMP Mon Jan 18 12:31:50 
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

-Hazen

Re: [Plplot-devel] Qt5 / cmake error

[Greg J. <gv...@gm...>]

I know that one, it came up for me when building a new shared library
and one of the target_link_libraries() calls included "PRIVATE" as a keyword
(i.e., exactly what it said).  I took out the "PRIVATE " and it worked.
What that all means, I don't know! the result worked out for linux.

http://sourceforge.net/p/gnudatalanguage/patches/95/#4f41/b267



On Thu, Jan 21, 2016 at 6:23 PM, Hazen Babcock <hba...@ma...> wrote:

>
> Hello,
>
> As Qt4 is now at least technically no longer supported I thought I might
> spend some time to see if I could get our PyQt bindings to work with Qt5.
> However unfortunately I can't even build PLplot with Qt5 due to a cmake
> error. Any suggestions would be appreciated.
>
> The error message:
>
> CMake Error at bindings/qt_gui/CMakeLists.txt:54 (target_link_libraries):
>   The plain signature for target_link_libraries has already been used with
>   the target "plplotqt".  All uses of target_link_libraries with a target
>   must be either all-keyword or all-plain.
>
>   The uses of the plain signature are here:
>
>    * /usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreMacros.cmake:278
> (target_link_libraries)
>
>
> I used this command in my build directory:
> cmake -DPLPLOT_USE_QT5=ON ../plplot > cmake.txt 2>&1
>
> CMake log files attached.
>
> lubuntu 15.10.
>
> > uname -a
> Linux Dell-XPS-8100 4.2.0-25-generic #30-Ubuntu SMP Mon Jan 18 12:31:50
> UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>
> -Hazen
>
>
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>

Re: [Plplot-devel] Qt5 / cmake error

[Alan W. I. <ir...@be...>]

On 2016-01-21 21:23-0500 Hazen Babcock wrote:

>
> Hello,
>
> As Qt4 is now at least technically no longer supported I thought I might 
> spend some time to see if I could get our PyQt bindings to work with Qt5. 
> However unfortunately I can't even build PLplot with Qt5 due to a cmake 
> error. Any suggestions would be appreciated.
>
> The error message:
>
> CMake Error at bindings/qt_gui/CMakeLists.txt:54 (target_link_libraries):
>  The plain signature for target_link_libraries has already been used with
>  the target "plplotqt".  All uses of target_link_libraries with a target
>  must be either all-keyword or all-plain.
>
>  The uses of the plain signature are here:
>
>   * /usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreMacros.cmake:278 
> (target_link_libraries)
>
>
> I used this command in my build directory:
> cmake -DPLPLOT_USE_QT5=ON ../plplot > cmake.txt 2>&1

Hi Hazen:

If you compare the two target_link_libraries commands on the exact
lines mentioned in the error message, bindings/qt_gui/CMakeLists.txt
uses the PRIVATE keyword, and Qt5CoreMacros.cmake uses no keywords at
all, and apparently from the error message that combination of keyword
signature and plain text signature for target_link_libraries commands
for the same target is not allowed by CMake.

I had success with a build of PLplot against Qt5 some time ago.  But I am pretty
sure that predated May 2015 when "git blame" tells me I introduced
that PRIVATE keyword in bindings/qt_gui/CMakeLists.txt.  So I would
try locally removing PRIVATE from the offending line in
bindings/qt_gui/CMakeLists.txt.  That might introduce some
overlinking issues, but I don't think you have to be concerned with
those.

Also, please follow the advice in the first two lines of cmake.txt,
namely

-- WARNING: CMAKE_VERSION = 3.2.2 is in the range from 3.2 through 3.3.1 which has
    a compromised find ability that was fixed in 3.3.2.  Please upgrade to 3.3.2 or greater.

I suggest trying 3.3.2 instead of exploring 3.4.x territory just yet
because we have a lot of good experience with 3.3.2, and we have little
experience of any kind with 3.4.x.

Anyhow, with the above workaround and CMake-3.3.2, I think you
should likely be able to build PLplot against Qt5, but let me
know if you encounter any further issues.

By the way, Qt4 is virtually CMake-unaware so that CMake has to do
everything for it in house (but in a well-understood and stable way
that virtually always works).  In contrast Qt5 supplies a lot of CMake
support files that help CMake figure out how to build software against
Qt5, but there is a lot of churn on both the CMake side and Qt5 side
on how the two work together. Part of that churn is there are about 4
different build methods of various vintages that are supported for the
two working together.  I chose the most modern of those methods that
was available for our minimum CMake version at the time, but our CMake
minimum version is higher now so I might be able to use a still more
modern build method which might avoid the above issue altogether.
Although I don't have time to explore that possibility any time soon,
it is something to keep in mind for the future.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________

Linux-powered Science
__________________________

Re: [Plplot-devel] Qt5 / cmake error

[Hazen B. <hba...@ma...>]

On 01/22/2016 02:42 AM, Alan W. Irwin wrote:
> I had success with a build of PLplot against Qt5 some time ago.  But I
> am pretty
> sure that predated May 2015 when "git blame" tells me I introduced
> that PRIVATE keyword in bindings/qt_gui/CMakeLists.txt.  So I would
> try locally removing PRIVATE from the offending line in
> bindings/qt_gui/CMakeLists.txt.  That might introduce some
> overlinking issues, but I don't think you have to be concerned with
> those.

Hi Alan, Greg,

Removing the PRIVATE keyword solved the problem, thanks!

>
> Also, please follow the advice in the first two lines of cmake.txt,
> namely
>
> -- WARNING: CMAKE_VERSION = 3.2.2 is in the range from 3.2 through 3.3.1
> which has
>     a compromised find ability that was fixed in 3.3.2.  Please upgrade
> to 3.3.2 or greater.

This was not necessary so I'm just going to stay with my current version 
of cmake for the time being.

-Hazen