need help compiling library...

CharlesHuff · wrote on 30 Oct 2018, 02:34

I downloaded the free sFoundation20 library from Teknic (under clear path stepper motors). it is the source code for linux in a tar format. Teknic gives info for beaglebone platform only, but says library can be used on raspberry. I create a shared library using qtcreator on the raspberry pi 3 itself. I realize it's slower than cross compile. I add existing files to the project by the menu. I struggle with settings and flags until it finally does compile on the raspberry pi 3, but I get 7-800 warnings. I can only find the file "found.o" and not "found.so" that I was expecting? Why do I get so many warnings? Am I using the correct setup? Teknic cannot help me and they say that I should be using the shared rather than the static library. I have tried to do both with no luck. I am very much a novice with Qt Creator. I would be thankful for any advice...

CharlesHuff · 30 Oct 2018, 13:03

After much fiddling with LIBS += and INCLUDE_PATH += ....... I finally found the dot so file and got it to link into my main project. This however did NOT change the major problem with "7-800 warnings" as I still get those. found.so turned out to be found.so.1.0.0, but it needed to be referenced as found.so.1 and I don't really understand why...

I added #include "path_to_found.h" in my mainwindow.cpp and did not increase the error count. Almost 4 am here. long night fiddling with compiler directives. Please, please, please take a look at the sFoundation20 library and give me a hint as to how I may resolve the hundreds of warnings I still have!

Pablo J. Rogina · wrote on 30 Oct 2018, 13:03

@CharlesHuff said in need help compiling library...:

Please, please, please take a look at the sFoundation20 library and give me a hint

You should at least provide a link to the project, or how to download the sources... Help the community help you!!

CharlesHuff · 30 Oct 2018, 21:12

No problem there...
here is a link to my mirror site:

http://briggsassociates.org/src

sorry that I didn't think to do that earlier!

Pablo J. Rogina · wrote on 30 Oct 2018, 21:12

@CharlesHuff I've just unpack the whole Linux_Software.tar into a folder (i.e. sharedlib) and from Qt Creator:

selected New Project / Library / C++ Shared Library
selected the folder sharedlib and click Ok
edited the sharedlib.pro file and added all the required include paths to variable INCLUDEPATH
right click on Sources and selected Add Existing Directories... and chose sFoundation
Remove all the sharedlib.{cpp, h} files added by Qt Creator not needed

Then I built the library (Ctrl+B) (under Linux x86, not RPi) and I ended up with just 4 warnings:

/home/pablo/projects/sharedlib/inc/inc-private/linux/tekEventsLinux.h:113: warning: unused parameter ‘lInitialCount’ [-Wunused-parameter]
CCSemaphore (long lInitialCount = 0,
^
/home/pablo/projects/sharedlib/sFoundation/src-linux/lnkAccessLinux.cpp:312: warning: ordered comparison of pointer with integer zero [-Wextra]
if ( pfd <= 0 )
^
/home/pablo/projects/sharedlib/sFoundation/src-linux/lnkAccessLinux.cpp:321: warning: ordered comparison of pointer with integer zero [-Wextra]
if ( fgets(buf, sizeof(buf), pfd) > 0 )
^
/home/pablo/projects/sharedlib/inc/inc-private/linux/tekEventsLinux.h:113: warning: unused parameter ‘lInitialCount’ [-Wunused-parameter]
CCSemaphore (long lInitialCount = 0,
^

I hope you can replicate this under your RPI board.

My project file (.pro) just in case:

QT       -= core gui

TARGET = sharedlib
TEMPLATE = lib

SOURCES += \
    sFoundation/src/converterLib.cpp \
    sFoundation/src/cpmAPI.cpp \
    sFoundation/src/cpmClassImpl.cpp \
    sFoundation/src/iscAPI.cpp \
    sFoundation/src/lnkAccessCommon.cpp \
    sFoundation/src/meridianNet.cpp \
    sFoundation/src/netCmdAPI.cpp \
    sFoundation/src/netCoreFmt.cpp \
    sFoundation/src/SerialEx.cpp \
    sFoundation/src/sysClassImpl.cpp \
    sFoundation/src-linux/lnkAccessLinux.cpp \
    sFoundation/src-linux/SerialLinux.cpp

INCLUDEPATH += \
    LibINI/inc \
    LibXML/inc \
    LibLinuxOS \
    inc/inc-pub \
    inc/inc-private \
    inc/inc-private/linux \
    inc/inc-private/sFound


unix {
    target.path = /usr/lib
    INSTALLS += target
}

CharlesHuff · wrote on 30 Oct 2018, 22:32

Thanks, this was very helpful....

CharlesHuff · 31 Oct 2018, 20:32

Pablo,
Step 1,2,3,4 i followed ok. Step 5 didn't see any .h file, so i right clicked on Headers, then add existing directory, navigated to sFoundation, clicked on Parse, then clicked Ok. This step added all the .h files (much faster than typing them in by hand!)
I still didn't see anything that seemed to be unneeded by QT? I went ahead and did a qmake, clean all, and build all. I got the same 647 warnings as before.
I installed Qtcreator on the pi itself. Is that why i get warnings? I think the pi is 64 bit, but have read that the Raspbian is still 32 bit? I am using Raspbian Stretch. Should I build the library on Linux Ubuntu? If I do that, will it then work on the Raspbian Stretch? Will it fix the warnings?

Pablo J. Rogina · wrote on 31 Oct 2018, 20:32

@CharlesHuff said in need help compiling library...:

Step 1,2,3,4 i followed ok.
Step 5 didn't see any .h file

if you don't have any .h files by following steps 1-4 something went wrong... Anyway, those steps are not really necessary if you use the .pro file I provided. They were there just to explain how I created such .pro file

I still didn't see anything that seemed to be unneeded by QT? I went ahead and did a qmake, clean all, and build all. I got the same 647 warnings as before.

Please try using the provided .pro file. In Ubuntu x64 I've just got only 4 warnings

I installed Qtcreator on the pi itself. Is that why i get warnings?

How did you installed Qt Creator on the RPi? Did you build it? or just did apt-get install?

I think the pi is 64 bit, but have read that the Raspbian is still 32 bit? I am using Raspbian Stretch.

Raspberry Pi 3 is ARM 64 bit, but Raspbian is just 32 bit as they created just one distribution for all different boards (1, 2, Zero, 3, etc) There are other distributions targeting aarch64 if you like/need that (i.e. Alpine Linux)

Should I build the library on Linux Ubuntu? If I do that, will it then work on the Raspbian Stretch? Will it fix the warnings?

If you plan to build the library in Linux Ubuntu you will need to consider doing cross-compile

Please be aware, that all in all you don't need Qt Creator or Qt framework at all to build this library for ARM architecture.
However, once you do actually build the library you'll be able to use it in a Qt application via Qt Creator if you like.

You may want to check this tutorial about Qt Creator for RPi

CharlesHuff · 31 Oct 2018, 21:26

@Pablo-J.-Rogina said in need help compiling library...:

tutorial

Pablo,
I have a machine with Ubuntu (not sure how to tell if it's x64)?
Will the compiled library on Ubuntu work on the Raspberry?
I installed the Qt creator:
sudo apt-get install qt5-default
sudo apt-get install qtcreator
uninstall a plugin, "Remote Linux" from "About Plugins...", which
is under "Help" menu
find "Remote Linux" and you need to uncheck it and restart QtCreator.
setup the path of gcc and gdb from "Options..." under "Tools" on menu.
Go to "Build & Run" and click "Tool Chains" tab. Click "Add" and add "GCC".
Fill out the form: "Compiler path" and "Debugger".
you can figure it out by a command "whereis gcc, whereis gdb".
set the path of make from the tab "QtVersions".
Make sure you see "Desktop" on the bottom after you set the path of "qmake".
I don't think I need cross compile. I am trying to go the easiest way. My program will be only a couple of screens with buttons.
Cross compile on Mac does not seem to be possible... but I came closer on Ubuntu. I never really got cross compile to work right so I decided to trade ease of compile for speed and opted to do it all on Raspberry...

JonB · wrote on 31 Oct 2018, 21:26

@CharlesHuff

I have a machine with Ubuntu (not sure how to tell if it's x64)?
Will the compiled library on Ubuntu work on the Raspberry?

Umm, I don't think so.

CharlesHuff · 1 Nov 2018, 11:52

Ignoring the 600 plus warnings seems to work ok. I don't see them when I link the dynamic library into my project (I know they are still there, but it's working).

Is there a good tutorial that could show me the way to use the axis.h and axis.cpp as a class in Qt Creator? I cannot simply call the functions via signals and slots as I hoped. I guess I need to somehow declare the "SysManager myMgr;" as "global" in scope. sorry I am such a newbie...

Thanks again Pablo....

Pablo J. Rogina · wrote on 1 Nov 2018, 11:52

@CharlesHuff said in need help compiling library...:

, but it's working).
...
Is there a good tutorial that could show me the way to use the axis.h and axis.cpp as a class in Qt Creator?

Please don't bury a completely different question in this post. If you think this issue is working for you, go and mark the post as solved and then open another post with the question for the chart...

CharlesHuff · wrote on 1 Nov 2018, 15:50

Yes Sir, I marked it solved. Many parts of my question are solved and working. I think the warnings are due to the change to Raspberry pi format, but I am not sure of that. Maybe now I can gain enough knowledge to actually use this library...

Thank you again.

CharlesHuff · wrote on 8 Nov 2018, 04:39

I followed your instructions to the letter and got the library built on the raspberry... yay!

I decided to try to build the same library on linux 'ubuntu' because it's so slow on the raspberry pi 3. I didn't yet get to the cross compile because the library does not compile. Qt gives the same fatal error twice: Ordered comparison between pointer and zero: char * and int.....

I am running apt-get update and apt-get upgrade now. Guess I will go back to the raspberry...

CharlesHuff · wrote on 8 Nov 2018, 16:46

Errors in compile.....
MN_EXPORT cnErrCode MN_DECL infcGetHubPorts(std::vectorstd::string &comHubPorts)
{
comHubPorts.clear();
FILE pfd = popen( "ls /dev/ttyXRUSB", "r" );
if ( pfd <= 0 )
{
throw std::runtime_error( "Command or process could not be executed." );
}
while ( !feof(pfd) )
{
char buf[ 1024 ] = {0};
if ( fgets(buf, sizeof(buf), pfd) > 0 )
{
std::string str(buf);
// TODO: check the VID/PID of the device using udevadm/libudev to
// verify that this is a Teknic SC4-Hub (vid=2890, pid=0213)
comHubPorts.push_back(str.substr(0, str.length()-1));
}
}
pclose( pfd );
return MN_OK;
}
ERRORS FIXED BY:
MN_EXPORT cnErrCode MN_DECL infcGetHubPorts(std::vectorstd::string &comHubPorts)
{
comHubPorts.clear();
FILE pfd = popen( "ls /dev/ttyXRUSB", "r" );
if ( !pfd )
{
throw std::runtime_error( "Command or process could not be executed." );
}
while ( !feof(pfd) )
{
char buf[ 1024 ] = {0};
if ( fgets(buf, sizeof(buf), pfd) != NULL)
{
std::string str(buf);
// TODO: check the VID/PID of the device using udevadm/libudev to
// verify that this is a Teknic SC4-Hub (vid=2890, pid=0213)
comHubPorts.push_back(str.substr(0, str.length()-1));
}
}
pclose( pfd );
return MN_OK;
}
If you use this fix, I must warn that I have no idea if it is the CORRECT way to fix the compile error.