Very long project build times after including QCustomPlot

lukutis222

I do not know where it is located. It feels like that this file does not exist in my computer. I use software called "everything" to find files. It works much better than windows search.

Also, when you say "in the example pro" file. Are you refering to sharelib-usage.pro? Because I am trying to build sharelib-usage.pro and it is as following:

#
# Example project that uses QCustomPlot as a shared library
#
# The compiled shared library file(s) must be in the project directory.
# On Unix, set LD_LIBRARY_PATH to "." before launching the compiled application
# unless the library files are installed in one of the library locations (e.g. /usr/lib)
#
# Note that the qcustomplot.h header should not be added to the project file in the
# HEADERS variable, but only included in your source files with #include.
#

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport

greaterThan(QT_MAJOR_VERSION, 4): CONFIG += c++11
lessThan(QT_MAJOR_VERSION, 5): QMAKE_CXXFLAGS += -std=c++11

TARGET = sharedlib-usage
TEMPLATE = app

# Tell the qcustomplot header that it will be used as library:
DEFINES += QCUSTOMPLOT_USE_LIBRARY

# Link with debug version of qcustomplot if compiling in debug mode, else with release library:
CONFIG(debug, release|debug) {
  win32:QCPLIB = qcustomplotd2
  else: QCPLIB = qcustomplotd
} else {
  win32:QCPLIB = qcustomplot2
  else: QCPLIB = qcustomplot
}
LIBS += -L./ -l$$QCPLIB

SOURCES += main.cpp

jsulm

@lukutis222 said in Very long project build times after including QCustomPlot:

I do not know where it is located

It should be located in the build folders you posted before.
And the names of libraries on Linux/UNIX systems start with lib not l. So, libqcustomplot*

lukutis222

@jsulm

Thanks for helping me.

1. Since I am on windows, why does it say that Iqcustomplotd2 is missing instead of libqcustomplot2d?
2. In the build folders that I have posted before inside debug or release folder (I am not sure if there is any difference), I see the following files:

3. I have placed all those build files inside sharedlib-usage folder:

I assume that everything should be ok here right? I just need to tell my project to look for libqcustomplot instead of iqcustomplot? (After placing those files, the same error persists)

jsulm

@lukutis222 said in Very long project build times after including QCustomPlot:

Since I am on windows, why does it say that Iqcustomplotd2 is missing instead of libqcustomplot2d?

It says it can't find -lqcustomplotd2. -l parameter is used to tell the linker to link the lib following -l, so qcustomplotd2 in your case.
You are using relative path to specify the folder to search for libs (-L./). Please check whether the folder passed to linker is correct (you can post the whole linker call here, above you only posted part of it).

lukutis222

@jsulm

I still didint manage to find a solution for this..

I assume you want to see Compile Output:

09:51:38: Running steps for project sharedlib-usage...
09:51:38: Configuration unchanged, skipping qmake step.
09:51:38: Starting: "C:\Qt\Tools\mingw1120_64\bin\mingw32-make.exe" -j16
C:/Qt/Tools/mingw1120_64/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory 'C:/Users/petrikas.lu/Desktop/WORK/QT/QCustomPlot-sharedlib/qcustomplot-sharedlib/build-sharedlib-usage-Desktop_Qt_6_4_0_MinGW_64_bit-Debug'
g++ -Wl,-subsystem,windows -mthreads -o debug/sharedlib-usage.exe debug/main.o -L. -lqcustomplotd2 C:/Qt/6.4.0/mingw_64/lib/libQt6PrintSupport.a C:/Qt/6.4.0/mingw_64/lib/libQt6Widgets.a C:/Qt/6.4.0/mingw_64/lib/libQt6Gui.a C:/Qt/6.4.0/mingw_64/lib/libQt6Core.a -lmingw32 C:/Qt/6.4.0/mingw_64/lib/libQt6EntryPoint.a -lshell32  
C:/Qt/Tools/mingw1120_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lqcustomplotd2
collect2.exe: error: ld returned 1 exit status
mingw32-make[1]: *** [Makefile.Debug:68: debug/sharedlib-usage.exe] Error 1
mingw32-make[1]: Leaving directory 'C:/Users/petrikas.lu/Desktop/WORK/QT/QCustomPlot-sharedlib/qcustomplot-sharedlib/build-sharedlib-usage-Desktop_Qt_6_4_0_MinGW_64_bit-Debug'
mingw32-make: *** [Makefile:45: debug] Error 2
09:51:38: The process "C:\Qt\Tools\mingw1120_64\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project sharedlib-usage (kit: Desktop Qt 6.4.0 MinGW 64-bit)
When executing step "Make"
09:51:38: Elapsed time: 00:00.

jsulm

@lukutis222 said in Very long project build times after including QCustomPlot:

-L. -lqcustomplotd2

This is your problem: you put the lib into your project folder but tell linker to search in current folder which is build folder when your app is being built.

JonB

@lukutis222
For -lqcustomplotd2 to work:

You should have a file named libqcustomplotd2.a somewhere. I can see two of them in your screenshots? One in ...\build-...-Debug\debug and one copied to sharedlib-usage, right?
The linker must be able to find that directory via a -Ldirectory-path argument. You seem to have -L.. I do not know what the directory referred to via . ("current directory") is. I suspect it's not right.

I see @jsulm has just commented on this. Either move the file to the build folder or change the -L. to refer to the right directory. I am confused by the paths you show in your screenshots. I would try

-L..

first for your case. However, I don't actually think that is right for you. If that does not work try

-L../sharedlib-usage

which I think is what you are actually showing you need?

lukutis222

@jsulm
@JonB

Thanks for help.

I was following the instructions that came with the library. It says:

  - Copy all created library/softlink files from the previous step to the sharedlib-usage directory

but it does not seem to make any sense.

Copying all files to build folder seems to work fine but does not make any sense. If I clean the project the files will be deleted and I will have to manually copy them to build folder again.

I dont fully understand what was the library owner reasoning for using:

#LIBS += -L./ -l$$QCPLIB

JonB

@lukutis222 I wrote in my previous what I suggest you do.

lukutis222

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