I want to use a Qt app on a tiny210 device.
I installed Qt ( qt-everywhere-opensource-src.4.8.5 ) downloaded from here. I managed to compile a simple application for use on tiny210. The problem is that now when I try to run the app on the device, I get the following errors:
libc.so.6: version 'GLIBC_2.15' not found (required by libQtCore.so.4)
libc.so.6: version 'GLIBC_2.15' not found (required by libQtNetwork.so.4)
There is a libc.so.6 in /lib/ on the target device, but it is version 2.11.
I should mention that before getting those errors I also got errors for not having libQtCore.so.4, libQtNetwork.so.4 and libQtGui.so.4. I fixed those errors just by copying the compiled libraries from my host PC to the device.
First question is: Would there have been a better way to provide the needed libraries, or copying them is fine?
Second question is: How can I get over the errors mentioned above?
EDIT : I've read something about building it static, but I am not sure how, and what are the downsides of this.
EDIT2 : I managed to get over the above errors thanks to artless noise's answer, but now I get: error loading shared libraries: libQtGui.so.4: cannot open shared object file: No such file or directory.
The issue is the cross-compiler (apt-get install gcc-arm-linux-gnueabi) is ARM based and this cross compiler has a newer glibc than on the ARM device. You can copy the libc from the cross compiler directory to your ARM device. I suggest testing with LD_LIBRARY_PATH, before updating the main libraries. Use ls /var/lib/dpkg/info/*arm-linux*.list to see most packages related to the ARM compiler. You can use grep to figure out where the libraries are (or fancier things like apt-file, etc).
Crosstool-ng has a populate script, but I dont see it in the Ubuntu packages; it is perfect for your issue. If it is present on your Debian version, I would use it.
The glibc 2.15 is backwards compatible with the glibc 2.11 which is currently on your system. Issues may arise if the compiler was configured with different options (different ABI); however if this is the case, you will have many issues with your built Qt besides the library. In this case, you need to find a better compiler which fits your root filesystem.
So to be clear, on the target
mkdir /lib/staging
cp libc.so-2.15 /lib/staging
cd /lib/staging
ln -s libc.so-2.15 libc.so
LD_LIBRARY_PATH=/lib/staging ls # test the library
You may have to copy additional libraries, such as pthread, resolv, rt, crypt, etc. The files are probably in a directory like sysroot/lib. You can copy the whole directory to the /lib/staging to test it. If the above ls functions, then the compilers should be ABI compatible. If you have a crash or not an executable, then the compiler and rootfs may not be compatible.
Would there have been a better way to provide the needed libraries, or copying them is fine?
Copying may be fine as per above. If it is not fine, then either the compiler or the root filesystem must be updated.
How can I get over the errors mentioned above?
Try the above method. As well, you maybe able to leave your root filesystem alone. Set-up a shadow directory and use chroot to run the Qt application with the copied files as another solution. To test this, make a very simple program and put it along the compiler libraries in a test directory, say /lib/staging as above. Then the test code can be run like,
$ LD_LIBRARY_PATH=/lib/staging ./hello_world
If this doesn't work, your compiler and the ARM file system/OS are not compatible. No library magic will help.
I've read something about building it static, but I am not sure how, and what are the downsides of this.
See Linux static linking is dead. I understand this seems like a solution. However, if the compiler is wrong, this won't help. The calling convention between OS, libraries and what registers are saved by the OS will be implicit in the compiled code. You may have to rebuild Qt with -softfp, etc.
Related
I've a question regarding compilation of a dependency (namely poppler). Poppler is a dependency of my app which is an electron app.
It's working fine on windows (because npm package node-poppler ships the poppler windows build). But on a mac / linux I have to install poppler dependencies by myself (e.g. via homebrew) and then also everything works well.
Now I want to ship the app including poppler and therefore I've started to compile poppler by myself. This is working particularly and all dependencies that it needs I've added via homebrew and finally the build is running and it compiles successfully after long try and error.
But my problem now is, hat if I remove all homebrew dependencies after I've compiled poppler it stops working because there are "links ? (dont know the exact term)" to these dependencies.
e.g.
cmd: './extlib/darwin/poppler/poppler-gitlab/cmake-build-release/utils/pdfinfo -v',
stdout: '',
stderr: 'dyld[93398]: Library not loaded: /usr/local/opt/fontconfig/lib/libfontconfig.1.dylib\n' +
' Referenced from: <0062B574-27F1-35D4-BEF8-81E2F2B5EEDB> /Users/bernhard´/Coding/Sides/backend/extlib/darwin/poppler/poppler-gitlab/cmake-build-release/libpoppler.126.0.0.dylib\n' +
" Reason: tried: '/usr/local/opt/fontconfig/lib/libfontconfig.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/usr/local/opt/fontconfig/lib/libfontconfig.1.dylib' (no such file), '/usr/local/opt/fontconfig/lib/libfontconfig.1.dylib' (no such file), '/usr/local/lib/libfontconfig.1.dylib' (no such file), '/usr/lib/libfontconfig.1.dylib' (no such file, not in dyld cache)\n"
After a lot of reading I've found out that it might be possible to compile it static (even unsure if I'm using the right term here).
I'd like to know what I neet to do, that I can ship the app and what's required, to build poppler in a way that is has no dependencies anymore or has it's dependencies in a place that I have control over and can ship it with my app.
Actually I'm building using following CMAKE options:
-G Ninja -DCMAKE_BUILD_TYPE=Release -DC_MAKE_PROGRAM=/Applications/CLion.app/Contents/bin/ninja/mac/ninja -DCMAKE_FIND_FRAMEWORK=LAST -DCMAKE_VERBOSE_MAKEFILE=ON -DPOPPLER_QT5=OFF -DPOPPLER_ENABLE_CMS=none -DPOPPLER_ENABLE_SPLASH=OFF -DPOPPLER_ENABLE_UTILS=OFF -DPOPPLER_ENABLE_GLIB=OFF -DPOPPLER_ENABLE_CPP=OFF -DPOPPLER_ENABLE_XPDF_HEADERS=OFF -DPOPPLER_ENABLE_ZLIB=OFF -DPOPPLER_ENABLE_LIBCURL=OFF -DPOPPLER_ENABLE_LIBSYSTEMD=OFF -DPOPPLER_ENABLE_OPENJPEG=OFF -DPOPPLER_ENABLE_TIFF=OFF
Thanks for any help and sorry for maybe misusing terms as I'm mostly a frontend dev.
You have to compile your program with an RPATH option for your shipped libraries. The reason why you can't run it without those deleted dependencies is simple. (Regarding RPATH check out the ld man pages.)
Your application seems to be linking against the same version of the dependency as the one in your homebrew directory. Thus this shared object is compatible with your executable.
Your linker is only configured to look for the shared objects within certain directories. Thus when you delete the directory, your linker doesn't know where to find these shared objects anymore (because they do not exist).
On linux distributions you could run your application for example with: LD_LIBRARY_PATH=./path_to_your/library/ && ./your_executable. And it would suddenly work.
RPATH solves this by telling the linker where to look for the linked dependencies.
I would like to give you a general warning here. This is not the way to go when it comes to shipping your executable (and especially libraries) on different distros. It's better to make a package, using the available -dev packages for the given distribution. - Because otherwise you are slowly introducing dependency hell for the developers who wish to use it!
To answer your question regarding static linking: You will increase the size of your executable, so keep that in your mind if you wish to take this path instead
I am trying to compile a modelling program in Cygwin using either a gfortran or g95 compiler. I have installed both compilers, but when I go to configure the program, it checks for the compilers and does not find then (error: Fortran compiler cannot create executables). I am new to Cygwin-- I suspect it is something with how/where I installed the compilers...Any ideas?
Thank you,
L.
For me, it's more helpful to have executable code to go through the process, so I'm going to put some in. This is addressing your concern,
I suspect it is something with how/where I installed the compilers...
because the installation from apt-cyg should be helpful in letting the system know where to look for the compilers. I'm also addressing a possible linkage issue.
bballdave025#MY-MACHINE /cygdrive/c/bballdave025
$ apt-cyg install gcc-fortran libgfortran5
If you don't have apt-cyg yet, follow these instructions from another answer.
# Get to where your setup executable lives.
# This is what you used to install Cygwin the first time.
# Note that mine is for the 64-bit version, and that
# I keep mine in C:\cygwin64. Your path might be
# different. You also might need to re-download
# The setup executable from Cygwin.
$ cd /path/to/setup_install/setup_x86-64.exe -q -P wget
$ wget https://raw.githubusercontent.com/transcode-open/apt-cyg/master/apt-cyg
$ chmod +x apt-cyg
$ mv apt-cyg /usr/local/bin
The libgfortran5 (or a more recent version, if available when you search) might be necessary. Here's why I think this might be the case.
bballdave025#MY-MACHINE /cygdrive/c/bballdave025
$ man gcc | grep -A 3 "[ ]*[-]l[ ]\{0,2\}library$"
-llibrary
-l library
Search the library named library when linking. (The second
alternative with the library as a separate argument is only for
POSIX compliance and is not recommended.)
(Note that I haven't included some parts of the result that aren't useful and can be fixed by prefixing the command with MANWIDTH=160, cf here.)
There is a little more detail and a little different result from the answer to a question about the lib prefix on files:
You can name a library whatever you want, but if you want gcc's -l flag to find the right one, you need to name it the way that link describes. For example, gcc -o myapp myapp.c -lm, [w]ill compile myapp.c, link the resulting object with libm.a, and output an executable called myapp. These days, there might be a more complicated search path involving dynamic library names, etc., but you should get the basic idea from this example. [In addition, you can look at this section f]rom the gcc man page:
-l library ...
... surrounds library with lib and .a and searches several directories.
The basic reason for all of that info is this: it is very possible that, in order to link with the gfortran library, you need to have installed a package named something like libgfortran. I don't know for sure how this works, especially with the Cygwin man page being slightly different, but it's worth a try. The likely extra thing you would need in this case is something like
apt-cyg install libgfortran
or
apt-cyg install libgfortran5
Here's some helpful info on how I found what to install. When I had a similar problem, I went to the Cygwin package search, but I only got three entries with three versions of netcdf-fortran
(archived). I wanted gfortran, so I kept looking
I found a great gfortran answer in this SO answer. With that answer, I went back to the Complete Cygwin Package List, armed with my trusty Ctrl + F, since I knew there were packages different from what came back from the search. The complete list had
cygwin64-gcc-fortran GCC for Cygwin 64bit toolchain (Fortran)`
gcc-fortran GNU Compiler Collection (Fortran)
and entries for libgfortran.
Hopefully some of this information will be helpful, or at least educational.
This problem is common for beginners with autotools. It can be:
missing libraries; this can be missing libraries for your project or compiler/system libraries, like libgfortran or similar for g95.
autotools can not detect your compiler;
dynamic libraries problem; runtime path to the dynamic libraries not set. See LD_LIBRARY_PATH for linux environment.
cross-compiling problem, I do not know much about cygwin but that can be an issue. I am not expert of cross-compiling either. It can also be another situation that I am not aware of.
I ran into the 1st and 3rd situations.
Approaches of solutions.
make sure you can manually compile and run a simple hello world program. Install the missing libraries if necessary. Also make sure that you can link your hello world program against the same libraries used by your modelling program, this last statement could lead you to the 3rd situation.
add the path to your compiler to the PATH variable or similar variable in cygwin. Or explicitly give the full path to your compiler to configure.
add the path to your libraries to the runtime libraries path LD_LIBRARY_PATH for linux environment or similar variable in cygwin. In one of my cases, the problem was that the test program that autotools uses to test the compiler could not run. It was successfully compiled but could not run. I installed all the libraries that my project uses in a path that was not included in library path. What happened was that the path to those libraries were set in the configure.ac or makefile.am so that the compiling was OK. But the running of the test program included in configure could not find them. This is a problem mostly for dynamically linked libraries. Adding the path to my .so to the LD_LIBRARY_PATH solved the problem.
well, I can not really help. The only solution that I can suggest is to install a linux system (dual boot or virtual machine) if you know how to do it, because I will not be there to help.
The following link can also help.
Let's say I have created and compiled a simple program using the MinGW 64 (g++ compiler). Running this program on my computer and looking in Process Explorer for what DLL files the program is using I find (among many others):
libgcc_s_seh-1.dll
libstdc++6.dll
libwinpthread-1.dll
These are the only ones that reside under my MinGW installation folder. The rest of the DLL files used reside under C:\Windows.
Question 1:
Are the MinGW DLL files the MinGW C++ runtime libraries (so to speak)? Do they serve the same purpose as for example msvcrXXX.dll (XXX = version of Microsoft runtime library).
Question 2:
If I want to run the application on a different computer which does not have MinGW installed, is it sufficient to include those DLL files listed above (i.e. placing them in the same folder as my executable) to have it run on the other computer (we assume the other computer is also a 64-bit Windows machine). If yes, does this mean we basically ship the MinGW C++ runtime with our executable. If no, why?
libstdc++6.dll is the C++ standard library, like you said.
libwinpthread-1.dll is for C++11 threading support. MinGW-W64 has two possible thread variants: Either use the native Windows functions like CreateThread, but C++11 stuff like std::thread won´t be available then; or include this library and use the C++11 classes (too).
Note that to switch the thread model, you´ll need to reinstall MinGW. Just removing the DLL and not using the C++11 stuff won´t work, the DLL will be required nonetheless with your current install.
libgcc_s_seh-1.dll is something about C++ exception handling.
Yes, it should be sufficient to deliver the DLLs too
(or use static linking and deliver only your program file).
For complicated projects where you're not exactly sure which DLL files need to be included to distribute your application, I made a handy dandy Bash script (for MSYS2 shells) that can tell you exactly what DLL files you need to include. It relies on the Dependency Walker binary.
#!/usr/bin/sh
depends_bin="depends.exe"
target="./build/main.exe" # Or wherever your binary is
temp_file=$(mktemp)
output="dll_list.txt"
MSYS2_ARG_CONV_EXCL="*" `cygpath -w $depends_bin` /c /oc:`cygpath -w $temp_file` `cygpath -w $target`
cat $temp_file | cut -d , -f 2 | grep mingw32 > $output
rm $temp_file
Note that this script would need to be modified slightly for use in regular MSYS (the MSYS2_ARG_CONV_EXCL and cygpath directives in particular). This script also assumes your MinGW DLL files are located in a path which contains MinGW.
You could potentially even use this script to automatically copy the DLL files in question into your build directory as part of an automatic deploy system.
You may like to add the options -static-libgcc and -static-libstdc++ to link the C and C++ standard libraries statically and thus remove the need to carry around any separate copies of those.
I used ntldd to get a list of dependencies.
https://github.com/LRN/ntldd
I'm using msys2 so i just installed it with pacman. Use that and then copy all the needed dependencies
There are several major challenges to distributing compiled software:
Compiling the code for all target processors (remember, when it comes to compiled code, you need to produce separate downloads/distributions for each type of instruction set architecture).
Ensuring that the builds are reproducible, consistent, and can be easily correlated with a specific version of the code (and versions of the dependencies).
Ensuring that the build output is self-contained and includes all of its dependencies within it (so that it is not dependent on any other installations that happen to exist on just your system).
Making sure that your code is built and distributed regularly, with updates distributed automatically so that -- in the event of security issues -- you can push out new patched versions.
For convenience and to increase reach, it is nice for non-savvy users to have a prebuilt version that they can install. However, I would recommend sharing the source code as a first step.
Most of these requirements are fairly non-trivial to hit and often require automating not only build process, but also automating the instantiation / configuration of VMs in which the build should take place. However, there are open source projects that can help... for example, check out Gitian.
In terms of bullet point #3, the key thing here is to use static linking... while this does make the binary you distribute much larger (because its dependencies are now baked into the output), it also makes your binary isolated from the version of the libraries on the system (avoiding "dependency hell").
Point #4 is very tricky, but thankfully there are also opensource tools to help here, as well such as cloudup, which provides a way to add auto-updating capability to your application distribution.
I'm building my program on my computer, on which libtiff.so -> libtiff.so.5.
And then pushing the builds on another machine on which libtiff.so -> libtiff.so.4.
At runtime, my program exists : « error while loading shared libraries: libtiff.so.5: cannot open shared object file: No such file or directory ».
I cannot upgrade the other machine, and I would like to avoid compiling on a virtual machine (with the same linux version than the executing machine). Therefore, I would like to force the compiler to use the libtiff.so.4 instead of libtiff.so.5.
I have libtiff.so.4 installed on my computer (as well as libtiff.so.5). How can I force the linkage with this version instead of the newer version. I thought about moving the libtiff.so -> libtiff.so.4, but I'm afraid of breaking my system if it needs the latest version (apt-get purge libtiff5 gives an error because some other package needs it).
Is it possible to link with an older (installed) version of a library? If yes, how?
And is it harmfull to change the symbolic link of libtiff.so to the older version? If not, will it solve my issue?
You can use this syntax to link to a specific version of a library:
gcc [other options] -l:libtiff.so.4
You do not need to specify a path; the usual directories are searched in order to find the library.
Note: as Michael Wild mentioned, you should have the header files for that version installed instead of the newest ones.
As others have mentioned, you can force the linker by specifying the full versioned name, or even the absolute path.
However, I would strongly advice against doing so. The problem is, that the installed headers correspond to the newer version of the library. If there have been API/ABI-breaking changes between these library versions, the program might work, crash intermittently, or if you're lucky, not work at all.
Instead you should temporarily install the development package that corresponds to the libtiff.so.4 library. If on Debian/Ubuntu or similar, this would be the libtiff4-dev package.
Specify the full path to the .so: instead of -ltiff pass /lib64/libtiff.so.4 to the linker.
You see that error when application is running. So you can either stop your application and then exrract your library tar file. Or, force to link the lib file to the newer version after you extract. In second case, you will use something like:
ln -fs libversionname libfile
Example:
ln -fs libomyapp.1.1.3 libomyapp.lib
This links your libomyapp.lib to the version specified. This can be your older vsersion or your newer version.
But as said, best way to work is to bring down your application to properly match to the expected lib functionality to work without errors or issues.
My program is written in C++, using GCC on Ubuntu 9.10 64 bit. If depends on /usr/lib64/libstdc++.so.6 which actually points to /usr/lib64/libstdc++.so.6.0.13. Now I copy this program to virgin Ubuntu 7.04 system and try to run it. It doesn't run, as expected. Then I add to the program directory the following files:
libstdc++.so.6.0.13
libstdc++.so.6 (links to libstdc++.so.6.0.13)
Execute command:
LD_LIBRARY_PATH=. ./myprogram
Now everything is OK. The question: how can I write installation script for such program? myprogram file itself should be placed to /usr/local/bin. What can I do with dependencies? For example, on destination computer, /usr/lib64/libstdc++.so.6 link points to /usr/lib64/libstdc++.so.6.0.8. What can I do with this?
Note: the program is closed-source, I cannot provide source code and makefile.
If you're working on Ubuntu, making a .deb (Debian Package) seems to way to go. Here is a link to get you started.
Your package will state it depends on some other packages (typically the packages that includes libstdc++.so.6.0.13 - i guess the package name is something like libstdc++) and dependencies will be installed when you install your own package using dpkg -i <yourpackage>.deb.
Afterwards, you'll be able to uninstall it using dpkg -r <yourpackage>.
Anyway, never ship such standards files with your own archive. Dependencies exists for this exact purpose.
Hope it helps.
The real problem is that you try to install a binary that use newer versions os common libraries that the ones available on Ubuntu 9.10. The best option should be to make a specific target for the old Ubuntu 7.10 an compile it with the old libraries (that's a backport).
Then you should make two (or more) .deb packages, one for Ubuntu 9.10 and one for Ubuntu 7.10.
Another possibility is to continue doing what you are doing now : set LD_LIBRARY_PATH to point to the desired version of libstdc++ and other necessary libraries. You just set this environment variable in a launcher shell script. In you script you check if the new libraries are available or not and you set your LB_LIBRARY_PATH (say to /usr/local/lib/myprogram/) only if needed. But as others poster pointed out : that's a very bad practice. Anyway, never try to put these provided libraries at their standard place in Ubuntu 9.10, you would risk broking the target system and causing update problems for users or your program if these libraries are officially backported someday.
But if you choose to include your own set of system libraries there is still another way to go than the above one: just link these libraries statically. If a program is the only user of a library as it will probably be in the above scenario you'll lose all advantages of using a shared dynamic library, then why bother with using it at all ? And with stacically linked libraries you won't have to install them.