I'm trying to create packages for some robot controller code that will support different architectures, such as i386 and armhf (for Raspberry Pi). I don't know how Debian intends this to be done. Is there a way to create a single .deb package that contains both binaries? Or must I create a separate .deb package for each architecture, which I do know how to do?
In the latter case, if I give the two packages the same package name, I can't put them both in the same repository, but if they have different names, users will have to specify which package they want to install using apt-get. Is there a solution to this problem?
You need to have different binary packages for different architectures unless what you're packaging is interpreted and not compiled.
If the package you're making is compatible with all architectures, then the Architecture: field of your debian/control file must be any. This is telling you that the package can be built in any Debian supported architecture. Then you'll just compile it and cross-compile it to i386 and armhf.
About your second question, you can. In fact, this is how is done in the official Debian repositories. The binary packages have a suffix in the file name containing the architecture. See this example. When users install your package, they won't need to specify the architecture as it's automatically detected.
Related
I'm starting to use virtual environments. I'm a little unclear on how to efficiently work with them and globally installed packages. For example, if I want to use Numpy in my project within a virtual environment, does it make sense to install Numpy into the environment for the project? I'm assuming no, since I will then have to install Numpy many times for different projects. So maybe I need to set environment $PYTHONPATH for each project? Is it correct that there should be a separate $PYTHONPATH variable for each project? Or is there some other way to manage this correctly? Thanks for any recommendations you may have to offer.
I have personally adopted the habit of making a virtual environment (venv) for each significant project, plus a default venv in my home directory. This might help you also. Python venvs are cheap!
I name each venv the same as my python project.
Bonus tip: Imagine a project called blah, then there would also be a venv at ~/venvs/blah. A bash alias could be defined called blah that activates the venv and cds into the project directory:
alias blah="source ~/.venv/blah/bin/activate; cd ~/work/blah"
Now you type blah at a shell prompt and you are working on that project. Boom!
I use ActiveStates TCL version 8.6.0.0 for Windows x64.
In a script I call:
package require tcom
Tcom is included in the installation but I get the following error:
couldn't load libary "C:/TCL/lib/tcom/tcom.dll": Invalid argument while executing
"load C:/TCL/lib/tcom/tcom.dll"
("package ifneeded tcom 3.9" script)
invoked from within
"package require tcom"
Does anyone understand whats actually missing? C:/TCL/lib/tcom/tcom.dll is installed on my system, so what is the "invalid argument" ?
This appears to be a 32-bit/64-bit issue. You can't mix different bit-sizes within the same process† and you may well have installed a 64-bit build of ActiveTcl 8.6.0.0 under the belief that matching the size of the build and the system architecture is a good idea. Alas, this is not the case. ActiveTcl 8.6.0.0 for 64-bit Windows, for commercial reasons‡, requires an extra product key to access their 64-bit builds of external packages. But you've got the package installed anyway (perhaps from a previous installation of ActiveTcl?) and that appears to be a 32-bit build.
The misleading error from using the wrong size of binary library build is unfortunate (a relatively minor bug stemming from the subtle differences between Windows and POSIX and how Tcl handles the mapping between the two) but I'd bet that's it.
The easiest fix is to:
Uninstall all copies of ActiveTcl that you've got installed, then
Ensure that your C:\Tcl directory really is deleted, and then
Install the 32-bit build of ActiveTcl 8.6.0.0 (which works just fine on Win64-based systems like 64-bit Windows 7 and Windows 8). Once you've done that, you
Use teacup update to get a full set of packages installed and you should get Tcom working.
†Except on ARM with extra trickiness, which doesn't apply here.
‡I'm not going to try to justify them; it's their decision, not mine.
I've built a service and I'd like to distribute it via rpm and should work on different fedora releases. Since it is a service it should be integrated with the system so it is possible to do:
$ service myapp start
The problem is that fedora used upstart in releases 9 to 14 and systemd from 15 and up. I can do this for both systems, but I'm not sure how to package it correctly.
I think I have to build different rpms for the fedora releases. The only thing that differs is a few files to be copied to different locations.
How should I handle the differences? In the .spec-file or Makefile? Or should I use two different .spec-files?
Do it in the spec file. Use separate sources for the upstart and systemd scripts, and include the appropriate script based on the version of Fedora being built on. So, single spec file to handle both cases.
Hi all I have installed buildroot toolchain and am able to compile simple "Hello World" program which runs on uClibc based chroot. However I am confused how to do so for programs that use ./configure as how to ask it to use the uclibc based toolchain and not the glibc based toolchain present in my system.
My OS is Fedora and it is i386 based machine.I want to compile programs using uClibc for the same platform.
buildroot contains the package directory where there are numerous examples how to do it
Just set CC=PATH_TO_BUILDROOT_UCLIBC_GCC etc.
And you don't need to use chroot:
xxx/buildrootxxx/output/host/bin/xxxxx-gcc works fine, it would search the headers and libs in its own directory (like xxx/buildrootxxx/output/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/*)
I compiled MySQL++ with no issues. When I launched some of the executables (resetdb.exe and simple1.exe) they suggest to run to test if the installation has been successful, the first error I got was that libmysql.dll was missing.
Adding its path to the PATH environment variable did not fix the problem, even after launching a new command prompt; I had to copy the DLL in the directory where MySQL++ executables are.
Now the DLL is found, but I get this error:
simple1.exe - Application error
The application was unable to start correctly (0xc000007b).
Click OK to close the application.
even launching from the command line, I get no more information than these.
Thank you for any help!
MySQL 5.5 -
MySQL++ 3.0.9 -
Windows 7 64 bits -
MINGW32 -
GCC 4.4.0
0xC000007B is a Windows error that means the executable is corrupted. It could refer either to simple1.exe or to one of the DLLs it's linking against.
Some reasons this could happen:
You're mixing toolchains in an incompatible way. In your case, you may have built simple1.exe using pieces built by MinGW GCC and pieces built by Visual C++. MinGW should be compatible with any pure C DLL built by Visual C++, including the MySQL C API DLL. However, you may have other pieces interfering. MinGW isn't compatible with VC++ at the C++ level, but then, it shouldn't have linked at all if this were your problem.
You didn't follow the MySQL C API import library build steps in README-MinGW.txt. You either missed a step, or skipped it entirely and are trying to use the import library that shipped with MySQL.
In your previous gyrations, you ended up with a corrupt object file, which got linked in. Try saying make clean all at the top level of MySQL++ to force a complete rebuild.
You're mixing versions of MySQL or MySQL++. If you have more than one version of each on the system, make sure you're consistent in their use. That is, build the C API import library from the same DLL you run the programs against, use exrun.bat to run the examples to ensure you're using the just-built version of the MySQL++ DLL instead of another you have in your PATH, etc.
Additionally, I note that you're using an older version of MySQL++. If you were on Linux, I could understand that as some distributions still ship with 3.0.9. But since you have to build MySQL++ from source with MinGW, I don't see why you're not using 3.1.0. Did you get a binary build from somewhere?
As for your PATH problem, did you restart the MinGW shell after doing this? PATH updates don't affect running programs; they keep the value they saw when they started.