Debian – How to recompile a Debian package with -Os

compilingdebiangcc

There are a few larger programs I am interested in compiling with -Os. The normal method I use to patch/recompile programs is apt-get source followed by dpkg-buildpackage.

I learned from the dpkg-buildflags man page that I can set global flags in a configuration file. This seems to work for only some packages if I append the flags I want. The problem is that most programs ignore the flags and build with -O2 (and in some cases -O3) anyway.

Is there a way I can force the compiler to use -Os?

Best Answer

There is no way to set this absolutely globally, short of patching the compiler itself. There is no firm policy for configuring this thing. The dpkg-buildflags approach is an attempt to unify this to some degree, bit it is still young. It should work for most packages, but if it doesn't, you'll have to patch the source package (and perhaps inform the package maintainer to sort this out).

Related Solutions

How to configure OpenIndiana(151a8 aka “hipster”) for development

Thanks for posting this. It looks pretty complete to me.

I think you should focus on the main topic which is how to setup a development host. Things like zones and DTrace and slightly off-topic IMHO. The important thing to keep in mind wrt zones and IPS is that software packages do not necessarily make their way into a zone just because they are installed in the global zone. In fact in standard Solaris the manifest that tells which packages that by default gets inherited from global zone is a pretty short list, possibly in an attempt to keep the footprint of zone to a minimum. This means that sometimes you will explicitly have to install package into the local zone even if it is already installed in the global zone. The good news is that this does not require Internet access from the local zone as it will use the IPS repository in the global zone as an intermediate proxy repo.

Perhaps you can also clarify the aim of your development host a bit further: do you intend the host to be able to build the distro itself or "just" various Linux/Unix OSS packages ?

There's another posting on how to do the equivalent on standard Solaris 11. Since Solaris 11 and OpenIndiana share the same heritage there may be something in that posting you can use.

Linux – Find out which kernel source files were used when kernel was compiled

Compiling my comment as answer:

Run the following command on one shell. You can make a shell script of it or demonize with the -d option.

inotifywait -m -r -e open --format '%f' /kernel_sources/directory/in_use/ -o /home/user/kernel_build.log

On other shell, execute make
The log file /home/user/kernel_build.log will have a list of the files that have been opened(read operation) during the build process.

Best Answer

Related Solutions

How to configure OpenIndiana(151a8 aka “hipster”) for development

Linux – Find out which kernel source files were used when kernel was compiled

Related Question