Host dependencies and checking them
bobafetthotmail at gmail.com
Sun Feb 21 11:07:12 EST 2021
On 20/02/21 23:52, Bas Mevissen wrote:
> Hi all,
> When starting a clean build (21.02 branch) on a clean Fedora 33 machine,
> I ran into the small issue of tools/autoconf failing to build. This was
> due to perl-File-Compare missing. I apparently missed that prerequisite.
> After installing said package, everything built fine.
> Looking at the instructions at
> listing all prerequisites, I at first did not find perl-File-Compare. It
> was only at the distribution specific instructions for CentOS/Fedora
> that it was mentioned.
> The main list does specifically mention perl-ExtUtils-MakeMaker and
> perl-Thread-Queue, so I wonder whether perl-File-Compare should be added
> there as well?
It's better to add it, yes. Depending on distro you may or may not need
to install a specific package for it, but if you can't build the core
repo and its packages without it, then it should be added to the list.
> Another question regarding prerequisites: is python2 still a requirement
> for master and openwrt-21.02?
afaik no, the migration to python 3 was completed years ago, only
references for python2 are to make sure that the build system is NOT
using it even if it's installed or left in the build folders from
> Anyway, it made me wonder whether the prerequisites list and test for at
> least the core should be revised. I took a look at the current list and
> compared them to include/prereq-build.mk from current (2021-02-20)
> openwrt-21.02 branch:
> PREREQ prereq-build.mk needed result
> asciidoc no no? Q
> bash yes yes OK
> binutils no yes ADD
> bzip2 yes yes OK
> flex no hostbuild -> no REMOVE
> git yes yes OK
> g++ yes (no IB) yes OK
> gcc yes (no IB) yes OK
> time no no? Q
> getopt yes yes OK
> gawk yes yes OK
> help2man no no? Q
> intltool-update no no? Q
> libelf-dev no yes ADD
> libz-dev no yes ADD
> make yes yes OK
> ncurses yes yes OK
> openssl no util&lib? Q
> patch yes yes OK
> perl ExtUtils-
> MakeMaker no ? Q
> perl Thread-
> Queue yes ? Q
> python2-dev no no >19.07? Q
> unzip yes yes OK
> wget yes yes OK
> xgettext no yes ADD
> xsltproc no no REMOVE
> zlib no yes ADD
> The file prereq-build.mk does check for a number of other utilities that
> are not in the list or only in the distribution specific requirements:
> Perl Data::Dumper
> perl (5.x)
> python (>=3.5)
these should be probably added to the list, as the build won't start if
these are missing.
It wouldn't be a bad thing to update the prereq-build.mk file as well
with the other missing things but I'm not a core developer and I'd
rather not touch these things.
> Looking at the distro specific instructions, I noticed a variation in
> the advised mandatoty and optional packages to install per distro.
> For example, some install asciidoc, other ccache and so on.
the variation is probably due to the fact that other packages that
aren't part of core repo might need that and the user had enabled them,
or that some options not enabled by default (like ccache) might need them.
Also there might be just legacy information from older versions (or just
wrong info) that nobody ever updated and got carried over by cargo
culting. The distro-specific information is added and updated by users
> I would like to help cleaning this up, both the code and the
> documentation. What I need is input on what are mandatory and what are
> optional prerequisites
Mandatory prerequisites are things that are necessary for building core
repository without package feeds, and most of that stuff should be
listed in the prereq-build.mk.
Optional is what is needed to build core repo with non-default options
and to build other packages in the feeds.
This is not strictly defined, in most cases it's the package's own
source and build system that does the prerequisite check before building
and throws errors if it does not find things so you can't just check in
It might not be practical to map all prerequisites of all packages
available, so you might just document how to deal with build failures
for optional packages/options (i.e. how to read the build log and see
why it failed so you can install missing dependencies)
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