On 6/28/16 9:52 AM, Julian Elischer wrote:
At work I am doing various cross compiles in order to make a product
under freebsd that actually will run under a modified FreeBSD that
runs on an appliance. We want to get away from hand rolling everything
to leverage all teh work in getting ports working well on FreeBSD.
We have some extra syscalls and some structures have different sizes,
so we need to compile/link agains an alternate set of
includes/libraries and not those in /usr/include or /usr/lib.
Ideally I want to use the "--sysroot" and "-isystem" options to the
compiler/linker or failing that, add a -I or -L entries to make it
look at the correct includes and libraries, not those in the base system.
In many ports CFLAGS etc. are sent in via the arguments to ./configure
or environment vars, but there are many other ports that have other
ways to specify these.
Does the ports framework have any standard way to do this?
LDEXTRA_ARGS or EXTRA_CFLAGS or similar?
I've looked around and can't really see anything. Best would be a
single file to which I could add these things but adding them to the
environment would also work.
yours in ports ignorance..
Sounds like a decent idea to override includedirs, but I wouldn't trust
it. :)
Why not do what NANOBSD/FreeNAS do and compile inside a chroot (or even
VM) with the proper includes and such installed?
It sounds like a big sledgehammer to use a chroot or a VM, but in
reality it's MUCH safer than some port accidentally pulling something
from the wrong /usr/include and then you spending hours, days, etc
tracking it down. Trust me, I've seen the fallout and it's NOT FUN!!!
For FreeNAS we made it so that you could run the FreeNAS OS (trueos) as
the actual build server and that saved us a huge number of headaches.
If you're very, very against the idea of VM or chroot then you could
just make /usr/include actually contain YOUR includes as you probably
shouldn't need them otherwise on a build server.
-Alfred
-Alfred
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