To keep this a bit more specific, we're trying to build coccinelle for
EPEL 9. This requires ocaml [compiler] and a bunch of ocaml packages.
They are mainly in RHEL buildroot.
The problem we're going to have (which to be fair is a problem
somewhat specific to OCaml linking) is that an alternate OCaml
compiler built for EPEL will have different hash values[1] for core
libraries.
If we use a different version from the RHEL compiler, say we use
Fedora Rawhide version, then all the hashes will be different.
If we use the same version as in RHEL, then most hash values will be
the same, but if the compiler flags are even slightly different then
there will be some differences.
OCaml libraries in RHEL that we do ship (ocaml-libnbd and others) will
not be linkable with code compiled with the EPEL toolchain.
It's entirely possible we don't care about this, and I maybe even
agree. But also that people using RHEL with EPEL added will get into
weird situations if they try to recompile the virt tools packages.
Rich.
[1] Hash values are computed over the modules to prevent linking
incompatible versions:
$ ocamlobjinfo /usr/lib64/ocaml/unix.cma | grep Unix
Unit name: Unix
49c6c492a189deeaed5bf77a6793e7fa Unix
and turned into RPM dependencies:
$ rpm -qR ocaml | grep Unix
ocaml(Unix) = 49c6c492a189deeaed5bf77a6793e7fa
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html
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