Also, Ant no longer has a build-time dependency on a particular JDK.
It finds the JDK via $JAVA_HOME or $PATH (by looking up javac). This
way, we don't need to have separate packages like apacheAntOpenJDK and
apacheAntOracleJDK. It also seems reasonable: after all, installing
GNU Make doesn't give you a C compiler either. It does mean that
instead of
buildInputs = [ ant ];
you now need to write something like
buildInputs = [ ant jdk ];
This unifies the "openjdk" and "openjre" packages. The JDK is placed
in the "out" output, the JRE in "jre".
Also, everything is now stored in $prefix/lib/openjdk, so the JDK/JRE
no longer pollute user environments with files like
"ASSEMBLY_EXCEPTION" at top-level.
This makes the disk usage footprint of building the kernel smaller in 3
ways:
1) There is no separate kernel source derivation
2) Rather than using the entire build tree, only the output of make
modules_prepare is kept in the $dev output (plus the module symbol
versioning file generated during the build)
3) Only the subset of the source tree known to be needed for external
builds is kept in $dev
Note that while 2) is supported by official kernel documentation, I
couldn't find any source describing what we need to keep for 3). I've
started with the bare minimum (the main Makefile is called by the
Makefile generated by make modules_prepare) and we can/should add more
as needed for kernelPackages.
Signed-off-by: Shea Levy <shea@shealevy.com>
This has three major benefits:
1. We no longer have two kernel build processes to maintain
2. The build process is (IMO) cleaner and cleaves more closely to
upstream. In partuclar, we use make install to install the kernel and
development source/build trees, eliminating the guesswork about which
files to copy.
3. The derivation has multiple outputs: the kernel and modules are in
the default `out' output, while the build and source trees are in a
`dev' output. This makes it possible for the full source and build tree
to be kept (which is expected by out-of-tree modules) without bloating
the closure of the system derivation.
In addition, if a solution for how to handle queries in the presence of
imports from derivations ever makes it into nix, a framework for
querying the full configuration of the kernel in nix expressions is
already in place.
Signed-off-by: Shea Levy <shea@shealevy.com>
