Perl on darwin (and any other sane platform) has a pretty good threading
support, enable it.
As it turns out, we were building non-multithreaded perl on all systems,
since glibc was not part of the stdenv anymore:
nix-repl> pkgs = import <nixpkgs> {}
nix-repl> pkgs.stdenv ? glibc
false
meaning that the comments were incorrect. Thus, clear up the confusion
and remove the misleading comments, while enabling multithreading by
default. The builds will fail on unsupported platforms, and in this case
the only place is the bootstrap, where we already force
non-multithreaded perl.
As a consequence of the above, this change will cause the full rebuild
of stdenv on all platforms, including linux.
In "perl: fuse configureFlags" [1] the effects of the preConfigure
phase were merged into configureFlags. After this change values with
spaces do not reach the configure script intact.
The only flag this affects is `ldflags` for Aarch32 and Mips, and perl
builds without it on armv7l-linux so it's probably no longer required
on any platform.
Fixes:
configuring
configure flags: -de -Dcc=cc <...> -Dldflags=\"-lm -lrt\"
./Configure: eval: line 1677: unexpected EOF while looking for matching `"'
./Configure: eval: line 1678: syntax error: unexpected end of file
Configure: unknown option -lrt"
[1] 3b50d0462a
Before, we'd always use `cc = null`, and check for that. The problem is
this breaks for cross compilation to platforms that don't support a C
compiler.
It's a very subtle issue. One might think there is no problem because we
have `stdenvNoCC`, and presumably one would only build derivations that
use that. The problem is that one still wants to use tools at build-time
that are themselves built with a C compiler, and those are gotten via
"splicing". The runtime version of those deps will explode, but the
build time / `buildPackages` versions of those deps will be fine, and
splicing attempts to work this by using `builtins.tryEval` to filter out
any broken "higher priority" packages (runtime is the default and
highest priority) so that both `foo` and `foo.nativeDrv` works.
However, `tryEval` only catches certain evaluation failures (e.g.
exceptions), and not arbitrary failures (such as `cc.attr` when `cc` is
null). This means `tryEval` fails to let us use our build time deps, and
everything comes apart.
The right solution is, as usually, to get rid of splicing. Or, baring
that, to make it so `foo` never works and one has to explicitly do
`foo.*`. But that is a much larger change, and certaily one unsuitable
to be backported to stable.
Given that, we instead make an exception-throwing `cc` attribute, and
create a `hasCC` attribute for those derivations which wish to
condtionally use a C compiler: instead of doing `stdenv.cc or null ==
null` or something similar, one does `stdenv.hasCC`. This allows quering
without "tripping" the exception, while also allowing `tryEval` to work.
No platform without a C compiler is yet wired up by default. That will
be done in a following commit.
There was a mix of overrideable-in-overlays ```buildPackages.perl528``` & ```buildPackages.perldevel``` and local ```perl528``` & ```perldevel``` which were unaffected by overlays
give priority to perl libraries when they meet the perl derivation in `buildEnv`.
The notable case is `buildEnv` inside `perl.withPackages`.
The `perl' derivation includes obsolete versions of some CPAN packages
which leads to collissions when there are newer versions
of the same libraries are on the right hand side
of `perl.withPackages` (perhaps indirectly).
Fixes#60025
The only outside-curl uses of `fetchurlBoot` left are `stdenv`
and `apple-source-releases`. The latter one can probably be removed
too, but I can't test it.
Pros:
- Aggregates all behind-the-scenes insanity in a single place.
Cons:
- At the cost of 10 more derivations (but 0 new outpaths).
Perl likes to capture impure data, needlessly.
- Configure time (cf_time): make 1 second past epoch
- Target system (uname): use less uname information
