nixpkgs/pkgs/development/interpreters/perl/default.nix
John Ericson 63bd851e95 stdenv: Introduce hasCC attribute
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.
2019-11-25 00:12:38 +00:00

220 lines
8.3 KiB
Nix

{ config, lib, stdenv, fetchurl, pkgs, buildPackages, callPackage
, enableThreading ? stdenv ? glibc, makeWrapper
}:
with lib;
# We can only compile perl with threading on platforms where we have a
# real glibc in the stdenv.
#
# Instead of silently building an unthreaded perl if this is not the
# case, we force callers to disableThreading explicitly, therefore
# documenting the platforms where the perl is not threaded.
#
# In the case of stdenv linux boot stage1 it's not possible to use
# threading because of the simpleness of the bootstrap glibc, so we
# use enableThreading = false there.
assert enableThreading -> (stdenv ? glibc);
let
libc = if stdenv.cc.libc or null != null then stdenv.cc.libc else "/usr";
libcInc = lib.getDev libc;
libcLib = lib.getLib libc;
crossCompiling = stdenv.buildPlatform != stdenv.hostPlatform;
common = { perl, buildPerl, version, sha256 }: stdenv.mkDerivation (rec {
inherit version;
name = "perl-${version}";
src = fetchurl {
url = "mirror://cpan/src/5.0/${name}.tar.gz";
inherit sha256;
};
# TODO: Add a "dev" output containing the header files.
outputs = [ "out" "man" "devdoc" ] ++
stdenv.lib.optional crossCompiling "dev";
setOutputFlags = false;
disallowedReferences = [ stdenv.cc ];
patches =
[
# Do not look in /usr etc. for dependencies.
(if (versionOlder version "5.29.6") then ./no-sys-dirs-5.26.patch
else if (versionOlder version "5.31.1") then ./no-sys-dirs-5.29.patch
else ./no-sys-dirs-5.31.patch)
]
++ optional (versionOlder version "5.29.6")
# Fix parallel building: https://rt.perl.org/Public/Bug/Display.html?id=132360
(fetchurl {
url = "https://rt.perl.org/Public/Ticket/Attachment/1502646/807252/0001-Fix-missing-build-dependency-for-pods.patch";
sha256 = "1bb4mldfp8kq1scv480wm64n2jdsqa3ar46cjp1mjpby8h5dr2r0";
})
++ optional stdenv.isSunOS ./ld-shared.patch
++ optionals stdenv.isDarwin [ ./cpp-precomp.patch ./sw_vers.patch ]
++ optional crossCompiling ./MakeMaker-cross.patch;
postPatch = ''
pwd="$(type -P pwd)"
substituteInPlace dist/PathTools/Cwd.pm \
--replace "/bin/pwd" "$pwd"
'' + stdenv.lib.optionalString crossCompiling ''
substituteInPlace cnf/configure_tool.sh --replace "cc -E -P" "cc -E"
'';
# Build a thread-safe Perl with a dynamic libperls.o. We need the
# "installstyle" option to ensure that modules are put under
# $out/lib/perl5 - this is the general default, but because $out
# contains the string "perl", Configure would select $out/lib.
# Miniperl needs -lm. perl needs -lrt.
configureFlags =
(if crossCompiling
then [ "-Dlibpth=\"\"" "-Dglibpth=\"\"" ]
else [ "-de" "-Dcc=cc" ])
++ [
"-Uinstallusrbinperl"
"-Dinstallstyle=lib/perl5"
"-Duseshrplib"
"-Dlocincpth=${libcInc}/include"
"-Dloclibpth=${libcLib}/lib"
]
++ optionals ((builtins.match ''5\.[0-9]*[13579]\..+'' version) != null) [ "-Dusedevel" "-Uversiononly" ]
++ optional stdenv.isSunOS "-Dcc=gcc"
++ optional enableThreading "-Dusethreads";
configureScript = stdenv.lib.optionalString (!crossCompiling) "${stdenv.shell} ./Configure";
dontAddPrefix = !crossCompiling;
enableParallelBuilding = !crossCompiling;
preConfigure = ''
substituteInPlace ./Configure --replace '`LC_ALL=C; LANGUAGE=C; export LC_ALL; export LANGUAGE; $date 2>&1`' 'Thu Jan 1 00:00:01 UTC 1970'
substituteInPlace ./Configure --replace '$uname -a' '$uname --kernel-name --machine --operating-system'
'' + optionalString (!crossCompiling) ''
configureFlags="$configureFlags -Dprefix=$out -Dman1dir=$out/share/man/man1 -Dman3dir=$out/share/man/man3"
'' + optionalString (stdenv.isAarch32 || stdenv.isMips) ''
configureFlagsArray=(-Dldflags="-lm -lrt")
'' + optionalString stdenv.isDarwin ''
substituteInPlace hints/darwin.sh --replace "env MACOSX_DEPLOYMENT_TARGET=10.3" ""
'' + optionalString (!enableThreading) ''
# We need to do this because the bootstrap doesn't have a static libpthread
sed -i 's,\(libswanted.*\)pthread,\1,g' Configure
'';
setupHook = ./setup-hook.sh;
passthru = rec {
interpreter = "${perl}/bin/perl";
libPrefix = "lib/perl5/site_perl";
pkgs = callPackage ../../../top-level/perl-packages.nix {
inherit perl buildPerl;
overrides = config.perlPackageOverrides or (p: {}); # TODO: (self: super: {}) like in python
};
buildEnv = callPackage ./wrapper.nix {
inherit perl;
inherit (pkgs) requiredPerlModules;
};
withPackages = f: buildEnv.override { extraLibs = f pkgs; };
};
doCheck = false; # some tests fail, expensive
# TODO: it seems like absolute paths to some coreutils is required.
postInstall =
''
# Remove dependency between "out" and "man" outputs.
rm "$out"/lib/perl5/*/*/.packlist
# Remove dependencies on glibc and gcc
sed "/ *libpth =>/c libpth => ' '," \
-i "$out"/lib/perl5/*/*/Config.pm
# TODO: removing those paths would be cleaner than overwriting with nonsense.
substituteInPlace "$out"/lib/perl5/*/*/Config_heavy.pl \
--replace "${libcInc}" /no-such-path \
--replace "${
if stdenv.hasCC then stdenv.cc.cc else "/no-such-path"
}" /no-such-path \
--replace "${stdenv.cc}" /no-such-path \
--replace "$man" /no-such-path
'' + stdenv.lib.optionalString crossCompiling
''
mkdir -p $dev/lib/perl5/cross_perl/${version}
for dir in cnf/{stub,cpan}; do
cp -r $dir/* $dev/lib/perl5/cross_perl/${version}
done
mkdir -p $dev/bin
install -m755 miniperl $dev/bin/perl
export runtimeArch="$(ls $out/lib/perl5/site_perl/${version})"
# wrapProgram should use a runtime-native SHELL by default, but
# it actually uses a buildtime-native one. If we ever fix that,
# we'll need to fix this to use a buildtime-native one.
#
# Adding the arch-specific directory is morally incorrect, as
# miniperl can't load the native modules there. However, it can
# (and sometimes needs to) load and run some of the pure perl
# code there, so we add it anyway. When needed, stubs can be put
# into $dev/lib/perl5/cross_perl/${version}.
wrapProgram $dev/bin/perl --prefix PERL5LIB : \
"$dev/lib/perl5/cross_perl/${version}:$out/lib/perl5/${version}:$out/lib/perl5/${version}/$runtimeArch"
''; # */
meta = {
homepage = https://www.perl.org/;
description = "The standard implementation of the Perl 5 programmming language";
license = licenses.artistic1;
maintainers = [ maintainers.eelco ];
platforms = platforms.all;
priority = 6; # in `buildEnv' (including the one inside `perl.withPackages') the library files will have priority over files in `perl`
};
} // stdenv.lib.optionalAttrs (stdenv.buildPlatform != stdenv.hostPlatform) rec {
crossVersion = "980998f7d11baf97284426ca91f84681d49a08f5"; # Jul 20, 2019
perl-cross-src = fetchurl {
url = "https://github.com/arsv/perl-cross/archive/${crossVersion}.tar.gz";
sha256 = "1hg3k2rhjs5gclrm05z87nvlh4j9pg7mkm9998h9gy6mzk8224q5";
};
depsBuildBuild = [ buildPackages.stdenv.cc makeWrapper ];
postUnpack = ''
unpackFile ${perl-cross-src}
cp -R perl-cross-${crossVersion}/* perl-${version}/
'';
configurePlatforms = [ "build" "host" "target" ];
# TODO merge setup hooks
setupHook = ./setup-hook-cross.sh;
});
in {
# Maint version
perl528 = common {
perl = pkgs.perl528;
buildPerl = buildPackages.perl528;
version = "5.28.2";
sha256 = "1iynpsxdym4h76kgndmn3ykvwxhqz444xvaz8z2irsxkvmnlb5da";
};
# Maint version
perl530 = common {
perl = pkgs.perl530;
buildPerl = buildPackages.perl530;
version = "5.30.0";
sha256 = "1wkmz6xn3fswpqhz29akiklcxclnlykhp96a8bqcz36rak3i64l5";
};
# the latest Devel version
perldevel = common {
perl = pkgs.perldevel;
buildPerl = buildPackages.perldevel;
version = "5.31.2";
sha256 = "00bdh9lmjb0m7dhk8mj7kab7cg2zn9zgw82y4hgkwydzg6d1jis0";
};
}