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lib.systems: add powerpc64-linux

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PPC64 supports two ABIs: ELF v1 and v2.

ELFv1 is historically what GCC and most packages expect, but this is
changing because musl outright does not work with ELFv1. So any distro
which uses musl must use ELFv2. Many other platforms are moving to ELFv2
too, such as FreeBSD (as of v13) and Gentoo (as of late 2020).

Since we use musl extensively, let's default to ELFv2.

Nix gives us the power to specify this declaratively for the entire
system, so ELFv1 is not dropped entirely. It can be specified explicitly
in the target config, e.g. "powerpc64-unknown-linux-elfv1". Otherwise the
default is "powerpc64-unknown-linux-elfv2". For musl,
"powerpc64-unknown-linux-musl" must use elfv2 internally to function.
This commit is contained in:
Ryan Burns 2021-01-29 19:23:04 -08:00
parent 054f792d31
commit 72b3badb61
4 changed files with 26 additions and 3 deletions
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9
lib/systems/parse.nix
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@ -337,10 +337,18 @@ rec {
The "gnu" ABI is ambiguous on 32-bit ARM. Use "gnueabi" or "gnueabihf" instead.
'';
}
{ assertion = platform: platform.system != "powerpc64-linux";
message = ''
The "gnu" ABI is ambiguous on big-endian 64-bit PPC. Use "elfv1" or "elfv2" instead.
'';
}
];
};
gnuabi64 = { abi = "64"; };
elfv1 = { abi = "elfv1"; };
elfv2 = { abi = "elfv2"; };
musleabi = { float = "soft"; };
musleabihf = { float = "hard"; };
musl = {};
@ -444,6 +452,7 @@ rec {
if lib.versionAtLeast (parsed.cpu.version or "0") "6"
then abis.gnueabihf
else abis.gnueabi
else if cpu == "powerpc64" then abis.elfv2
else abis.gnu
else abis.unknown;
};