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examples: Add i686-pc-windows-gnu to multi-target

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This commit is contained in:
Vladimir Romashchenko 2022-08-30 03:38:48 -04:00 committed by Patryk Wychowaniec
parent c6a45e4277
commit 8d2f4d00cb
1 changed files with 49 additions and 0 deletions
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49
examples/multi-target/flake.nix
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@ -19,6 +19,7 @@
minimal.cargo
targets.x86_64-unknown-linux-musl.latest.rust-std
targets.x86_64-pc-windows-gnu.latest.rust-std
targets.i686-pc-windows-gnu.latest.rust-std
];
naersk' = naersk.lib.${system}.override {
@ -85,6 +86,54 @@
];
};
# For `nix build .#i686-pc-windows-gnu`:
packages.i686-pc-windows-gnu =
let
# GCC supports 2 types of exception handling: SJLJ and DWARF-2
# (https://gcc.gnu.org/wiki/WindowsGCCImprovements)
#
# Rust uses libgcc_eh for exception handling and it does not support SJLJ
# (https://github.com/rust-lang/rust/pull/55444#issuecomment-434044002)
#
# Solution for this are either:
# 1. Rebuilding MinGW32 with DWARF-2 enabled instead of SJLJ (Which is provided in this example)
# 2. Using "panic = abort" for i686-pc-windows-gnu target and rebuilding rust-std to exclude any linking to libgcc_eh
cc' = pkgs.pkgsCross.mingw32.buildPackages.wrapCC (
pkgs.pkgsCross.mingw32.buildPackages.gcc.cc.overrideAttrs (oldAttr: rec{
configureFlags = oldAttr.configureFlags ++ [
# Taken from Fedora mingw32 rpm spec
# (https://src.fedoraproject.org/rpms/mingw-gcc/blob/rawhide/f/mingw-gcc.spec)
"--disable-sjlj-exceptions --with-dwarf2"
];
})
);
in naerskBuildPackage "i686-pc-windows-gnu" {
src = ./.;
doCheck = true;
strictDeps = true;
# libgcc_eh implicitly requires libmcfgthread to be linked.
depsBuildBuild = [cc'] ++ (with pkgs.pkgsCross.mingw32.windows; [ pthreads mcfgthreads ]);
# It's currently not possible to statically link mcfgtread, so instead just add a symlink so it's easier to transfer to target machine
postInstall = ''
ln -s ${pkgs.pkgsCross.mingw32.windows.mcfgthreads}/bin/mcfgthread-12.dll $out/bin/mcfgthread-12.dll
'';
CARGO_TARGET_I686_PC_WINDOWS_GNU_RUSTFLAGS = "-Clink-args=-lmcfgthread";
CARGO_TARGET_I686_PC_WINDOWS_GNU_RUNNER = pkgs.writeScript "wine-wrapper" ''
export WINEPREFIX="$(mktemp -d)"
ln -s \
${pkgs.pkgsCross.mingw32.windows.mcfgthreads}/bin/mcfgthread-12.dll \
mcfgthread-12.dll
exec wine64 $@
'';
nativeBuildInputs = with pkgs; [
# We need Wine to run tests:
wineWowPackages.stable
];
};
devShell = pkgs.mkShell (
{
inputsFrom = with packages; [ x86_64-unknown-linux-musl x86_64-pc-windows-gnu ];