Cross-compiling to windows

[luciusmagn]

Hi,
I have the following issue with cross-compiling to windows:

error: builder for '/nix/store/9vhlnb3xj58p7n6zswqln34bmwyrld0z-install-tool-0.0.1.drv' failed with exit code 101;
       last 10 log lines:
       > warning: `minerctl` (lib) generated 32 warnings
       >    Compiling install-tool v1.1.0 (/build/source/install-tool)
       > error: linking with `/nix/store/kaj4v2c1w2wf7ixcihwq0q43k7m91753-x86_64-w64-mingw32-stage-final-gcc-wrapper-11.3.0/bin/x86_64-w64-mingw32-cc` failed: exit status: 1
       >   |
       >   = note: "/nix/store/kaj4v2c1w2wf7ixcihwq0q43k7m91753-x86_64-w64-mingw32-stage-final-gcc-wrapper-11.3.0/bin/x86_64-w64-mingw32-cc" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "/nix/store/fjphxpk768irqsmd56i242snkjx8dddc-rust-default-1.62.1/lib/rustlib/x86_64-pc-windows-gnu/lib/rsbegin.o" "/build/rustce92faY/symbols.o" "/build/source/target/x86_64-pc-windows-gnu/release/deps/install_tool-de54c186e97b2842.install_tool.312de941-cgu.8.rcgu.o" "-L" "/build/source/target/x86_64-pc-windows-gnu/release/deps" "-L" "/build/source/target/release/deps" "-L" "/nix/store/c683sfs30iifbcy09dz1hg2rvpb1zx2x-vendor-cargo-deps/c19b7c6f923b580ac259164a89f2577984ad5ab09ee9d583b888f934adbbe8d0/winapi-x86_64-pc-windows-gnu-0.4.0/lib" "-L" "/nix/store/c683sfs30iifbcy09dz1hg2rvpb1zx2x-vendor-cargo-deps/c19b7c6f923b580ac259164a89f2577984ad5ab09ee9d583b888f934adbbe8d0/windows_x86_64_gnu-0.42.0/lib" "-L" "/build/source/target/x86_64-pc-windows-gnu/release/build/ring-3886cd5b46052115/out" "-L" "/build/source/target/x86_64-pc-windows-gnu/release/build/openssl-sys-148185712493482e/out/openssl-build/install/lib" "-L" "/nix/store/fjphxpk768irqsmd56i242snkjx8dddc-rust-default-1.62.1/lib/rustlib/x86_64-pc-windows-gnu/lib" "-Wl,-Bstatic" "/build/rustce92faY/libring-dfa6f44e99f98a86.rlib" "/build/rustce92faY/libopenssl_sys-36a235fa304d1652.rlib" "-Wl,--start-group" "-Wl,--end-group" "/nix/store/mbl96hfz133qz56shq7lkzlvd7w1n8y1-rust-std-1.62.1-x86_64-pc-windows-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/libcompiler_builtins-50eb72b9dd1763b8.rlib" "-Wl,-Bdynamic" "-ladvapi32" "-lbcrypt" "-lntdll" "-lwindows" "-lwinapi_advapi32" "-lwinapi_cfgmgr32" "-lwinapi_credui" "-lwinapi_fwpuclnt" "-lwinapi_gdi32" "-lwinapi_kernel32" "-lwinapi_msimg32" "-lwinapi_ntdll" "-lwinapi_ole32" "-lwinapi_opengl32" "-lwinapi_runtimeobject" "-lwinapi_secur32" "-lwinapi_user32" "-lwinapi_winspool" "-lwinapi_ws2_32" "-lgdi32" "-luser32" "-lcrypt32" "-lws2_32" "-ladvapi32" "-ladvapi32" "-luserenv" "-lkernel32" "-lws2_32" "-lbcrypt" "-lgcc_eh" "-l:libpthread.a" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "/nix/store/fjphxpk768irqsmd56i242snkjx8dddc-rust-default-1.62.1/lib/rustlib/x86_64-pc-windows-gnu/lib" "-o" "/build/source/target/x86_64-pc-windows-gnu/release/deps/install_tool-de54c186e97b2842.exe" "-Wl,--gc-sections" "-no-pie" "-Wl,-O1" "-Wl,--strip-all" "-nodefaultlibs" "/nix/store/fjphxpk768irqsmd56i242snkjx8dddc-rust-default-1.62.1/lib/rustlib/x86_64-pc-windows-gnu/lib/rsend.o"
       >   = note: /nix/store/ar3j35s4brxdda418xd48qzh3af6pggb-x86_64-w64-mingw32-binutils-2.39/bin/x86_64-w64-mingw32-ld: cannot find -l:libpthread.a: No such file or directory
       >           collect2: error: ld returned 1 exit status
       >
       >
       > error: could not compile `install-tool` due to previous error
       For full logs, run 'nix log /nix/store/9vhlnb3xj58p7n6zswqln34bmwyrld0z-install-tool-0.0.1.drv'.

It seems I encounter the cannot find libpthread.a error no matter what I do.

This is how I have defined my pkgCross:

    flake-utils.lib.eachSystem [ "x86_64-linux" ] (localSystem:
      let
        mkNixpkgs = { arch, extras ? { } }:
          (import nixpkgs)
            {
              inherit localSystem;
              crossSystem.config = arch;
              config.allowUnsupportedSystem = true;
            } // extras;

        pkgs = (import nixpkgs) {
          inherit localSystem;
          overlays = [ (import rust-overlay) ];
        };

        inherit (pkgs) lib;

        rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
        craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchain;


        # TODO: map mkNixpkgs [ target1 target2 ... ]
        pkgsCross = {
          x86_64-linux = mkNixpkgs { arch = "x86_64-unknown-linux-musl"; };
          aarch64-linux = mkNixpkgs { arch = "aarch64-unknown-linux-musl"; };
          armv7-linux = mkNixpkgs { arch = "armv7-unknown-linux-musleabihf"; };
          x86_64-windows = mkNixpkgs
            { arch = "x86_64-w64-mingw32"; extras = { crossSystem.libc = "msvcrt"; crossSystem.useLLVM = true; }; }
          ;
        };

        # TODO: https://github.com/ipetkov/crane/blob/master/lib/default.nix
        iiLib = {
          makeCargoCrossEnvVars = stdenv: target:
            let
              target' = lib.replaceStrings [ "-" ] [ "_" ] target;
              TARGET' = lib.toUpper target';
              cross_cc = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc";
              host_cc = "${pkgs.pkgsBuildBuild.stdenv.cc}/bin/${stdenv.cc.nativePrefix}cc";
            in
            {
              "CC_${target'}" = cross_cc;
              "CARGO_TARGET_${TARGET'}_LINKER" = cross_cc;
              CARGO_BUILD_TARGET = target;
              HOST_CC = host_cc;
            };
        };


        # filtered monorepo source code
        src = lib.cleanSourceWith {
          # apply the default source cleaning from nixpkgs
          src = lib.cleanSource ./.;
          # then add our own filter on top
          filter = path: type:
            let
              # keep files in directory "assets/"  # TODO: better solution (cargo manifest include/exclude, `cargo package --list --allow-dirty`)
              customFilter = path: _type: (builtins.match ".*assets/.*" path) != null;
            in
            (customFilter path type) || (craneLib.filterCargoSources path type);
        };

This is how the crate definition looks:

        install-tool-expr = { iiLib, craneLib, src, rustCrossTarget, stdenv, pkg-config, openssl, perl, doCheck }:
          let
            pname = "install-tool";

            # TODO: vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

            lints = [
              "-A unused-extern-crates"
              "-A unused-crate-dependencies"
              #"-D warnings"
            ];

            rustflags = lints ++ [
              "-C target-feature=+crt-static"
            ];

            commonArgs = (iiLib.makeCargoCrossEnvVars stdenv rustCrossTarget) // {
              # depsBuildHost
              nativeBuildInputs = [ pkg-config perl ];
              # depsHostTarget
              buildInputs = [ ] ++ lib.optionals (!stdenv.hostPlatform.isWindows && !stdenv.hostPlatform.isMacOS) [
                openssl
              ];

              # CARGO_BUILD_RUSTFLAGS didn't work
              RUSTFLAGS = lib.concatStringsSep " " rustflags;
            };

            # build all dependencies of all packages in the virtual workspace (equivalent to passing --workspace)
            cargoArtifacts = craneLib.buildDepsOnly (commonArgs // {
              inherit src;
              pname = "workspace";
              doCheck = false;
            });

            # TODO: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this should be common for all packages in the workspace

            package = craneLib.buildPackage (commonArgs // {
              inherit src pname cargoArtifacts doCheck;
              cargoExtraArgs = "--bin ${pname}";
              #doCheck = false;
            });
          in
          package;

Any pointers as to what I can do? I am still fairly new to Nix, so sorry if that is a stupid question.

[ipetkov]

Hi @luciusmagn have you added windows.pthreads to your build inputs?

I've opened #218 to add an example of this, hope it helps!