build ldc2-druntime using Zig build

build.zig

//! Based on: https://github.com/denizzzka/ldc-external_druntime_backend/blob/external_druntime_backend_support/runtime/druntime/meson.build

const std = @import("std");
const abs = @import("abs");
const builtin = @import("builtin");

pub fn build(b: *std.Build) !void {
    // ldc2/ldmd2 not have mingw-support
    const target = b.standardTargetOptions(.{
        .default_target = if (builtin.os.tag == .windows)
            try std.Target.Query.parse(.{
                .arch_os_abi = "native-windows-msvc",
            })
        else
            .{},
    });
    const optimize = b.standardOptimizeOption(.{});

    const source = switch (target.result.cpu.arch) {
        .aarch64, .arm, .aarch64_32, .aarch64_be, .armeb => &[_][]const u8{"src/ldc/arm_unwind.c"} ++ src,
        else => src,
    };

    const threadAsm = b.addAssembly(.{
        .name = "threadasm",
        .target = target,
        .optimize = optimize,
        .source_file = b.path("src/core/threadasm.S"),
    });

    try buildD(b, .{
        .name = "druntime",
        .kind = .lib,
        .target = target,
        .optimize = optimize,
        .sources = source,
        .dflags = &.{
            "-Isrc",
            "-w",
            "-conf=",
            "-defaultlib=",

            // Versions
            "--d-version=AsmExternal", // used by fiber module
            "--d-version=OnlyLowMemUnittest", //disables memory-greedy unittests
        },
        .artifact = threadAsm,
        .use_zigcc = true,
    });
}

fn buildD(b: *std.Build, options: abs.DCompileStep) !void {
    const exe = try abs.ldcBuildStep(b, options);
    b.default_step.dependOn(&exe.step);
}

const src = &[_][]const u8{
    "src/core/bitop.d",
    "src/core/cpuid.d",
    "src/core/gc/config.d",
    "src/core/gc/gcinterface.d",
    "src/core/gc/registry.d",
    "src/core/demangle.d",
    "src/core/exception.d",
    "src/core/internal/abort.d",
    "src/core/internal/array/appending.d",
    "src/core/internal/array/capacity.d",
    "src/core/internal/array/concatenation.d",
    "src/core/internal/array/equality.d",
    "src/core/internal/array/utils.d",
    "src/core/internal/backtrace/unwind.d",
    "src/core/internal/container/common.d",
    "src/core/internal/convert.d",
    "src/core/internal/container/treap.d",
    "src/core/internal/entrypoint.d",
    "src/core/internal/gc/bits.d",
    "src/core/internal/gc/impl/conservative/gc.d",
    "src/core/internal/gc/impl/manual/gc.d",
    "src/core/internal/gc/impl/proto/gc.d",
    "src/core/internal/gc/os.d",
    "src/core/internal/gc/proxy.d",
    "src/core/internal/lifetime.d",
    "src/core/internal/parseoptions.d",
    "src/core/internal/qsort.d",
    "src/core/internal/spinlock.d",
    "src/core/internal/string.d",
    "src/core/internal/traits.d",
    "src/core/internal/util/array.d",
    "src/core/lifetime.d",
    "src/core/runtime.d",
    "src/core/memory.d",
    "src/core/sync/condition.d",
    "src/core/sync/event.d",
    "src/core/sync/exception.d",
    "src/core/sync/semaphore.d",
    "src/core/time.d",
    "src/core/thread/fiber.d",
    "src/core/thread/osthread.d",
    "src/core/thread/threadbase.d",
    "src/core/thread/threadgroup.d",
    "src/core/thread/types.d",
    "src/core/thread/context.d",
    "src/core/thread/package.d",
    "src/core/stdc/fenv.d",
    "src/core/stdc/errno.d",
    "src/core/stdc/stdint.d",
    "src/core/stdc/stdio.d",
    "src/core/stdc/wchar_.d",
    "src/object.d",
    "src/rt/adi.d",
    "src/rt/aaA.d",
    "src/rt/arraycat.d",
    "src/rt/cast_.d",
    "src/rt/config.d",
    "src/rt/critical_.d",
    "src/rt/deh.d",
    "src/rt/deh_win64_posix.d",
    "src/rt/dmain2.d",
    "src/rt/dwarfeh.d",
    "src/rt/ehalloc.d",
    "src/rt/invariant.d",
    "src/rt/lifetime.d",
    "src/rt/memory.d",
    "src/rt/minfo.d",
    "src/rt/monitor_.d",
    "src/rt/profilegc.d",
    "src/rt/tlsgc.d",
    "src/rt/util/typeinfo.d",
    "src/rt/util/utility.d",
    "src/rt/sections.d",
    "src/rt/sections_android.d",
    "src/rt/sections_elf_shared.d",
    "src/rt/sections_ldc.d",
    "src/rt/sections_osx_x86.d",
    // "src/ldc/sanitizers_optionally_linked.d",
};

build.zig.zon

.{
    .name = "druntime",
    .version = "0.0.1",
    .dependencies = .{
        .abs = .{
            .url = "git+https://github.com/kassane/anotherBuildStep#4cb71185673f600091b92aa082db33f7f6b0d38c",
            .hash = "1220c7e6dc78a53c0504f93a4c9e885b8293873b799b7c755793f7d46a5309d5b6ed",
        },
    },
    .paths = .{""},
}

output.log

/home/kassane/ldc-bootstrap/out/zig-x86_64-linux-musl-baseline/zig build-obj /home/kassane/ldc-bootstrap/ldc/runtime/druntime/src/core/threadasm.S -OReleaseSafe -Mroot --cache-dir /home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache --global-cache-dir /home/kassane/.cache/zig --name threadasm --listen=- 
/home/kassane/ldc-bootstrap/out/host/bin/ldmd2 -lib -fvisibility=hidden -Isrc -w -conf= -defaultlib= --d-version=AsmExternal --d-version=OnlyLowMemUnittest -O3 -release -enable-inlining -boundscheck=safeonly -vcolumns -od=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache/o/14aa04743dbb632965b320ade3466ef4 -cache=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache/o/14aa04743dbb632965b320ade3466ef4 -oq -cleanup-obj -disable-verify -Hkeep-all-bodies -i -I/home/kassane/.cache/zig/p/1220c7e6dc78a53c0504f93a4c9e885b8293873b799b7c755793f7d46a5309d5b6ed/src src/core/bitop.d src/core/cpuid.d src/core/gc/config.d src/core/gc/gcinterface.d src/core/gc/registry.d src/core/demangle.d src/core/exception.d src/core/internal/abort.d src/core/internal/array/appending.d src/core/internal/array/capacity.d src/core/internal/array/concatenation.d src/core/internal/array/equality.d src/core/internal/array/utils.d src/core/internal/backtrace/unwind.d src/core/internal/container/common.d src/core/internal/convert.d src/core/internal/container/treap.d src/core/internal/entrypoint.d src/core/internal/gc/bits.d src/core/internal/gc/impl/conservative/gc.d src/core/internal/gc/impl/manual/gc.d src/core/internal/gc/impl/proto/gc.d src/core/internal/gc/os.d src/core/internal/gc/proxy.d src/core/internal/lifetime.d src/core/internal/parseoptions.d src/core/internal/qsort.d src/core/internal/spinlock.d src/core/internal/string.d src/core/internal/traits.d src/core/internal/util/array.d src/core/lifetime.d src/core/runtime.d src/core/memory.d src/core/sync/condition.d src/core/sync/event.d src/core/sync/exception.d src/core/sync/semaphore.d src/core/time.d src/core/thread/fiber.d src/core/thread/osthread.d src/core/thread/threadbase.d src/core/thread/threadgroup.d src/core/thread/types.d src/core/thread/context.d src/core/thread/package.d src/core/stdc/fenv.d src/core/stdc/errno.d src/core/stdc/stdint.d src/core/stdc/stdio.d src/core/stdc/wchar_.d src/object.d src/rt/adi.d src/rt/aaA.d src/rt/arraycat.d src/rt/cast_.d src/rt/config.d src/rt/critical_.d src/rt/deh.d src/rt/deh_win64_posix.d src/rt/dmain2.d src/rt/dwarfeh.d src/rt/ehalloc.d src/rt/invariant.d src/rt/lifetime.d src/rt/memory.d src/rt/minfo.d src/rt/monitor_.d src/rt/profilegc.d src/rt/tlsgc.d src/rt/util/typeinfo.d src/rt/util/utility.d src/rt/sections.d src/rt/sections_android.d src/rt/sections_elf_shared.d src/rt/sections_ldc.d src/rt/sections_osx_x86.d -vdmd -Xcc=-v -mtriple=x86_64-linux-gnu -mcpu=znver3 -of=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/zig-out/lib/druntime --gcc=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/zig-out/tools/zcc --linker=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/zig-out/tools/zcc /home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache/o/ee8c4a36b4ea11ed42c228aa23ac10b6/threadasm.o 
 -- Invoking: /home/kassane/ldc-bootstrap/out/host/bin/ldc2 -ldmd -lib -oq -cleanup-obj -fvisibility=hidden -Isrc -w -conf= -defaultlib= --d-version=AsmExternal --d-version=OnlyLowMemUnittest -O3 -release -enable-inlining -boundscheck=safeonly -vcolumns -od=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache/o/14aa04743dbb632965b320ade3466ef4 -cache=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache/o/14aa04743dbb632965b320ade3466ef4 -oq -cleanup-obj -disable-verify -Hkeep-all-bodies -i -I/home/kassane/.cache/zig/p/1220c7e6dc78a53c0504f93a4c9e885b8293873b799b7c755793f7d46a5309d5b6ed/src src/core/bitop.d src/core/cpuid.d src/core/gc/config.d src/core/gc/gcinterface.d src/core/gc/registry.d src/core/demangle.d src/core/exception.d src/core/internal/abort.d src/core/internal/array/appending.d src/core/internal/array/capacity.d src/core/internal/array/concatenation.d src/core/internal/array/equality.d src/core/internal/array/utils.d src/core/internal/backtrace/unwind.d src/core/internal/container/common.d src/core/internal/convert.d src/core/internal/container/treap.d src/core/internal/entrypoint.d src/core/internal/gc/bits.d src/core/internal/gc/impl/conservative/gc.d src/core/internal/gc/impl/manual/gc.d src/core/internal/gc/impl/proto/gc.d src/core/internal/gc/os.d src/core/internal/gc/proxy.d src/core/internal/lifetime.d src/core/internal/parseoptions.d src/core/internal/qsort.d src/core/internal/spinlock.d src/core/internal/string.d src/core/internal/traits.d src/core/internal/util/array.d src/core/lifetime.d src/core/runtime.d src/core/memory.d src/core/sync/condition.d src/core/sync/event.d src/core/sync/exception.d src/core/sync/semaphore.d src/core/time.d src/core/thread/fiber.d src/core/thread/osthread.d src/core/thread/threadbase.d src/core/thread/threadgroup.d src/core/thread/types.d src/core/thread/context.d src/core/thread/package.d src/core/stdc/fenv.d src/core/stdc/errno.d src/core/stdc/stdint.d src/core/stdc/stdio.d src/core/stdc/wchar_.d src/object.d src/rt/adi.d src/rt/aaA.d src/rt/arraycat.d src/rt/cast_.d src/rt/config.d src/rt/critical_.d src/rt/deh.d src/rt/deh_win64_posix.d src/rt/dmain2.d src/rt/dwarfeh.d src/rt/ehalloc.d src/rt/invariant.d src/rt/lifetime.d src/rt/memory.d src/rt/minfo.d src/rt/monitor_.d src/rt/profilegc.d src/rt/tlsgc.d src/rt/util/typeinfo.d src/rt/util/utility.d src/rt/sections.d src/rt/sections_android.d src/rt/sections_elf_shared.d src/rt/sections_ldc.d src/rt/sections_osx_x86.d -Xcc=-v -mtriple=x86_64-linux-gnu -mcpu=znver3 -of=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/zig-out/lib/druntime --gcc=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/zig-out/tools/zcc --linker=/home/kassane/ldc-bootstrap/ldc/runtime/druntime/zig-out/tools/zcc /home/kassane/ldc-bootstrap/ldc/runtime/druntime/.zig-cache/o/ee8c4a36b4ea11ed42c228aa23ac10b6/threadasm.o
Build Summary: 3/3 steps succeeded
install success
└─ druntime success 5s MaxRSS:287M
   └─ zig build-obj threadasm ReleaseSafe native success 23ms MaxRSS:42M

Updated

https://github.com/kassane/druntime-zigbuild