Linking issue targeting IOS

[naydef]

Hello.
I'm trying to build a hello world program targeting IOS. I'm compiling with -betterC so that I don't bother with phobos.
I've mostly followed the cross compiling with LDC page. I'm using this toochain.

Example program:

import core.stdc.stdio;

extern(C) void main()
{
    printf("Hello world from D\n");
}

I'm building the source with CC=aarch64-apple-darwin-clang ldc2 test.d -mtriple=arm64-apple-ios16.4 -v -betterC, however the compiler complaints with following messages:

ld64.lld: error: /usr/lib64/libdispatch.so: dylib missing LC_ID_DYLIB load command
ld64.lld: error: /usr/lib64/libunwind.so: dylib missing LC_ID_DYLIB load command
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error: /home/ndf/cctools/target/bin/aarch64-apple-darwin-clang failed with status: 1

Running the previous command with -v shows:

ndf@shame ~/Projects/Dlang/misc/ipad $ CC=aarch64-apple-darwin-clang ldc2 test.d -mtriple=arm64-apple-ios16.4 -v -betterC
binary    /usr/bin/ldc2
version   1.39.0 (DMD v2.109.1, LLVM 18.1.8)
config    /usr/share/defaults/etc/ldc2.conf (arm64-apple-ios16.4)
predefs   LDC all D_Version2 assert D_PreConditions D_PostConditions D_Invariants D_BetterC AArch64 ARM_HardFloat D_HardFloat LittleEndian D_LP64 D_PIC iOS Posix CppRuntime_Clang LDC_LLVM_1801 D_ObjectiveC
parse     test
importall test
import    object	(/usr/include/dlang/ldc/object.d)
import    core.attribute	(/usr/include/dlang/ldc/core/attribute.d)
import    ldc.attributes	(/usr/include/dlang/ldc/ldc/attributes.d)
import    core.internal.hash	(/usr/include/dlang/ldc/core/internal/hash.d)
import    core.internal.traits	(/usr/include/dlang/ldc/core/internal/traits.d)
import    core.internal.entrypoint	(/usr/include/dlang/ldc/core/internal/entrypoint.d)
import    core.internal.array.appending	(/usr/include/dlang/ldc/core/internal/array/appending.d)
import    core.internal.array.comparison	(/usr/include/dlang/ldc/core/internal/array/comparison.d)
import    core.internal.array.equality	(/usr/include/dlang/ldc/core/internal/array/equality.d)
import    core.internal.array.casting	(/usr/include/dlang/ldc/core/internal/array/casting.d)
import    core.internal.array.concatenation	(/usr/include/dlang/ldc/core/internal/array/concatenation.d)
import    core.internal.array.construction	(/usr/include/dlang/ldc/core/internal/array/construction.d)
import    core.internal.array.arrayassign	(/usr/include/dlang/ldc/core/internal/array/arrayassign.d)
import    core.internal.array.capacity	(/usr/include/dlang/ldc/core/internal/array/capacity.d)
import    core.internal.dassert	(/usr/include/dlang/ldc/core/internal/dassert.d)
import    core.internal.destruction	(/usr/include/dlang/ldc/core/internal/destruction.d)
import    core.internal.moving	(/usr/include/dlang/ldc/core/internal/moving.d)
import    core.internal.postblit	(/usr/include/dlang/ldc/core/internal/postblit.d)
import    core.internal.switch_	(/usr/include/dlang/ldc/core/internal/switch_.d)
import    core.lifetime	(/usr/include/dlang/ldc/core/lifetime.d)
import    core.internal.attributes	(/usr/include/dlang/ldc/core/internal/attributes.d)
import    core.builtins	(/usr/include/dlang/ldc/core/builtins.d)
import    ldc.intrinsics	(/usr/include/dlang/ldc/ldc/intrinsics.di)
import    core.stdc.stdio	(/usr/include/dlang/ldc/core/stdc/stdio.d)
import    core.stdc.stdint	(/usr/include/dlang/ldc/core/stdc/stdint.d)
import    core.stdc.config	(/usr/include/dlang/ldc/core/stdc/config.d)
import    core.stdc.stddef	(/usr/include/dlang/ldc/core/stdc/stddef.d)
import    core.stdc.signal	(/usr/include/dlang/ldc/core/stdc/signal.d)
import    core.stdc.wchar_	(/usr/include/dlang/ldc/core/stdc/wchar_.d)
import    core.atomic	(/usr/include/dlang/ldc/core/atomic.d)
import    core.internal.atomic	(/usr/include/dlang/ldc/core/internal/atomic.d)
import    core.stdc.stdarg	(/usr/include/dlang/ldc/core/stdc/stdarg.d)
import    core.stdc.time	(/usr/include/dlang/ldc/core/stdc/time.d)
import    core.sys.posix.stdc.time	(/usr/include/dlang/ldc/core/sys/posix/stdc/time.d)
import    core.sys.posix.sys.types	(/usr/include/dlang/ldc/core/sys/posix/sys/types.d)
import    core.sys.posix.config	(/usr/include/dlang/ldc/core/sys/posix/config.d)
semantic  test
semantic2 test
semantic3 test
GC stats  2M used, 10M free, 12M total
code      test
/home/ndf/cctools/target/bin/aarch64-apple-darwin-clang test.o -o test -L/usr/lib64 -Wl,-dead_strip -target arm64-apple-ios16.4 
ld64.lld: error: /usr/lib64/libdispatch.so: dylib missing LC_ID_DYLIB load command
ld64.lld: error: /usr/lib64/libunwind.so: dylib missing LC_ID_DYLIB load command
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error: /home/ndf/cctools/target/bin/aarch64-apple-darwin-clang failed with status: 1

If I remove -L/usr/lib64 from clang command the code compiles successfully (as well as runs fine). Question is how to tell LDC not to add this parameter?

Or maybe I'm doing this all wrong? Why it's complaining about these two libs only?

[kinke]

We don't hardcode a /usr/lib64 dir or something like that. How does your /usr/share/defaults/etc/ldc2.conf look like?

[naydef]

The content:

// See comments in driver/config.d in ldc source tree for grammar description of
// this config file.

// For cross-compilation, you can add sections for specific target triples by
// naming the sections as (quoted) regex patterns. See LDC's `-v` output
// (`config` line) to figure out your normalized triple, depending on the used
// `-mtriple`, `-m32` etc. E.g.:
//
//     "^arm.*-linux-gnueabihf$": { … };
//     "86(_64)?-.*-linux": { … };
//     "i[3-6]86-.*-windows-msvc": { … };
//
// Later sections take precedence and override settings from previous matching
// sections while inheriting unspecified settings from previous sections.
// A `default` section always matches (treated as ".*") and is therefore usually
// the first section.
default:
{
    // default switches injected before all explicit command-line switches
    switches = [
        "-defaultlib=phobos2-ldc,druntime-ldc",
    ];
    // default switches appended after all explicit command-line switches
    post-switches = [
        "-I/usr/include/dlang/ldc",
    ];
    // default directories to be searched for libraries when linking
    lib-dirs = [
        "/usr/lib64",
    ];
    // default rpath when linking against the shared default libs
    rpath = "/usr/lib64";
};

"^wasm(32|64)-":
{
    switches = [
        "-defaultlib=",
        "-L-z", "-Lstack-size=1048576",
        "-L--stack-first",
        "-L--export-dynamic",
    ];
    lib-dirs = [];
};

I actually see now. I was thinking I was using ldc downloaded using the install.sh script but instead it was using ldc installed using the package manager. The ldc2.conf config shown above is from ldc which was downloaded from os' own package manager.

I now properly switched to ldc2 from the install.sh script and now the code compiles successfully.

Thanks a lot!