Problem with -Wl,-gc-sections if I use -fuse-ld=lld under NativeAot

[DeafMan1983]

Hello everyone,

I want to know how do I use -Wl,-no-gc-sections during -fuse-ld=lld

Example I want to build statically linked dotnet app for pure xcb application.

It happens if I create simple like 01_GettingStarted with my own library ( xcb-module ,but I will release soon... xcb-module is successor for xcb core and extensions like in glib-2.0, gmodule 2.0

if it happens I already prompt with
dotnet publish -c Release -r linux-x64 -p:PublishAot=true

Then it shows error cause -Wl,-gc-sections have _start and _stop inside my dotnet application.
Error from dotnet publish -c Release -r linux-x64 -p:PublishAot=true

dotnet publish -c Release -r linux-x64 -p:PublishAot=true
Restore complete (1.8s)
    info NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy
  DeafMan1983.Interop.XCB succeeded (0.2s) → /home/deafman1983/Documents/CSharpProjects/Gtk4Sharp/DeafMan1983.Interop.XCB/bin/Release/net10.0/DeafMan1983.Interop.XCB.dll
  01_GettingStarted failed with 2 error(s) (6.5s) → bin/Release/net10.0/linux-x64/01_GettingStarted.dll
    clang : error linker command failed with exit code 1 (use -v to see invocation)
    /home/deafman1983/.nuget/packages/microsoft.dotnet.ilcompiler/10.0.0-rc.1.25451.107/build/Microsoft.NETCore.Native.targets(389,5): error MSB3073: The command ""clang" "obj/Release/net10.0/linux-x64/native/01_GettingStarted.o" -o "bin/Release/net10.0/linux-x64/native/01_GettingStarted" -Wl,--version-script="obj/Release/net10.0/linux-x64/native/01_GettingStarted.exports" -Wl,--export-dynamic -L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb -lXau -lXdmcp -L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb-util -lxcb -lXau -lXdmcp -L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb-module -gz=zlib -fuse-ld=bfd /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.Native.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.IO.Compression.Native.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.Net.Security.Native.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.Security.Cryptography.Native.OpenSsl.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbootstrapper.o /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libRuntime.WorkstationGC.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libeventpipe-disabled.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libRuntime.VxsortEnabled.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libstandalonegc-disabled.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libaotminipal.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libstdc++compat.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libz.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbrotlienc.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbrotlidec.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbrotlicommon.a -g -Wl,--build-id=sha1 -Wl,--as-needed -pthread -ldl -lrt -lm -static-pie -Wl,-z,relro -Wl,-z,now -Wl,--defsym,__xmknod=mknod -Wl,--eh-frame-hdr -Wl,--discard-all -Wl,--gc-sections" exited with code 1.

Build failed with 2 error(s) in 9.2s

That is cause I checked copied and pasted with clang -s ....

ld.lld: error: undefined symbol: __start___modules
>>> referenced by main.cpp:204 (/__w/1/s/src/runtime/src/coreclr/nativeaot/Bootstrap/main.cpp:204)
>>>               /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbootstrapper.o:(main)
>>> the encapsulation symbol needs to be retained under --gc-sections properly; consider -z nostart-stop-gc (see https://lld.llvm.org/ELF/start-stop-gc)

ld.lld: error: undefined symbol: __stop___modules
>>> referenced by main.cpp:204 (/__w/1/s/src/runtime/src/coreclr/nativeaot/Bootstrap/main.cpp:204)
>>>               /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbootstrapper.o:(main)
clang: error: linker command failed with exit code 1 (use -v to see invocation)

That is why - I resolved my copied and pasted line with clang if it doesn't happen with -Wl,-no-gc-sections

clang -s "obj/Release/net10.0/linux-x64/native/01_GettingStarted.o" -o "bin/Release/net10.0/linux-x64/native/01_GettingStarted" -Wl,--version-script="obj/Release/net10.0/linux-x64/native/01_GettingStarted.exports" -Wl,--export-dynamic -L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb -lXau -lXdmcp -L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb-util -lxcb -lXau -lXdmcp -L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb-module -gz=zlib -fuse-ld=bfd /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.Native.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.IO.Compression.Native.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.Net.Security.Native.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libSystem.Security.Cryptography.Native.OpenSsl.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbootstrapper.o /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libRuntime.WorkstationGC.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libeventpipe-disabled.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libRuntime.VxsortEnabled.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libstandalonegc-disabled.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libaotminipal.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libstdc++compat.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libz.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbrotlienc.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbrotlidec.a /home/deafman1983/.nuget/packages/microsoft.netcore.app.runtime.nativeaot.linux-x64/10.0.0-rc.1.25451.107/runtimes/linux-x64/native/libbrotlicommon.a -Wl,--as-needed -pthread -ldl -lrt -lm -fuse-ld=lld -static-pie -Wl,-z,relro -Wl,-z,now -Wl,--defsym,__xmknod=mknod -Wl,--eh-frame-hdr -Wl,--discard-all -Wl,--no-gc-sections

then it compiled successfully.
It works fine while I run testing app.

./01_GettingStarted
 Screen number is 0.
 Information of screen Handle: 0x3E1
	width.........: 1920
	height........: 1080
	depth.........: 24
	white pixel...: 0xFFFFFF
	black pixel...: 0x000000

 Hello printf from xcb-module!
 xcb-module is cool.

deafman1983@Jens-Ubuntu:~/Documents/CSharpProjects/Gtk4Sharp/Examples/XCB/01_GettingStarted/bin/Release/net10.0/linux-x64/native$ ldd ./01_GettingStarted
	statically linked
deafman1983@Jens-Ubuntu:~/Documents/CSharpProjects/Gtk4Sharp/Examples/XCB/01_GettingStarted/bin/Release/net10.0/linux-x64/native$ file ./01_GettingStarted
./01_GettingStarted: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), static-pie linked, for GNU/Linux 3.2.0, BuildID[xxHash]=5138af5618cfc448, stripped
deafman1983@Jens-Ubuntu:~/Documents/CSharpProjects/Gtk4Sharp/Examples/XCB/01_GettingStarted/bin/Release/net10.0/linux-x64/native$ ls -lh ./01_GettingStarted
-rwxrwxr-x 1 deafman1983 deafman1983 2.8M Sep 18 19:40 ./01_GettingStarted

That is why I have problem with -Wl,-gc-sections should be false -> -Wl,-no-gc-sections

My 01_GettingStarted with xcb + module + util

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <RootNamespace>01_GettingStarted</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
    <PublishAot>true</PublishAot>
    <TrimMode>link</TrimMode>
    <RuntimeIdentifier>linux-x64</RuntimeIdentifier>
    <InvariantGlobalization>true</InvariantGlobalization>
    <OptimizationPreference>Speed</OptimizationPreference>
    <!-- <IlcInstructionSet>avx2</IlcInstructionSet> -->
    <ObfuscateAssembly>true</ObfuscateAssembly>
    <ObfuscationAlgorithm>RENAMING</ObfuscationAlgorithm>
    <IlcGenerateCompleteTypeMetadata>false</IlcGenerateCompleteTypeMetadata>
    <IlcGenerateStackTraceData>false</IlcGenerateStackTraceData>
    <IlcTrimMetadata>true</IlcTrimMetadata>
    <IlcDisableReflection>true</IlcDisableReflection>
    <IlcRemoveAssemblies>true</IlcRemoveAssemblies>
    <IlcOptimizationPreference>Size</IlcOptimizationPreference>
    <StaticExecutable>true</StaticExecutable>
    <CompressionEnabled>false</CompressionEnabled>
    <AotAssemblies>true</AotAssemblies>
  </PropertyGroup>

  <ItemGroup>
    <!-- XCB -->
    <ProjectReference Include="..\..\..\DeafMan1983.Interop.XCB\DeafMan1983.Interop.XCB.csproj" />
    <DirectPInvoke Include="xcb" />
    <LinkerArg Include="-L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb -lXau -lXdmcp"/>
    <DirectPInvoke Include="xcb-util" />
    <LinkerArg Include="-L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb-util -lxcb -lXau -lXdmcp"/>
    <DirectPInvoke Include="xcb-module" />
    <LinkerArg Include="-L/opt/Gtk4Latest/lib/x86_64-linux-gnu -lxcb-module"/>

    <!-- Utilities for sbyte*<->string and Pixelmanipulations -->
    <PackageReference Include="DeafMan1983.Utilities" Version="1.3.1" />
  </ItemGroup>

</Project>

/opt/Gtk4Latest/lib/x86_64-linux-gnu that is custom sysroot for xcb, modified Gtk4 ( as Creative Tool Kit , still in Development. Nothing copied from real Gtk4 just I create simple lightweight GUI framework with xcb. )
Thanks!