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Cannot build ShaderCompileWorker

After building the latest git release branch on Fedora 29 I got the following error when running UE4Editor:

 Couldn't launch .../UnrealEngine/Engine/Binaries/Linux/ShaderCompileWorker! Make sure you build ShaderCompileWorker.

Then I manually tried to build ShaderCompileWorker like this:

 ./Engine/Build/BatchFiles/Linux/Build.sh ShaderCompileWorker Linux Development -verbose

and received the following linker errors:

 Performing 6 actions (10 in parallel)
 [1/6] Link (ld) libUnrealHeaderTool-BuildSettings.so
 .../UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v12_clang-6.0.1-centos7/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-ld: cannot find crti.o: No such file or directory
 .../UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v12_clang-6.0.1-centos7/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-ld: cannot find crtbeginS.o: No such file or directory
 clang++: error: linker command failed with exit code 1 (use -v to see invocation)
 ERROR: UBT ERROR: Failed to produce item: .../UnrealEngine/Engine/Binaries/Linux/libUnrealHeaderTool-BuildSettings.so

I located the missing objects in


added these folders to LIBRARY_PATH, but the build still results in the same error.

 export LIBRARY_PATH=/usr/lib64:/usr/lib/gcc/x86_64-redhat-linux/8/

Any help would be appreciated.


Product Version: UE 4.21
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asked Feb 11 '19 at 11:10 AM in Linux

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Is the toolchain complete? The file should be located at Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v12_clang-6.0.1-centos7/x86_64-unknown-linux-gnu/usr/lib64/crti.o

Please check that you have it there, and if you don't delete the toolchain and run Engine/Build/BatchFiles/Linux/SetupToolchain.sh again.

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answered Feb 11 '19 at 02:11 PM

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avatar image gabor.papp Feb 11 '19 at 02:32 PM

Thank you. I'm not sure while the toolchain was not complete first, but this fixed it.

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