Linux build failed

Development Getting Started & Setup
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1 
[1/3] Compile Module.VulkanShaderFormat.cpp
In file included from /home/mariusz/storage/UnrealEngine-4.27/Engine/Intermediate/Build/Linux/B4D820EA/ShaderCompileWorker/Development/VulkanShaderFormat/Module.VulkanShaderFormat.cpp:2:
In file included from /home/mariusz/storage/UnrealEngine-4.27/Engine/Source/Developer/VulkanShaderFormat/Private/VulkanBackend.cpp:38:
In file included from Developer/ShaderCompilerCommon/Public/ShaderCompilerCommon.h:6:
In file included from Runtime/RenderCore/Public/UniformBuffer.h:9:
In file included from Runtime/RenderCore/Public/ShaderParameterMacros.h:10:
In file included from Runtime/RenderCore/Public/ShaderParameterMetadata.h:12:
In file included from Runtime/RHI/Public/RHI.h:2315:
In file included from Runtime/RHI/Public/RHIUtilities.h:15:
In file included from Runtime/RHI/Public/RHICommandList.h:28:
In file included from Runtime/Core/Public/ProfilingDebugging/CsvProfiler.h:20:
In file included from ThirdParty/Linux/LibCxx/include/c++/v1/atomic:571:
In file included from ThirdParty/Linux/LibCxx/include/c++/v1/__threading_support:33:
/usr/include/semaphore.h:24:11: fatal error: 'bits/types/struct_timespec.h' file not found
# include <bits/types/struct_timespec.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [Makefile:933: ShaderCompileWorker] Error 6

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.6 LTS"

I’m following instruction from here: https://docs.unrealengine.com/4.27/en-US/SharingAndReleasing/Linux/BeginnerLinuxDeveloper/SettingUpAnUnrealWorkflow/

Any ideas?

2

I think you need to download some C++ libraries from the Ubuntu repository

3

POSIX (Pthreads)

4

Thank you for your reply.

Sorry I forgot to add. I do have it in system.

/usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h in system

None of me projects with default system include paths, complained when I tried add smaphore.h to it. So it seems to me that there is a problem with UE build system.

I try to create link to /usr/include/bits → /usr/include/x86_64-linux-gnu/bits, but that breaks in other beautiful ways :slight_smile:

FLY I’m using 4.27.2 release.

5

Maybe if you modify the Makefile and put the correct path it will work.
Or maybe you need to modify/create an environment variable.
Another option is that you copy all the files you need inside the this path.

They are just ideas, I really don’t know what the real problem is. I only see that the PATHs are different.

6

You should not need to edit the paths.
It seems like something about the compilation setup on your system is not correctly configured.
Have you installed “build-essential” ?
Can you build other programs on the same machine?

7

Yes, no issue with other C++ builds. As stated before I added semaphore.h to one of my projects main.cpp and it build fine. Build is using semaphore.h from /usr/include instead EU ThirdParty folder. I did checked my env settings and I’m not sure what could affect it.

8

Well, LibCxx/include/c++/v1/__threading_support makes it look like someone’s trying to replace part of the standard library, which is never a good idea.
If you want to do that kind of thing, you should use a Docker container or something similar, for hermetic isolation.
(“you” being whoever made that build rule.)

I can’t offer any other advice than using the standard tools (IWYU, strace, adding -MD to CFLAGS, and so on) to try to figure out what’s going on, and then figure out how to fix it with the minimal amount of surgery.