Trying to build Swift 4.1 via Flatpak, but the Clang build doesn't have all of the include paths

I've been trying to build Swift for Flatpak, and...well, it starts perfectly fine. Key word: starts.

Once LLVM and Clang are built, I get errors like this:

/run/build/swift/llvm/include/llvm/Support/AlignOf.h:18:10: fatal error: 'cstddef' file not
      found
#include <cstddef>
         ^~~~~~~~~
1 error generated.

Further research (-v) shows that the Swift-built version of Clang isn't passing the appropriate include (or library) directories:

clang -cc1 version 5.0.0 based upon LLVM 5.0.0 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/app/include"
ignoring nonexistent directory "/usr/usr/local/include"
ignoring nonexistent directory "/usr/usr/include"
#include "..." search starts here:
#include <...> search starts here:
 stdlib/public/Reflection
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/swift/stdlib/public/Reflection
 include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/swift/include
 /run/build/swift/llvm/include
 /run/build/swift/build/Ninja-ReleaseAssert/llvm-linux-x86_64/include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/build/Ninja-ReleaseAssert/llvm-linux-x86_64/tools/clang/include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/llvm/tools/clang/include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/cmark/src
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/build/Ninja-ReleaseAssert/cmark-linux-x86_64/src
 /run/build/swift-2/build/Ninja-ReleaseAssert/llvm-linux-x86_64/lib/clang/5.0.0/include
 /usr/include
End of search list.

You can see that there are no C++ include paths.

For comparison, this is what Flatpak's system Clang binaries show:

clang -cc1 version 4.0.1 based upon LLVM 4.0.1 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/app/include"
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 stdlib/public/Reflection
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/swift/stdlib/public/Reflection
 include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/swift/include
 /run/build/swift/llvm/include
 /run/build/swift/build/Ninja-ReleaseAssert/llvm-linux-x86_64/include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/build/Ninja-ReleaseAssert/llvm-linux-x86_64/tools/clang/include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/llvm/tools/clang/include
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/cmark/src
 /home/ryan/stuff/org.freedesktop.Sdk.Extension.swift-real/.flatpak-builder/build/swift-2/build/Ninja-ReleaseAssert/cmark-linux-x86_64/src
 /usr/bin/../lib/x86_64-unknown-linux/6.2.0/../../../include/c++/6.2.0
 /usr/bin/../lib/x86_64-unknown-linux/6.2.0/../../../include/c++/6.2.0/x86_64-unknown-linux
 /usr/bin/../lib/x86_64-unknown-linux/6.2.0/../../../include/c++/6.2.0/backward
 /usr/bin/../lib/clang/4.0.1/include
 /usr/include
End of search list.

TL;DR: Several include paths are missing, and the same goes for library directories (/usr/lib/x86_64-linux-linux, in particular, is missing).

I'm guessing there's some option I need to pass to build-script to make the shiny new Clang binaries pick up the correct directories...but what are they?

1 Like

Did you ever figure this out? I'm seeing similar issues on EC2

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