[swift-users] Swift linux repl can't import

[Will Stanton]

From https://bugs.swift.org/browse/SR-3648, the work-around seems to be passing -I /path/to/extracted/usr/lib/swift/clang/include when invoking swift (credit Lukas and others, SR-3794 is more active)
So, ex. `swift -I ~/a-swift/usr/lib/swift/clang/include/`

Fortunately, the issue has only come up for me in the REPL. `swift build` works fine: I can build packages without an awkward -Xswiftc…

I wonder if the issue has anything to do with the clang-builtin-headers install component? (Maybe swiftc/something gets hardcoded with a path somewhere?)

Would be interested in learning more about install options, toolchains, and the build! I’ve been wanting to track down for a while now, how does --install-prefix affect the build? I’ve been relying on install_destdir to get a swift...

Regards,
Will Stanton

> On Apr 4, 2017, at 9:17 PM, Rick Mann via swift-users <swift-users at swift.org> wrote:
> 
> The installation instructions for Swift on Linux imply that the tarball can be extracted anywhere, and the PATH set, and all should be well. But unfortunately, while that's partly true, when I try to import packages, it fails (Ubuntu 16.04 on Parallels on macOS 10.12.3):
> 
> $ swift
> Welcome to Swift version 3.1 (swift-3.1-RELEASE). Type :help for assistance.
>  1> 1+1
> $R0: Int = 2
>  2> import Glibc
> <module-includes>:3:10: note: in file included from <module-includes>:3:
> #include "///usr/include/utmp.h"
>         ^
> 
> ///usr/include/utmp.h:23:10: note: in file included from ///usr/include/utmp.h:23:
> #include <sys/types.h>
>         ^
> 
> error: /usr/include/x86_64-linux-gnu/sys/types.h:146:10: error: 'stddef.h' file not found
> #include <stddef.h>
>         ^
> 
> error: could not build Objective-C module 'SwiftGlibc'
> 
>  2>
> 
> I'm guessing it really wants Swift to live inside /usr?