[swift-users] X11/Xlib linker error

[Alex Blewitt]

> On 21 May 2017, at 20:48, Kelvin Ma via swift-users <swift-users at swift.org> wrote:
> 
> I’m trying to get Swift working with X11, and I keep getting this linker error when I try to compile:
> 
> ~/dev/cloudgen$ swift build -v
> /usr/bin/lsb_release -r
> /home/kelvin/devtools/swift-3.1-dev/usr/bin/swiftc --driver-mode=swift -I /home/kelvin/devtools/swift-3.1-dev/usr/lib/swift/pm -L /home/kelvin/devtools/swift-3.1-dev/usr/lib/swift/pm -lPackageDescription /home/kelvin/dev/cloudgen/Package.swift -fileno 5
> /home/kelvin/devtools/swift-3.1-dev/usr/bin/swift-build-tool -f /home/kelvin/dev/cloudgen/.build/debug.yaml -v
> '/home/kelvin/devtools/swift-3.1-dev/usr/bin/swiftc' -Xlinker '-rpath=$ORIGIN' -g -L/home/kelvin/dev/cloudgen/.build/debug -o /home/kelvin/dev/cloudgen/.build/debug/cloudgen '-lX11' -emit-executable /home/kelvin/dev/cloudgen/.build/debug/cloudgen.build/main.swift.o
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:22: error: undefined reference to 'XOpenDisplay'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:29: error: undefined reference to 'XDefaultScreenOfDisplay'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:35: error: undefined reference to 'XCreateSimpleWindow'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:38: error: undefined reference to 'XSelectInput'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:41: error: undefined reference to 'XMapWindow'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:47: error: undefined reference to 'XNextEvent'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:52: error: undefined reference to 'XFillRectangle'
> /home/kelvin/dev/cloudgen/Sources/cloudgen/main.swift:53: error: undefined reference to 'XDrawString'
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> <unknown>:0: error: link command failed with exit code 1 (use -v to see invocation)
> <unknown>:0: error: build had 1 command failures
> 
> Here is the module.modulemap file I am using:
> 
> module X11 [system] {
>   module Xlib {
>     header "/usr/include/X11/Xlib.h"
>   }
>   module X {
>     header "/usr/include/X11/X.h"
>   }
>   link "X11"
> }

If they are umbrella headers that include other header file dependencies, you may need an 'export *' in order to make them visible -- otherwise you only get the contents of that header file.

http://clang.llvm.org/docs/Modules.html#export-declaration <http://clang.llvm.org/docs/Modules.html#export-declaration>

Alex

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