Error while loading Ultralight libraries

[izolate]

Hi,

I've been following the steps in your "Getting Started with Muon" guide but cannot run the binary at the end. I get the following error:

$ ./cra-go
./cra-go: error while loading shared libraries: libWebCore.so: cannot open shared object file: No such file or directory

I assume this means it cannot find the Ultralight libraries in the current directory. However, they are present.

$ pwd
/home/me/muon/examples/create-react-app

$ ls
b0x.yml  cra-go  go.mod  go.sum  libAppCore.so  libUltralightCore.so  libUltralight.so  libWebCore.so  main.go  public  README.md  webfiles

Any help would be greatly appreciated. Thanks!

[stephane-r]

Same result with same example projet 👍

I've try to webfiles folder to test too :)

[ImVexed]

This is due to how Linux resolves shared objects but I failed to mention it in the getting started document. Right now it's only checking your system /var/lib(?) directory for the libraries not the local directory. This can be immediately resolved by setting the environment variable LD_LIBRARY_PATH=. or whatever folder you have the libraries in.

In the future I'd like to use -rpath to statically set the resolution path in the binary but want to find an easy way to abstract control of the path to end users so for now just use that environment variable.

[ImVexed]

Added instructions in getting started with: 7b2e8cb

New issue tracked by: #26

[brandonros]

I think there is an issue here for Mac users too:

$ ls -l
total 128200
-rw-r--r--   1 bros  staff       180 Oct 10 15:27 README.md
-rw-r--r--   1 bros  staff      1704 Oct 10 15:27 b0x.yml
-rwxr-xr-x   1 bros  staff  11805572 Oct 10 16:12 cra-go
-rw-r--r--   1 bros  staff       149 Oct 10 15:27 go.mod
-rw-------   1 bros  staff       725 Oct 10 16:12 go.sum
-rw-r--r--@  1 bros  staff    228772 Oct  8 23:32 libAppCore.dylib
-rw-r--r--@  1 bros  staff    241208 Oct  8 14:01 libUltralight.dylib
-rw-r--r--@  1 bros  staff   1053192 Oct  7 13:56 libUltralightCore.dylib
-rw-r--r--@  1 bros  staff  52280884 Oct  6 23:03 libWebCore.dylib
-rw-r--r--   1 bros  staff       478 Oct 10 15:27 main.go
drwxr-xr-x  10 bros  staff       320 Oct 10 15:28 public
drwxr-x---   3 bros  staff        96 Oct 10 16:11 webfiles

$ go run main.go
dyld: Library not loaded: @rpath/libUltralightCore.dylib
  Referenced from: /var/folders/32/0hc42gv939q0s8hw62_l74jw0000gn/T/go-build523760123/b001/exe/main
  Reason: image not found
signal: abort trap

[ImVexed]

@brandonros does setting LD_LIBRARY_PATH have no effect on this?

[rareinator]

@brandonros does setting LD_LIBRARY_PATH have no effect on this?

@ImVexed I just tested this, and it does not seem to make any difference. I also tried setting the DYLD_LIBRARY_PATH. This also did not work

[ImVexed]

does go build -ldflags="-r ." have any effect? I haven't had time to test, but that should set @rpath to the current directory, if not, try playing around with it until it points to the right directory that libUltralightCore.dylib resides in

[rareinator]

That actually works like a charm, just can't use it on the go run main.go but if I build it, and then run the ./cra-go it works perfectly. 😄

[ImVexed]

Awesome, this has been documented at: https://github.com/ImVexed/muon/blob/master/README.md#q-my-program-cant-find-libultralightcoresodylib-even-though-its-in-the-same-directory

[danawoodman]

@ImVexed this documentation is no longer in the readme and the note on the getting started page isn't helpful. Would be really nice to have better docs on how to get this to work with go run and go build.

That said, go build -ldflags="-r ." also works for me to get the hello world working 👍

[ImVexed]

@danawoodman It's right here: https://github.com/ImVexed/muon/blob/master/README.md#q-i-get--libwebcoreso-cannot-open-shared-object-file

I just reformatted the phrasing. I'm also not sure that -r has any effect when using go run so I'm unaware of any workarounds at this time.