emar archiver tool.

[Bram Stolk]

emHello,

I found that emscripten comes with an archiver tool, called emar.
During final stage when I create my .js code, pulling in an archive with '-l' does not seem to work for me.
The symbols that reside in the archive are not found.

This is what I do:
With em++ -c I create .o files containing byte code.
With emar I combine .o bytecode files into an archive libfoo.a
Then I build my js with em++ main.cpp -lfoo
-> symbol not found.

If, for the last step, I remove the -lfoo, and supply the .o files directly on the command line, the .js code is successfully generated.

So in short: combining objects into an archive works fine when building native binary from source.
But it fails when building javascript using emscripten compiler.

Did anyone else hit this same issue?
Any idea why this is?

Thanks,

 Bram

[Bram Stolk]

I thought I would add that...

...putting libfoo.a on the command line, instead of -lfoo, makes the unresolved symbol go away, btw.

   bram

[Alon Zakai]

I think -lfoo syntax makes it use the library search path, so perhaps you need -I. to tell it to look in the current directory.

- Alon

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[Bruce Mitchener]

On Tue, Dec 24, 2013 at 11:57 AM, Alon Zakai <alonm...@gmail.com> wrote:

I think -lfoo syntax makes it use the library search path, so perhaps you need -I. to tell it to look in the current directory.

-L no?

 - Bruce

 

[Bram Stolk]

Thanks,

-L. fixes it indeed.

I was thrown off because I did not get a 'cannot find libfoo' which I would expect, instead just the missing symbols.

  Bram

[Alon Zakai]

I added a warning for that on the incoming branch now.

- Alon

[Mark Callow]

On 2013/12/24 8:38, Bram Stolk wrote:

I found that emscripten comes with an archiver tool, called emar.

Why does Emscripten need its own archiver tool?

Regards

    -Mark

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[Alon Zakai]

It's just a tiny python wrapper around llvm-ar. It lets projects with build systems using ar work as they expect to work, archives are created, they just contain LLVM bitcode instead of native code. Then finally we link those archives and build to JS.

- Alon

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