Building with Emscripten fails

[zikaari]

Followed this guide: http://kripken.github.io/emscripten-site/docs/compiling/Building-Projects.html#building-projects

These steps work without spitting non-zero exit code

# Run emconfigure with the normal configure command as an argument.
./emconfigure ./configure

# Run emmake with the normal make to generate linked LLVM bitcode.
./emmake make

But fails at last one : (

$ emcc src/.libs/libonig.a -s WASM=1 -o onig.js
error: Linking globals named 'regcomp': symbol multiply defined!
ERROR:root:Failed to run llvm optimizations:

At this point (4 days of struggle with all this) I'd owe anyone for life. Help much appreciated.

[kkos]

I don't know about Emscripten.
But regcomp() is a Oniguruma API function that provide POSIX API to user.
If you don't use Oniguruma POSIX API regcomp() etc.. you can remove it from libonig.a.
Please remove regposix.c and regposerr.c from src/Makefile.am.

[kkos]

I have added a new configure option "--enable-posix-api" in develop branch.

$ make clean
$ ./configure --enable-posix-api=no
$ make

[zikaari]

Thank you for being so nice!

I created the same issue in emscripten's repo and based on author's pointer, it turns out that regcomp symbol is also defined in libc.bc which I believe must be packed together with anything emscripten builds (WASM binary in this case)

libc.bc

sweetslush@ubuntu:~/.emscripten_cache/asmjs$ llvm-nm libc.bc | grep "regcomp"
-------- T regcomp

libonig.a

sweetslush@ubuntu:~/.../oniguruma$ llvm-nm src/.libs/libonig.a | grep "regcomp"
regcomp_64e0bb8d.o:
-------- T regcomp

In search for all possible solutions, will there be any side effects (missing features) of not including regposix.c and regposerr.c?

Or does regcomp from libc has same behaviour as regcomp in oniguruma?

Once again, I thank for being epic 🎉

[kkos]

regcomp() in Oniguruma provides POSIX interface to users by using Oniguruma regex engine.
If you don't use POSIX interface (regcomp, regexec, regfree etc.. defined in onigposix.h) to use Oniguruma and use only Oniguruma native interface (onig_new, onig_search etc.. defined in oniguruma.h) then you don't need regposix.c and regposerr.c.

[zikaari]

Everything's now nominal. Thank you for the help!

🙂