I'd like to not re-implement all the REPL boiler-plate, like
~~~
ios_puts("\njulia> ", ios_stdout);
ios_flush(ios_stdout);
line = ios_readline(ios_stdin);
~~~
and so on.
In effect, I want to launch the usual julia REPL, but call some of my own
initialization procedures before julia_init.
My motivation is that I want to call an external library that dies horribly
due to the LLVM symbols present if loaded after julia_init is called, see
also https://github.com/JuliaLang/julia/issues/12644.
The only way I've managed to do it is to recompile the julia binary, I
figured I could re-use the repl code by just dynamically loading it.
On Sunday, 24 July 2016 19:55:00 UTC+2, Yichao Yu wrote:
>
> On Sun, Jul 24, 2016 at 1:21 PM, Joosep Pata <[email protected]
> <javascript:>> wrote:
> > Hi,
> >
> > I'd like to compile ui/repl.c into a shared library so that I could
> dlopen julia after some other initialization procedures that would
> otherwise conflict with the LLVM linked to julia.
>
> You should **NOT** compile `ui/repl.c` since it will fail as you saw.
> You should just use `libjulia.so`, why is it not enough? `ui/repl.c`
> is just a very thin wrapper and should have nothing to do with LLVM or
> whatever conflict you saw.
>
> >
> > I succeeded in doing that on OSX using:
> >
> > ~~~
> > diff --git a/ui/Makefile b/ui/Makefile
> > +julia-release: $(build_bindir)/julia$(EXE)
> $(build_private_libdir)/librepl.$(SHLIB_EXT)
> > ...
> > +$(build_private_libdir)/librepl.$(SHLIB_EXT): $(OBJS)
> > + @$(call PRINT_LINK, $(CXXLD) -shared $(CXXFLAGS) $(CXXLDFLAGS)
> $(LINK_FLAGS) $(SHIPFLAGS) $^ -o $@ -L$(build_private_libdir)
> -L$(build_libdir) -L$(build_shlibdir)
> > ~~~
> >
> > so I can call julia dynamically as
> > ~~~
> > my_init(); // initalize stuff that hides its LLVM symbols after loading
> > ...
> > void* handle_julia = dlopen(LIBJULIAREPL, RTLD_NOW | RTLD_GLOBAL);
> > ...
> > typedef int (*t_jl_main)(int, char**);
> > t_jl_main jl_main = (t_jl_main)dlsym(handle_julia, "main");
> > return jl_main(argc, argv);
> > ~~~
> >
> > On linux, I get strange linker errors:
> > `/usr/bin/ld: repl.o: relocation R_X86_64_TPOFF32 against
> `tls_states.12084' can not be used when making a shared object; recompile
> with -fPIC`
> >
> > As far as I can tell, julia uses fPIC throughout. Has anyone encountered
> something like this before? Google links to some old gcc bugs and a go
> linker issue but it's not evident if there is a fix.
> >
> > Cheers,
> > Joosep
>
