help with dl module and clang

[Daniel Braniss]

> On 3 Nov 2018, at 17:58, Daniel Braniss <danny at cs.huji.ac.il> wrote:
> 
> 
> 
>> On 3 Nov 2018, at 17:47, Dimitry Andric <dim at FreeBSD.org> wrote:
>> 
>> On 3 Nov 2018, at 15:51, Daniel Braniss <danny at cs.huji.ac.il> wrote:
>>> 
>>> I have a program that loads some modules via dlopen(),  these modules call some routines
>>> which are in the main program, this works when using gcc, but with cc it does not.
>>> 
>>> when compiling the main program I use  -export-dynamic, and the modules link fine when compiled with
>>> gcc, but when compiling with clang/cc i get dlerror: ...Undefined symbol …
>>> BTW, when linking the main program with cc I get
>>> 	/usr/bin/ld: warning: cannot find entry symbol xport-dynamic; defaulting to 0000000000402140
>> 
>> Instead of using -export-dynamic (which is a linker flag) as a flag to
>> cc, try using -Wl,-export-dynamic instead.  Now, the linker interprets
>> this as the -e flag, which is something totally different.
>> 
> 
> i had tried that before but i had -WI (upper case i) but re-reading the manual
> it should be-Wl (lower case l as in lima :-))!!!!!
> 
> thanks!!!!!!
> 
> and now have to try profiling (gprof) which started this mess,
> 
> thanks again!!
> 
> danny
> 
> 
>> I think this will also help with the exporting of the symbols of your
>> main program.
>> 
>> -Dimitry
>> 
> 
ok, new problem, it also happens with gcc:

when compiling the main program with flag -pg (gprof)
dlopen fails with dlerror: Service unavailable

what magic is needed now?

danny

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