help with dl module and clang

[Daniel Braniss]

> 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
>