Philippe Canal wrote:
>
> > I also tried the following approach:
> >
> > Func_t test2 = gSystem->DynFindSymbol(
> > "/home/sas/src/ana/macros/test2.so", "test2" );
>
> I answer this last question for completness but recommend against using something
> like that.
> Func_t is a pointer to a function, could you cast it to
> the proper type (assuming you know it) and use it like:
>
> typedef int (*testfunct)();
>
> ....
> testfunc test2 = (testfunc)gSystem->
> DynFindSymbol("/home/sas/src/ana/macros/test2.so", "test2" );
> ....
Hi Philippe,
thanks for your reply. Your "class approach" is actually more or less
what I had in mind, when I started to test this "runtime compiling
procedure". Up to now I had used the Dictionary mechanisms in a black
box fashion as it wasn't really clear to me what you gain. I beginning
to see this now thanks to your example (altough I still have problems,
see below).
I found out about Func_t after I posted my message and agree that I
don't want to use that. Especially since the symbol is not "test2" but
"test2__Fv" for a void function and changes to "test2__FPi" for a void
function passing a pointer to int... I don't want to guess or "nm |
grep" for the symbol every time I change the parameter list... :-)
So I immediately set out and tried your example last night. I ran into
the following problem. Compiling the thing works, but running gives
(sorry for the lengthy pastes):
-------------------------------------------------
sas@galileo:~/src/ana/macros > ./test
Compiling...
Creating shared library /home/sas/src/ana/macros/AllTasks.so
/tmp/fileLfq2y1.C:1: /home/sas/src/ana/macros/AllTasks.C++: No such file
or directory
Warning: link requested for unknown srcfile
/home/sas/src/ana/macros/./AllTasks.h FILE:/tmp/fileawxUBDlinkdef.h
LINE:11
Warning: link requested for unknown srcfile
/home/sas/src/ana/macros/AllTasks.C++ FILE:/tmp/fileawxUBDlinkdef.h
LINE:12
Note: operator new() masked 1c
Note: operator delete() masked 1c
g++: fileotApTT.C++: linker input file unused since linking not done
g++: fileotApTT.o: No such file or directory
Creating shared library /home/sas/src/ana/macros/test2.so
/tmp/fileQvujrK.C:1: /home/sas/src/ana/macros/test2.C++: No such file or
directory
Warning: link requested for unknown srcfile
/home/sas/src/ana/macros/test2.C++ FILE:/tmp/filea9glRelinkdef.h LINE:11
Note: operator new() masked 1c
Note: operator delete() masked 1c
g++: filezJsUaI.C++: linker input file unused since linking not done
g++: filezJsUaI.o: No such file or directory
*** Break *** segmentation violation
Aborted
-------------------------------------------------
I'm using root-2.25.03, compiled from source on linux/ppc. I figured
CompileMacro chokes on the "++", so I removed it and got
-------------------------------------------------
sas@galileo:~/src/ana/macros > ./test
Compiling...
Creating shared library /home/sas/src/ana/macros/AllTasks.so
Note: operator new() masked 1c
Note: operator delete() masked 1c
Class AllTasks::R__Init: Streamer() not declared
Class AllTasks::R__Init: ShowMembers() not declared
dlopen error: /home/sas/src/ana/macros/AllTasks.so: undefined symbol:
Dictionary__8AllTasks
Load Error: Dynamic link library /home/sas/src/ana/macros/AllTasks.so
can not load
/usr/lib/crt1.o(.rodata+0x4): undefined reference to `main'
filelqQLZk.o: In function `operator>>(TBuffer &, AllTasks *&)':
filelqQLZk.o(.text+0x74): undefined reference to `AllTasks::Class(void)'
filelqQLZk.o: In function `AllTasks::ShowMembers(TMemberInspector &,
char *)':
filelqQLZk.o(.text+0xf4): undefined reference to `AllTasks::Class(void)'
filelqQLZk.o: In function
`G__AllTasks_Class_3_0__FP8G__valuePCcP8G__parami':
filelqQLZk.o(.text+0x654): undefined reference to
`AllTasks::Class(void)'
filelqQLZk.o: In function
`G__AllTasks_Dictionary_6_0__FP8G__valuePCcP8G__parami':
filelqQLZk.o(.text+0x714): undefined reference to
`AllTasks::Dictionary(void)'
filelqQLZk.o: In function
`G__AllTasks_ImplFileName_2_1__FP8G__valuePCcP8G__parami':
filelqQLZk.o(.text+0x948): undefined reference to
`AllTasks::ImplFileName(void)'filelqQLZk.o: In function
`G__AllTasks_ImplFileLine_3_1__FP8G__valuePCcP8G__parami':
filelqQLZk.o(.text+0x998): undefined reference to
`AllTasks::ImplFileLine(void)'filelqQLZk.o(.got2+0x34): undefined
reference to `AllTasks::Dictionary(void)'
filelqQLZk.o(.got2+0x220): undefined reference to
`AllTasks::Dictionary(void)'
filelqQLZk.o: In function `AllTasks::IsA(void) const':
filelqQLZk.o(.AllTasks::gnu.linkonce.t.IsA(void) const+0xc): undefined
reference to `AllTasks::Class(void)'
collect2: ld returned 1 exit status
Creating shared library /home/sas/src/ana/macros/test2.so
Note: operator new() masked 1c
Note: operator delete() masked 1c
Class MyTask::R__Init: Streamer() not declared
Class MyTask::R__Init: ShowMembers() not declared
dlopen error: /home/sas/src/ana/macros/test2.so: undefined symbol:
__ti4TAna
Load Error: Dynamic link library /home/sas/src/ana/macros/test2.so can
not load
/usr/lib/crt1.o(.rodata+0x4): undefined reference to `main'
fileRz0iqc.o: In function `MyTask::Streamer(TBuffer &)':
fileRz0iqc.o(.text+0x240): undefined reference to
`TAna::Streamer(TBuffer &)'
fileRz0iqc.o: In function `MyTask::ShowMembers(TMemberInspector &, char
*)':
fileRz0iqc.o(.text+0x2c4): undefined reference to
`TAna::ShowMembers(TMemberInspector &, char *)'
fileRz0iqc.o(.got2+0x254): undefined reference to `TAna type_info node'
fileRz0iqc.o: In function `MyTask type_info function':
fileRz0iqc.o(.gnu.linkonce.t.__tf6MyTask+0x38): undefined reference to
`TAna type_info function'
/home/sas/src/ana/macros/AllTasks.so: undefined reference to
`AllTasks::ImplFileLine(void)'
/home/sas/src/ana/macros/AllTasks.so: undefined reference to
`AllTasks::Class(void)'
/home/sas/src/ana/macros/AllTasks.so: undefined reference to
`AllTasks::Dictionary(void)'
/home/sas/src/ana/macros/AllTasks.so: undefined reference to
`AllTasks::ImplFileName(void)'
collect2: ld returned 1 exit status
*** Break *** segmentation violation
Aborted
-------------------------------------------------
If I compare this setup to my Eventlib thing, I note that the rootcint
stuff to generate the LinkDef.C is missing. Is this generated by
CompileMacro automatically? I tried adding it by hand but it wouldn't
help. I admit this Dictionary thing is still a bit of a mystery to me.
I'm looking forward to the new docs ;-)
TIA,
Sven
This archive was generated by hypermail 2b29 : Tue Jan 02 2001 - 11:50:36 MET