E Anciant wrote: > > Rene Brun wrote: > > > > Hi Christian, > > It seems that you compiled Root with the wrong options. > > The egcs compiler option -fno-rtti was probably missing. > > In our Makefile for Linux egcs, the CXXFLAGS parameter is > > CXXFLAGS = -Wall -fPIC -DR__GLIBC -fno-rtti -fno-exceptions > > > > I apologize for this very naive question but, why is it so important > to have the same flags when compiling our libraries than the ones > that were used to compile ROOT ? > It seems to me I spend my year long linking binaries with > libraries for which I have no idea of what flags were used .. > > I had a similar problem than Christian on Debian 2.0, with gcc, > root was working, > Compiling test was working, but not the follwoing case: > I was using two different classes, compiled into two different > shared libraries, the second class was using objects of > the first one. > When I was loading those 2 libraries interactively in root > (cint), > and when I was trying to use objects of the second class, > references to the first one were not resolved. > (not to say I was using the same flags that in test to compile > those libraries) > Would it be usefull to have an exemple of this type > in test, like for exemple having the Class Track being > compiled into a separate shared library than Event ? Hi Eric, I do not understand this problem. Root itself comes with several shared libs with interconnexions between libs. Under egcs, the important compiler option is -fno-rtti > > I also tried to recompiled ROOT with the Makefile provided > for this version of Debian & gcc, but the result was > core dumping, at this point I gave up, thinking > something is really messed up in this linux Box. > > Since I am writing this mail, I have another comment: > I am really willing to use the container classes provided > by ROOT. I am quite new to C++, in the tutorial > 37.Using the Collection Classes, I see that there are > many of them, and when I browse through their descriptions > I just realise the extent of my ignorance in C++, > I don't precisely know what a hash table, nor a double link list, > nor a map are, (I can guess, but I would feel more confortable with > a sound definitions), nor am I confident with the relationship > between a Class and its corresponding Iter class (why is there > one sometimes, none in other cases ??) It is also difficult to > browse through several mother classes to get what a container class > does. > Where could I got some sort of introduction to all the concepts that > are used in the container classes ? > Wouldn't it help a lot of us if such an introduction was provided > in root documentation, (or a link to documentations available on > the webb) ? > You can find an introduction with examples and pictures to the Root container class in the Root course 2 by Fons. You can import the 3 Root courses (ps files) from URL: http://root.cern.ch/root/Publications.html click on items Part1, Part2, Part3 Rene Brun > thanks a lot, > > eric > > PS: Since it looks like I only complain in this mail, let me add > that I do think ROOT is a great project. > > -- > ----- Eric Anciant ------------ > DAPNIA/SPhN - Bat 703 - Orme des merisiers > CE-SACLAY - 91191 GIF-SUR-YVETTE Cedex - FRANCE > Office: (33 - 1) 69 08 22 47 fax: (33-1) 69 08 75 84
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