Re: Cross-compiling on Fedora 12

for example, to compile and link the small program in attachment on Linux, you simply have to do:

g++ -o hsimple hsimple.C -I$ROOTSYS/include -L$ROOTSYS/lib -lCore -lCint -lRIO -lHist -lTree -lm -ldl -rdynamic

Rene Brun

Vassili Maroussov wrote:
> Tried various things, but nothing worked. Finally compiled ROOT on Sun
> VirtualBox with Fedora 12 i686 installed and copied the tree obtained
> with "make install" to the x86_64 host. Now I can link ROOT libraries
> to FLUKA and have the ROOT output with it, but wondered what parts of
> that ROOT i686 directory tree if I want only:
>
> - Generate object dictionaries with rootcint, use ClassDef and
> ClassImp macros;
> - Use ROOT Collections, TTree and TFile with output only into local files
>
> Regards,
>
> Vassili
>
> On 03/01/2010 09:15 PM, Philippe Canal wrote:
>> Hi,
>>
>> rootcint still only generate the dictionary (it only call g++ when
>> the option -p is passed ... and then __only__ has a pre-processor).
>>
>> So my guess is that core/utils/src/rootcint_tmp is built/linked
>> incorrectly and can not start.
>>
>> Cheers,
>> Philippe.
>>
>> -----Original Message-----
>> From: owner-roottalk_at_root.cern.ch
>> [mailto:owner-roottalk_at_root.cern.ch] On
>> Behalf Of Konstantin Olchanski
>> Sent: Monday, March 01, 2010 2:12 PM
>> To: Vassili Maroussov
>> Cc: roottalk_at_lxbuild091.cern.ch
>> Subject: Re: [ROOT] Cross-compiling on Fedora 12
>>
>> On Sat, Feb 27, 2010 at 01:03:27PM +0100, Vassili Maroussov wrote:
>>
>>> Generating dictionary core/meta/src/G__TCint.cxx...
>>> core/utils/src/rootcint_tmp -cint -f core/meta/src/G__TCint.cxx -c
>>> -DG__API core/meta/inc/TCint.h core/meta/inc/LinkDef_TCint.h
>>> /usr/bin/ld: i386:x86-64 architecture of input file
>>> `/usr/lib/gcc/x86_64-redhat-linux/3.4.6/libfrtbegin.a(frtbegin.o)' is
>>> incompatible with i386 output
>>> /usr/bin/ld: final link failed: Invalid operation
>>> collect2: ld returned 1 exit status
>>> make: *** [bin/g2root] Error 1
>>>
>>
>> Looks like "rootcint" is calling GCC without the "-m32" flag and
>> "/usr/bin/ld"
>> tries to link against the 64-bit runtime library (libfrtbegin.a).
>>
>> To be extra user friendly, it (rootcint or Makefile) hides the actual
>> GCC
>> command line,
>> so it is hard to tell what it going on there.
>>
>> But perhaps I am confused - it looks as if "rootcint" generates the
>> dictionary source
>> file and immediately call GCC to compile it. That used to be 2 different
>> steps
>> in the Makefile and it was easy to add "-m32" to the right place to
>> fix it.
>>
>> If rootcint invokes GCC directly, it should accept the "-m32/-m64"
>> switch
>> and pass
>> it to GCC as we cannot read the user mind to tell how they want
>> things to be
>> compiled.
>>
>>
>>
>