Problem linking root libraries with g++-4.6 compiler

ROOT
1

Dear experts,

I work with Ubuntu 11.10.
The default compiler is g+±4.6
I installed root_v5.32.00 by compiling the source with g+±4.6 with no problem.

Here is the configure command I used:
./configure linuxx8664gcc --with-x11-libdir=/usr/lib/x86_64-linux-gnu/
–with-xft-libdir=/usr/lib/x86_64-linux-gnu/ --with-xext-libdir=/usr/lib/x86_64-linux-gnu/

config.log file in attachment.

I run “source /bin/thisroot.sh” to define the necessary environment variables for binaries and libraries:
gianluca@vip09:~ source MySoftware/root_v5.32.00/bin/thisroot.sh gianluca@vip09:~ env | grep root
MANPATH=/home/gianluca/MySoftware/root_v5.32.00/man:/usr/local/man:/usr/local/share/man:/usr/share/man
LD_LIBRARY_PATH=/home/gianluca/MySoftware/root_v5.32.00/lib
LIBPATH=/home/gianluca/MySoftware/root_v5.32.00/lib
PATH=/home/gianluca/MySoftware/root_v5.32.00/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
ROOTSYS=/home/gianluca/MySoftware/root_v5.32.00
DYLD_LIBRARY_PATH=/home/gianluca/MySoftware/root_v5.32.00/lib
PYTHONPATH=/home/gianluca/MySoftware/root_v5.32.00/lib
SHLIB_PATH=/home/gianluca/MySoftware/root_v5.32.00/lib

/bin/root works perfectly, CINT show no problem when I compile from terminal
.L src/CreateSimpleEventTree.cxx+

same code fails to compile with g+±4.6

/usr/bin/g+±4.6 -L/home/gianluca/MySoftware/root_v5.32.00/lib -lCore -lCint -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl -rdynamic -O2 -pipe -m64 -Wshadow -Wall -W -Woverloaded-virtual -fPIC -Iinclude/ -pthread -m64 -I/home/gianluca/MySoftware/root_v5.32.00/include src/CreateSimpleEventTree.cxx -o bin/CreateSimpleEventTree
/tmp/ccQeRVWy.o: In function main': CreateSimpleEventTree.cxx:(.text.startup+0x21): undefined reference to TString::TString(char const*)’
CreateSimpleEventTree.cxx:(.text.startup+0x41): undefined reference to operator<<(std::basic_ostream<char, std::char_traits<char> >&, TString const&)' CreateSimpleEventTree.cxx:(.text.startup+0x53): undefined reference to TString::~TString()’
CreateSimpleEventTree.cxx:(.text.startup+0x7e): undefined reference to `TString::~TString()’
collect2: ld returned 1 exit status

but g+±4.4 is successful
/usr/bin/g+±4.4 -L/home/gianluca/MySoftware/root_v5.32.00/lib -lCore -lCint -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl -rdynamic -O2 -pipe -m64 -Wshadow -Wall -W -Woverloaded-virtual -fPIC -Iinclude/ -pthread -m64 -I/home/gianluca/MySoftware/root_v5.32.00/include src/CreateSimpleEventTree.cxx -o bin/CreateSimpleEventTree
CreateSimpleEventTree compiled.
all done!

What am I doing wrong?

Thanks for helping out.

gianluca
config.txt (219 KB)

2

Hi,

The problem is the order of the libraries on the link line. How is it determined in your case (i.e. did you use root-config --libs)?

Philippe.

3

Hi Philippe,

yes I used the following command:

root-config --libs
-L/home/gianluca/MySoftware/root_v5.32.00/lib -lCore -lCint -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl -rdynamic

4

Hi,

Try listing the source file before the library (i.e. something lie:/usr/bin/g++-4.6 -rdynamic -O2 -pipe -m64 -Wshadow -Wall -W -Woverloaded-virtual -fPIC -Iinclude/ -pthread -m64 -I/home/gianluca/MySoftware/root_v5.32.00/include src/CreateSimpleEventTree.cxx -o bin/CreateSimpleEventTree -L/home/gianluca/MySoftware/root_v5.32.00/lib -lCore -lCint -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl

Cheers,
Philippe.

5

Hi Philippe,

thank you very much, placing the root library after the source made it work with g+±4.6.

/usr/bin/g++-4.6 -Iinclude/ -pthread -m64 -I/home/gianluca/MySoftware/root_v5.32.00/include src/CreateSimpleEventTree.cxx tmp/MyDict.o tmp/MyEventClass.o -o bin/CreateSimpleEventTree -L/home/gianluca/MySoftware/root_v5.32.00/lib -lCore -lCint -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl -rdynamic CreateSimpleEventTree compiled. all done!

anyway… why is that? what’s the difference with g+±4.4?

Thank you again

gianluca

6

Hi,

They have updated the linking rules to make same (intentionally) more stringent (and respect ordering 'more).

Cheers,
Philippe.

7

Ah, that makes sense.

OK, thanks for the information, and many thanks for helping out.

Best,

Gianluca