Undefined reference error, even after specifying -L and -l flags

Question

I am trying to compile this package and keep getting an undefined reference to error. I copied and edited the final compiler code in the makefile to make sure the external libraries needed are called before the other libraries.

Here's the error,

<path>/libqroot.so: undefined reference to `TLatex::TLatex()'

TLatex.h is in <path>/ROOT/include , TLatex is defined in the library Graf(libGraf.so) and is in <path>/ROOT/lib

Here's the command,

g++ file.cxx -Wall -g  -ggdb -fPIC -pthread -m64
-I<root-path>/ROOT/include 
-I/usr/include 
-I./ 
-I/usr/include 
-I<root-path>/ROOT/include 
-I<project-path>/pkg/base/ 
-I<project-path>/pkg/dianaglobal/ 
-I<project-path>/pkg/globalrw/ 
-I<project-path>/pkg//coretools/ 
-L<project-path>/lib 
-L<root-path>/ROOT/lib 
-lqroot -lcoretools -lmathtools -lbase -lgsl -lgslcblas-lGui -lCore -lCint -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl -rdynamic -lGeom -lMinuit -lSpectrum -lMathMore -lMathCore -lThread -lRootAuth -lFoam
-o <project-path>/bin//file

Obviously there are no newline chars.

Please help me figure what's wrong.

Thank you.

andygavin · Accepted Answer · 2013-08-05 21:13:22Z

1

First make sure -lGraf is passed in, if the symbol is in libGraf.so. The order of the link line matters. For g++ a library containing the definition of a function should appear after any source files or object files which use it. So given the error you are seeing:

-lqroot -lGraf -lcoretools -lmathtools -lbase -lgsl -lgslcblas

http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#Link-Options

Further to you edit, this error will occur if your header files do not match your libraries.

edited Aug 5, 2013 at 21:13

answered Aug 5, 2013 at 6:56

andygavin

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1 Comment

xcorat Over a year ago

oops, sorry there's a big space between so u probably didn't see it. (Sorry added spaces to distinguish those in the terminal, and removed all but this)

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