FLTK compile error with gcc

Question

I am trying to compile my first FLTK file. First I compiled it by gcc with -lfltk option, and I got this error:

/usr/bin/ld: /tmp/ccX7sPxQ.o: undefined reference to symbol '__gxx_personality_v0@@CXXABI_1.3'
/usr/lib/x86_64-linux-gnu/libstdc++.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Why do I get this error message? If I use g++ instead, it just compiles it.

edit. fltk-config --cxxflags returns:

-I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include 
-I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12   
-I/usr/include/freetype2 -I/usr/include/cairo -I/usr/include/glib-2.0 
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 
-I/usr/include/libpng12    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT

It might help to provide the output of `fltk-config [--] --cflags / cxxflags / ldflags / compile` - see also: [`man fltk-config`](http://linux.die.net/man/1/fltk-config). If you're not using `g++`, what are you using? `clang`? In short, you need to provide more information. — Brett Hale, Feb 11 '14 at 06:13

score 4 · Accepted Answer · answered Feb 11 '14 at 12:13

4

-lfltk is not enough to build a minimal FLTK-based application.

I strongly suggest you to read the following page: http://www.fltk.org/doc-1.3/basics.html . It clearly explains how to compile a simple FLTK program.

Assuming your FLTK application is not using extra FLTK libraries (opengl, images, forms) and is in a single file, called myfltkapp.cpp, the absolutely quickest way to compile and link it properly would be:

fltk-config --compile myfltkapp.cpp

answered Feb 11 '14 at 12:13

DejanLekic

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I didn't know that fltk-config can actually compile a cxx code. Thanks. – Jiho Noh Feb 11 '14 at 15:33
One million upvotes. How is this not part of every tutorial? – eric May 28 '18 at 02:37

score 1 · Answer 2 · edited May 23 '17 at 12:33

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I guess the reason I got the error comes from the difference between gcc and g++. I thought I could compile it by gcc with fltk library, but gcc does not link c++ standard library automatically. Thus you have to include the C++ standard library for gcc. It was a silly question.

gcc myfltkapp.cpp -lstdc++ -lfltk

What is the difference between g++ and gcc?

edited May 23 '17 at 12:33

Community

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answered Feb 11 '14 at 19:32

Jiho Noh

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FLTK compile error with gcc

2 Answers2