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On 10/27/20 11:01 AM ken williams wrote:
Thanks Albrecht, I was able to compile Dr. S first example code with
the command:
g++ -w -Wall -std=c++14 Graph.cpp Window.cpp GUI.cpp
Simple_window.cpp test.cpp `fltk-config --ldflags --use-images` -o test
Great, thanks for the feedback.
But when I'm using "fltk-config" like below it doesn't work.
fltk-config --ldflags --use-images --compile Graph.cpp
Window.cpp GUI.cpp Simple_window.cpp test.cpp -o test
Probably I should change something but I can't see it.
I could use only the g++ command, but it would be nice to understand how
to use "fltk-config" also.
You can use fltk-config either to output some flags, for instance with
$ fltk-config --use-images --cxxflags
which outputs the compiler flags you need to compile a program with fltk
and fltk_images *or* you can use it to compile a *single* C++ source
file but you can't combine both in one command.
Options like '--use-images' are used to modify the output of the related
command, i.e. (in this case) add the fltk_images libs and corresponding
compiler flags.
Basically this means: if you want to compile more than one file you'd
better use a script or a Makefile or write a CMake project file
(CMakeLists.txt) and use that to build and compile your app.
Just in case you don't know: the backticks (`...`) in your command above
(`fltk-config --ldflags --use-images`) mean: run the given command in a
shell and insert the output of this command at this place in the command
line.
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