Compile a C++ application

This tutorial explains how to compile the classic Hello World ! example using the standard Axis SDK environment using C++

Install the Axis SDK on your Linux box and go to the devboard-R_01 directory and type:

# . init_env
# cd apps

# mkdir helloworld
# cd helloworld

Edit this source code and save it with the name helloworld.cpp
WARNING!! File extention MUST BE "cpp".

@source='helloworld.cpp'

Edit this file and save it with the name Makefile:

@source='Makefile'

WARNING!! You MUST use TAB and don't use SPACE at the begin of follow rows:

$(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $@
$(INSTALL) -d $(INSTDIR)
$(INSTALL) -m $(INSTMODE) -o $(INSTOWNER) -g $(INSTGROUP) $(PROGS) $(INSTDIR)
rm -f $(PROGS) *.o core

Using SPACE, produce follow error when run make:

Makefile.xx:*** missing separator. Stop

Now let's to try our program in the host operating sistem, type:

# make host
make[1]: Entering directory `/home/devboard-R2_01/apps/helloworld'
make[1]: Leaving directory `/home/devboard-R2_01/apps/helloworld'

Then type:

# make
g++ -Wall -Wshadow -I/root/fox/devboard-R2_01/target/host/include -O0 -g
-fno-omit-frame-pointer -Wno-ctor-dtor-privacy -ansi -pipe -c -o helloworld.o helloworld.cpp
g++ -static -L/root/fox/devboard-R2_01/target/host/lib
-Wl,-rpath-link,/root/fox/devboard-R2_01/target/host/lib helloworld.o -o helloworld

And now run the program.

#./helloworld
Hello World!

Now select like target the Fox board. Type:

# make cris-axis-linux-gnu
make[1]: Entering directory `/root/fox/devboard-R2_01/apps/HelloWorld'
rm -f helloworld *.o core
cp "/root/fox/devboard-R2_01/apps/HelloWorld/.tmp.target-makefrag" .target-makefrag
make[1]: Leaving directory `/root/fox/devboard-R2_01/apps/HelloWorld'

Then make the executable. Type:

# make
g++-cris -isystem /root/fox/devboard-R2_01/target/cris-axis-linux-gnu/include -mlinux
-mno-mul-bug-workaround -Wall -Wshadow -O2 -g -Wno-ctor-dtor-privacy -ansi -pipe -c -o helloworld.o helloworld.cpp
g++-cris -isystem /root/fox/devboard-R2_01/target/cris-axis-linux-gnu/include -mlinux
-mno-mul-bug-workaround -static -L/root/fox/devboard-R2_01/target/cris-axis-linux-gnu/lib
-Wl,-rpath-link,/root/fox/devboard-R2_01/target/cris-axis-linux-gnu/lib helloworld.o -o helloworld

The excutable size after compiling is 5673064 byte, to verify it, type:

# ls -al hellowolrd
-rwxr-xr-x   1 root root 5673064 25 mag 09:47   helloworld

WARNING!!! The size is too bit to copy on the on board flash.
To run "helloworld"you MUST connect a Pen Drive to USB port, mount and copy helloworld on It.

Using telnet (@h1='53') run the program.

Reduce executable size to fit on the on board flash

It's possible to reduce executable size running follow command. Type:

# cris-strip --strip-unneeded helloworld

The reduced size is 556000 byte, and now we can copy helloworld to the on board Fox flash.

# ls -al hellowolrd
-rwxr-xr-x   1 root root 556000 25 mag 09:47   helloworld

Credits

Many thank to Pierluigi Bucolo for this article