Re: Converting a simple makefile in a GPS project.

[Stephen Leake <stephen_leake@stephe-leake.org>]

"Rego, P." <pvrego@gmail.com> writes:

> I'm getting a bit difficult in converting this makefile in a .gpr project file.
>
> -- makefile
> all: main.hex main.lss sizedummy
>  
> program:
> 	avrdude -pm8 <PROGRAMMER SPECIFIC> -Uflash:w:"main.hex"

You can't teach gprbuild to do this, since it has no result file
(although I could be wrong).

> main.elf: force
> 	avr-gnatmake main -o $@ -Os -mmcu=avr4 --RTS=zfp -largs crtm8._o
> 	-nostdlib -lgcc -mavr4 -Tdata=0x00800200

Apparently you are using '.elf' as the 'executable extension'. That is
specified in 'package Builder', via 'Executable_Suffix' (see
gprbuild_ug.info, section 6.3 Package Builder).

The other options go in 'package Compiler' or 'package Linker'. It is
difficult to tell which; things following -largs probably go in Linker,
but you may have to experiment. The manual is no help here; I have
complained about this to AdaCore, to no avail.

> main.lss: main.elf
> 	-avr-objdump -h -S main.elf  >"main.lss"

This just dumps the section headers into the .lss file. You might be
able to build a gprconfig file to teach gpr about this.
(gprbuild_ug.info section 5).

> main.hex: main.elf
> 	avr-objcopy -O ihex $< $@

Similarly, this converts a file from one format to another; you can
probably build a gprconfig file to do this.

> sizedummy: main.elf
> 	-avr-size --format=avr --mcu=atmega8 main.elf

I don't know what this does; possibly print a message to the output
stream giving the size? I don't think you can get gprbuild to do this.

> clean:
> 	$(RM) *.o leds  *.ihex *.ali *.elf *.hex *.lss *.map

no way.

gprbuild is _not_ a complete replacement for make.

For the makefile you show (assuming it is complete), there is no
advantage to using a gpr file.

A gpr file is useful when you have several source directories, when you
need to specify different compilation options for different files, or
when you have a high-level project composed of lower-level projects.

-- 
-- Stephe