Re: [avr-gcc-list] avr-gcc with Autotools

[Russell Shaw]

Marcelo Politzer wrote:
> Hi, I'm developing a lib with autotools for more than one avr MCU, and 
> got stuck with the folowing situation:
>
> I need to add a -mmcu corresponding to the correct mcu, and also add the 
> diferent folders according to that,
> currently I can make the configure recognize that Im building for AVR 
> when I do a `./configure --host avr', the
> ideal way for me would do it like `./configure --host avr --mcu atmega8' 
> but that gives me an error.
>
> In my makefile.am <http://makefile.am> im using a entry that depends on 
> that, like:
> pio_SOURCES=specific/$(ARCH)/$(MCU)/pio.c
>
> and it depends on that iformation.
>
> My question is: how can I add a -mmcu at configure level, is it 
> possible, or even worth it?

Those double-dash options are hard-wired in to autoconf option
parsing iirc. Maybe you could do: ./configure --host atmega8'

AC_PREREQ([2.65])
AC_INIT([Avrproj], [0.01], address@hidden, [avrproj])

AC_CONFIG_SRCDIR([src/main.c])
AC_CONFIG_HEADER([src/config.h])

AC_CANONICAL_HOST

case $host_cpu in
    atmega8*-*-* )
        CFLAGS="$CFLAGS ${EXTRA_CFLAGS}"
        CPPFLAGS="$CPPFLAGS ${EXTRA_CPPFLAGS}"
        root="root-wherever"
        arch="mega"
        mcu="atmega8"
        ;;

    atmega16*-*-* )
#       like above
        ;;

    * )
#       some default
        ;;
esac

AC_SUBST(ROOT, ["$root"])
AC_SUBST(ARCH, ["$arch"])
AC_SUBST(MCU, ["$mcu"])


Also, you could abuse the cpu-vendor-os triplet options and do:
./configure --host avrmega-atmega8'

case $host_cpu in
    avr-atmega8*-* )
        CFLAGS="$CFLAGS ${EXTRA_CFLAGS}"
        CPPFLAGS="$CPPFLAGS ${EXTRA_CPPFLAGS}"
        root="root-wherever"
        ;;

    avr-atmega16*-* )
        ...





AC_SUBST(ROOT, ["$root"])
AC_SUBST(ARCH, ["$host_cpu"])
AC_SUBST(MCU, ["$host_vendor"])

http://www.gnu.org/software/autoconf/manual/autoconf.html