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Subject: [Bug ada/55243] STAMP variable is not defined in t-avr
Date: Sun, 02 Dec 2012 23:17:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55243

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gjl at gcc dot gnu.org

--- Comment #7 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-12-02 23:17:19 UTC ---
(In reply to comment #6)
> The GNAT tools are for the host, they have nothing to do with multilibs.  How
> come the s-avr-mlib Makefile rule gets invoked here?

avr-gcc supports around 200 devices.  In order to keep the various parts of the
compiler in sync, some files are auto-generated from the device description in
$(srcdir)/config/avr/avr-mcus.def.

$(srcdir)/config/avr/t-avr reads:

...

AVR_MCUS = $(srcdir)/config/avr/avr-mcus.def

...

# MULTILIB_OPTIONS
# MULTILIB_DIRNAMES
# MULTILIB_EXCEPTIONS
# MULTILIB_MATCHES
$(srcdir)/config/avr/t-multilib: s-avr-mlib; @true

s-mlib: $(srcdir)/config/avr/t-multilib

s-avr-mlib: $(srcdir)/config/avr/genmultilib.awk $(AVR_MCUS)
    $(AWK) -f $< -v FORMAT=Makefile   $< $(AVR_MCUS) > tmp-avr-mlib
    $(SHELL) $(srcdir)/../move-if-change \
        tmp-avr-mlib     $(srcdir)/config/avr/t-multilib
    $(STAMP) $@


And in config.gcc there is 

tmake_file="avr/t-avr avr/t-multilib"


Thus, the assumption is that AWK, SHELL and STAMP are set correctly and
respective tools are available on the build platform.