Compiling for AVR targets with autoconf 2.64 broken in 9.10 (Karmic).

[Matt Jadud]

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This problem exists on fully up-to-date versions of 9.10. There do not
seem to be any bugs reported on this issue in Launchpad (searching for
combinations of "autoconf", "2.64", "2.65", "9.10").

autoconf 2.64 introduced a change to the AC_PROG_CC macro that breaks
compiling for the AVR (the processor used in the popular Arduino
project). The macro attempted to compile a small program that uses
"fopen", which is not included in avr-libc. While this is not
standards compliant, it makes sense: most AVR microcontrollers have
between 2K and 32K of flash.

The result of this macro change is that compiling for the AVR using
the autotools is broken in Ubuntu 9.10. Until this is fixed/updates,
projects that build code for the AVR cannot be built on Ubuntu 9.10.

The problem was reported against autoconf, and the discussion thread
can be found here:

http://thread.gmane.org/gmane.comp.sysutils.autoconf.bugs/6839

The patch against 2.64 that fixed the problem is here:

http://thread.gmane.org/gmane.comp.sysutils.autoconf.bugs/6839

The problem no longer exists/was fixed in autoconf 2.65. Or, if you
prefer, it is possible to compile code using the autotools for the AVR
series of microcontrollers using autoconf 2.65.

Many thanks,
Matt

 affects ubuntu/autoconf
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[Scott James Remnant (Canonical) (canonical-scott)]

2.65 is now in Lucid