[ptxdist] determining compiler/libc/target capabilities for monit

[Alexander Dahl <post@lespocky.de>]

Hei hei, 

I'm working on a package for monit [1]. While building fine in a usual
environment things are a little different with cross-compiling it with
ptxdist. I'm using ptxdist 2014.01.0 and OSELAS Toolchain 2012.12.1
building for armv5te. In the prepare stage aka when ./configure is
called for this autotool using project I get:

checking sys/filio.h presence... configure: error: cross-compiling:
please set 'libmonit_cv_setjmp_available=yes|no'
no
checking for sys/filio.h... no
checking setjmp is available... configure: error: ./configure failed for
libmonit

By setting those variable (and another) I could successfully make the
prepare stage run. This was introduced by monit in release 5.4 to
support cross compilation [2] and it circumvents the test program
compiled in ./configure call using AC_LANG_PROGRAM.

I'm not happy with this. The change seems like a workaround because
obviously you can not execute those small programms on the target in
this stage. Would it be possible to automatically get this information
instead of the developer having to set it? It took me quite a while to
verify which settings are correct for my toolchain/libc/target
combination and I do not want to release a package where a developer
would have to set those options.

So anyone having experience with autotools and cross-compiling, who can
suggest a technical solution? If yes I would try to get this change
upstream then.

Greets
Alex

[1] http://mmonit.com/monit/
[2] http://osdir.com/ml/monit-general/2012-05/msg00009.html

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