Re: df is never built while cross-compiling for a linux target

[Ralf Wildenhues]

Hello Mike, all,

* Mike Frysinger writes:
> 
> the issue does go beyond this specific fs test as there are a bunch of common 
> vars that come from gnulib that do not get set properly in cross-compiling 
> (like the silly GNU malloc(0) / rpl_malloc test) ... perhaps start with 
> gnulib and have some common m4 file spit out a notice for people when they're 
> doing cross-compiling to visit some document for further info ... not sure 
> what sort of mechanism would exist though for automatically extracting and 
> documenting though ... i can dabble in m4, but it's certainly not a strong 
> point of mine

This idea has some appeal to it.  Not sure whether another optional argument
to AC_RUN_IFELSE for explanation would be the best.  But for a start you can
get a good idea of runtime issues using this command to show the cross-compile
settings of macros:
  autoconf '--trace=AC_TRY_RUN:$f:$l:$4' '--trace=AC_RUN_IFELSE:$f:$l:$4'

Hope that helps.  Please Cc: me on replies.

Cheers,
Ralf