Re: bash cross with installed readline

[Mike Frysinger]

On Sun 16 Mar 2014 13:30:55 Andrew Kosteltsev wrote:
> When we build bash for some targets the INCLUDES variable for BUILD_CC
> contains the path to target readline headers. This path points to the
> target headers which not preferred for utilities which prepared for build
> machine.
> 
> Also when we have installed readline on the target the configure script
> avoids cross_compilation problems with AC_TRY_RUN and substitutes wrong
> (very old) version of libreadline. If we sure that we installed correct
> readline version we can change configure script for cross compilation
> process.
> 
> Please look at attached patches. If this solution can be used for common
> case then please apply these patches for the future versions of bash.

i haven't seen the issues you describe for the first patch.  maybe it's 
because i don't pass full paths to the target readline but instead let the 
toolchain find it for me.  so there is never any -I flag mixing.

the 2nd patch is the wrong way to approach the problem.  change the AC_TRY_RUN 
into an AC_TRY_COMPILE test by relying on RL_VERSION_{MAJOR,MINOR} being 
defined and doing an incremental search for its value.  see how autoconf 
implements its AC_CHECK_SIZEOF macro using only compile tests for the 
algorithm.
-mike

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