Cross-compiling and configure.ac macros

[Andreas Vinsander]

Hi,

I am trying to cross-compile jemalloc for evaluation on an embedded
device running a Linux home brew distro.

I have some problems with the way jemalloc tests for various support
of the host (target) system.

So far I have modified jemalloc-2.2.1 configure.ac as seen in the
attached patch, but there still exists a call to AC_RUN_IFELSE.

What is the best way to handle it? To use autoconf cache and supply a
default value when cross-compiling?

BR,
/Andreas Vinsander
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