Autotools can require tests that must execute on the target hardware.
Since this is not possible in general when cross compiling, site information is
used to provide cached test results so these tests can be skipped over but
still make the correct values available.
The meta/site directory
contains test results sorted into different categories such as architecture, endianness, and
the libc
used.
Site information provides a list of files containing data relevant to
the current build in the
CONFIG_SITE
variable
that Autotools automatically picks up.
The class also provides variables like
SITEINFO_ENDIANNESS
and SITEINFO_BITS
that can be used elsewhere in the metadata.
Because this class is included from base.bbclass
, it is always active.