Please treat all of the below as unconfirmed because I have just too
many deviations from any book. This has been discovered while trying to
speed up Perl ./configure.gnu stage for x86_64-64 cross-lfs in qemu by
pre-seeding config.sh with various no-brainer checks.
In short, it looks like Chapter 5 Perl creates the UU/findhdr file with
the following contents in the beginning:
#!/bin/sh
wanted=$1
name=''
for usrincdir in /usr/include
do
if test -f $usrincdir/$wanted; then
echo "$usrincdir/$wanted"
exit 0
fi
done
and then follows the code that invokes the perprocessor to check whether
the $wanted header really doesn't exist. The problem is that any header
in /usr/include but not in /tools/include will be found as existing by
Perl Configure script, thus leaking unwanted influence from the host to
Chapter 5 Perl. While nobody reported a failed compilation because of
that, it is still bad.
Proposal: If all of the above gets verified, add the equivalent of the
following sed to the perl -libc patch:
sed -i 's,in \$usrinc,in /tools/include,' Configure
--
Alexander E. Patrakov
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