chapter6: Add --build for all cross compiled packages

[Xi Ruoyao]

In autoconf, --host=$LFS_TGT alone is not enough for cross compiling. We need the combination of --host=$LFS_TGT --build=$(./config.guess) (path to config.guess may vary for different packages).

With diffutils-3.10 (the first chapter 6 package without --build) the configure script says:

checking whether we are cross compiling... no

This is not what we want. And the issue is likely causing a build failure in chapter 6 sed with glibc-2.38 (not sure why it only starts to blow up with the glibc update though).

[Xi Ruoyao]

The chapter 6 packages lacking --build:

• diffutils
• findutils
• grep
• sed

[Xi Ruoyao]

I (and Thomas, and r1c0n3r0 from #lfs-support) can confirm with Glibc-2.38 sed FTBFS with:

help2man: can't get `--help' info from sed/sed
Try `--no-discard-stderr' if option outputs to stderr

because the building system does not know we are cross compiling, and attempts to run sed --help.

The reason it suddenly starts to blow up with Glibc-2.38: Glibc-2.38 redirects strtol to __isoc23_strtol if C2X or _GNU_SOURCE is enabled, and __isoc23_strtol did not exist in previous Glibc versions.

[Xi Ruoyao]

With --build=$(./config/build-aux) added sed builds and installs fine in chapter 6.

[Bruce Dubbs]

Fixed at commit be5b2e03fc6e7382f8c012d9fdb8e29a9bbbf17c

[Bruce Dubbs]

Milestone renamed