ccache: add packageconfig docs option
Before, ccache's configure stage built HTML documentation and man pages
depending on if asciidoc is installed. This patch makes it configurable.
Pass the new cmake option ENABLE_DOCUMENTATION along and add the
asciidoc dependency if necessary.
This fixes an issue when ccache's configure stage found asciidoc/a2x on
the system outside of the sysroot (e.g. installed via 'apt install
asciidoc'). ccache would then decide to build docs and manual pages, but
would fail during compilation: the system's a2x could not find the
system's asciidoc because it did not reside in the set PATH.
By enabling/disabling docs/man page generation explicitly and adding
asciidoc to DEPENDS as necessary, this is no longer an issue.
[ This corresponds to commit
b0aedd74 and parts of commit
1eedc5f8,
with the patch replaced by the upstream version. ]
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
