Automoc issue with cmake

[Alexander Neundorf]

On Saturday 17 November 2012, Laszlo Papp wrote:
> > CMake says that it is processing the file
> > /lib64/automoc4/Automoc4Config.cmake
> > , not /usr/lib/automoc4/Automoc4Config.cmake (as pacman says).
> > Is there maybe something with symbolic links ?
> 
> Yes, so a quick workaround is getting a symlink from /bin/automoc4 to
> /usr/bin/automoc4.


Yes, I think this is ok.

> ls -lda /lib*
> lrwxrwxrwx 1 root root 7 Oct 24 22:37 /lib -> usr/lib
> lrwxrwxrwx 1 root root 7 Oct 24 22:37 /lib64 -> usr/lib


From Modules/UnixPaths.cmake:
list(APPEND CMAKE_SYSTEM_PREFIX_PATH
  # Standard
  /usr/local /usr /
   ...
   )

I'm not too sure how the 64bit dirs are handled, but I guess that first cmake 
looks in /usr/local/lib64/, then in /usr/lib64/, then /lib64/ (where it finds 
the Config.cmake file), then proceeds without the suffix "64", i.e. 
/usr/local/lib/, /usr/lib/ and /lib/.

It is somewhat strange /lib64/ is a symlink to /usr/lib/, but /bin/ is not 
such a symlink. Is there a reason for this ?

This will probably break for more Config.cmake files, not only automoc.

> I have just talked to the "automoc4" package maintainer for Archlinux in
> #archlinux-bugs as there is a Bug Squashing Day today. He has this output:
> 
> -- Automoc4Config: CURRENT_DIR: -/usr/lib/automoc4- current file:
> -/usr/lib/automoc4/Automoc4Config.cmake-
> -- Automoc4: bin dir: -/usr- exe: -/usr/bin/automoc4-
> 
> Hence, certain people can reproduce this on Archlinux, but certain cannot.
> The package maintainer has just written that to me, I am not the first one
> having this issue on Archlinux, but he and others cannot reproduce it,
> unfortunately.
> 
> Do you have any ideas why it cannot find the same for me?

Maybe the search order for the 64 bit dirs has been changed in 2.8.10, I don't 
know.

Alex