/usr/local/include in _KDE4_PLATFORM_INCLUDES on FreeBSD?

[Alexander Neundorf]

On Tuesday 18 May 2010, Raphael Kubo da Costa wrote:
> On Tuesday 18 May 2010 18:05:37 Alexander Neundorf wrote:
> > On Saturday 15 May 2010, Raphael Kubo da Costa wrote:
> > > On Monday 10 May 2010 19:26:25 Raphael Kubo da Costa wrote:
> > > > On Monday 10 May 2010 19:13:49 Alexander Neundorf wrote:
> > > > > On Tuesday 11 May 2010, Raphael Kubo da Costa wrote:
> > > > > > On Monday 10 May 2010 18:54:31 Alexander Neundorf wrote:
> > > > > > > On Monday 10 May 2010, Raphael Kubo da Costa wrote:
> > > > > > > > Hey there,
> > > > > > > >
> > > > > > > > I was trying to update kdelibs today on FreeBSD and noticed
> > > > > > > > nepomuk kept failing to compile because some methods were not
> > > > > > > > found in Soprano.
> > > > > > > >
> > > > > > > > It turns out kdelibs/nepomuk/query/CMakeLists.txt's
> > > > > > > > include_directories() call put KDE4_KDECORE_INCLUDES before
> > > > > > > > SOPRANO_INCLUDE_DIR, so my system-wide Soprano headers (in
> > > > > > > > /usr/local/include) were being used instead of my trunk
> > > > > > > > Soprano headers in $HOME/kde4/include.
> > > > > > > >
> > > > > > > > Apparently, /usr/local/include was coming from
> > > > > > > > _KDE4_PLATFORM_INCLUDE_DIRS.
> > > > > > >
> > > > > > > This must be X11_INCLUDE_DIR. Can you confirm this ?
> > > > > >
> > > > > > According to what I saw on FindKDE4Internal.cmake yesterday, yes.
> > > > > > And yes, X11 is inside /usr/local.
> > > > >
> > > > > Hmm, we could remove X11_INCLUDE_DIR. One could argue whether this
> > > > > would be a bugfix or a potentially source incompatible change.
> > > > > But even then, couldn't this also happen with any other include
> > > > > dirs used in the "right" order ?
> > > >
> > > > Hmm, you mean if some other dependency was found in /usr/local and it
> > > > ended up being included via include_directories() before
> > > > $MYLOCALKDEPREFIX? Probably...
> > > >
> > > > I'm not sure if there's a proper "fix" for this. Why isn't /usr
> > > > included by CMake?
> > >
> > > Ping? :)
> >
> > Hmm, I think there may be no better solution than to manually take care
> > of a good order for the include directories...
> > I mean, removing X11_INCLUDE_DIR there would fix this one issue, but this
> > can happen for other packages too...
>
> Yep, that's why I was trying to understand why /usr isn't included by CMake
> via include_directories(). Maybe there could be a way for it to do the same
> with /usr/local, so that it's always used with a lower priority than the
> rest?

I guess this is because /usr/include is part of CMAKE_[C|
CXX]_IMPLICIT_INCLUDE_DIRECTORIES, which is set in 
cmake/Modules/Platform/UnixPaths.cmake.
Maybe the compiler/gcc could be queried instead so the list is built 
dynamically. This is done now already for the Eclipse generator, see 
cmake/Modules/CMakeFindEclipseCDT4.cmake

What do you think about this ?

Alex