[Intel-gfx] [PATCH v3 1/5] drm: Add config for detecting libdrm

[Dmitry V. Levin]

On Thu, Jul 23, 2015 at 05:48:21AM -0400, Mike Frysinger wrote:
> On 01 Jul 2015 14:52, Patrik Jakobsson wrote:
> > Use pkg-config to try to find libdrm. If that fails use the standard
> > include directory for kernel drm headers in /usr/include/drm.
> > 
> > * configure.ac: Use pkg-config to find libdrm
> > 
> > Signed-off-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> > ---
> >  configure.ac | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/configure.ac b/configure.ac
> > index bb8bf46..aa63af7 100644
> > --- a/configure.ac
> > +++ b/configure.ac
> > @@ -844,6 +844,10 @@ fi
> >  AM_CONDITIONAL([USE_LIBUNWIND], [test "x$use_libunwind" = xyes])
> >  AC_MSG_RESULT([$use_libunwind])
> >  
> > +PKG_CHECK_MODULES([libdrm], [libdrm],
> > +	[CPPFLAGS="$CPPFLAGS $libdrm_CFLAGS"],
> > +	[CPPFLAGS="$CPPFLAGS -I/usr/include/drm"])
> 
> yikes, no, this is a really really bad idea.  it should read:
> PKG_CHECK_MODULES([LIBDRM], [libdrm],
> 	[CPPFLAGS="$CPPFLAGS $LIBDRM_CFLAGS"], [:])

Why [:] ?  Wouldn't [] suffice?


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