we've already seen:
-[DILR]*|-Wl,-R*|-Wl,-*,/*
These are all only useful the first time we see them. All other
instances are redundant.
-l*
Extra libraries are suppressed if they're repeated, e.g.,
"-lm -lm -lm -lX11 -lX11 -lm -lm" -> "-lm -lX11 -lm".
The screen output is still likely to be very verbose, but you can check
in work/.work.log to see the actual commands executed.
do it for rpath specifications, e.g. -Wl,-R/dir, -Wl,-rpath,/dir, etc.
This lets the depot directory for a package, in addition to the usual
/usr/pkg/lib, to be added to the rpath of a program or shared library
of an "overwrite" package. Now, if the package instance in the
default view is forcibly removed, then shared library references will
still resolve to the existing shared libraries in the depot directory.
In the following example, I've built jpeg as a pkgviews package, and
tiff as an "overwrite" package:
% ldd /usr/pkg/lib/libtiff.so
/usr/pkg/lib/libtiff.so:
-ljpeg.62 => /usr/pkg/lib/libjpeg.so.62
-lz.0 => /usr/lib/libz.so.0
-lm.0 => /usr/lib/libm387.so.0
-lm.0 => /usr/lib/libm.so.0
% pkg_delete -f jpeg-6b
pkg_delete: package `jpeg-6b' is required by other packages:
tiff-3.5.7nb1
% ldd /usr/pkg/lib/libtiff.so
/usr/pkg/lib/libtiff.so:
-ljpeg.62 => /usr/pkg/packages/jpeg-6b/lib/libjpeg.so.62
-lz.0 => /usr/lib/libz.so.0
-lm.0 => /usr/lib/libm387.so.0
-lm.0 => /usr/lib/libm.so.0
The benefit here is that if the jpeg package is updated and also has
a bump in the major number of the shared lib, e.g. libjpeg.so.63.0,
then you can remove the old jpeg instance from the default view and
add the new jpeg package into the default view, and
/usr/pkg/lib/libtiff.so will _still_ resolve its libjpeg.so.62
reference.
Welcome to the power of Package Views!
automatically added to CFLAGS and CXXFLAGS. Note that -D... and -I...
settings should go into BUILDLINK_CPPFLAGS.<pkg> instead. BUILDLINK_CFLAGS
is reserved for stuff like "-pthread" or other compiler-specific flags.
Also note why we add BUILDLINK_CPPFLAGS.<pkg> to both CFLAGS and CXXFLAGS
(because a lot of software just uses CFLAGS and ignores any CPPFLAGS value
that we pass to it).
