On Sunday, 20 May 2012 at 13:53:21 UTC, Mike Wey wrote:
On my system it looks like the order of the commands passed on
to ld differ depending on if -Xlinker is used.
gcc passes some default paths to the linker like: -L/lib/ and
-L/usr/lib/, now commands passed on to the linker with -Xlinker
are added after these paths, while if you don't use -Xlinker
the path is passed before the default paths.
So if your global phobos lib is installed in /lib or /usr/lib
it will be picked up by the linker if it searches those
directories before the one that contains the local one. The
search order for ld depends on the order in which they appear
on the commandline.
Thanks, that makes sense.
I found in dmd's link.c that special treatment is given to "-l"
by eliding -Xlinker. If I expand this logic to include -L it
takes care of my issue. I think it's the right thing given the
interaction between gcc and the linker-- it's not unlikely that D
libraries could appear in the default gcc library path and we
want paths supplied explicitly to dmd to take precedence. I'll
submit a patch.
If I can get that accepted I'll try to follow up and have
update.sh make a coherent dmd.conf.
