Bug 6822 – New ubuntu linking rules prevent dmd from linking programs on Ubuntu 11.10

I recently upgraded to Ubuntu 11.10, and dmd complains during link that functions defined in -lrt are missing. using dmd -v, I get: gcc testbool.o -o testbool -m32 -Xlinker -L/home/steves/dmd-2.054/linux/bin32/../lib32 -Xlinker -L/home/steves/dmd-2.054/linux/bin32/../lib64 -Xlinker --no-warn-search-mismatch -Xlinker --export-dynamic -lrt -lphobos2 -lpthread -lm Note that -lrt comes before -lphobos2, where the functions are needed. I'm not sure how the compiler worked on ubuntu 11.04 (the previous release), but apparently there are stricter rules. I don't know how to fix this, you want to be able to link libs before and after phobos is specified on the command line, so we may need to either explicitly name phobos2 in the dmd.conf, or have two sets of DFLAGS. However, as of now, I cannot link anything without using -v and manually running the link step, adding -lrt to the end.

The right answer for this one probably is moving the -lrt part out of dmd.conf and into core/time.d as pragma(lib, "rt"), conditional on linux. I haven't tried it though.

That doesn't work. pragma(lib) only works if you are compiling all files at the same time. This fails to compile: void main() {} I didn't import std.datetime at all, so the compiler would never know that it had to link -lrt.

(In reply to comment #2) > I didn't import std.datetime at all or rather core.time...

https://github.com/D-Programming-Language/dmd/commit/1ff6ad8509cbfa73ae5519fa40898c5b005ab6ca You'll still need to remove -lrt from your dmd.conf

works, thanks. Note that it still works even if you leave -L-rt in dmd.conf, even though it's not necessary to have it there.