C warnings:
http://www.algonet.se/~afb/d/dmd-0.118-cwarn.patch
> (pthread_mutexattr_settype is only available in
> the __UNIX98 version of the <pthread.h> header)

D warnings:
http://www.algonet.se/~afb/d/dmd-0.118-dwarn.patch

- downcasting of like "255" to return ubyte/ushort, etc
- "missing" default cases to certain switch statements
- "missing" code after infinite loops, added assert(0)
- casts from long to ulong (these might still lose data ?)
- returned values, after throwing Exception (unreachable)

One real bug:

- std.date called LeapYear with seconds instead of year?

Bogus booleans:
http://www.algonet.se/~afb/d/dmd-0.118-dbool.patch
> These should *not* cause warnings, and this patch
> should be removed when the compiler has been fixed.


With the patches, Phobos now passes with the settings:
CFLAGS="-Wall -Werror" CXXFLAGS="$CFLAGS" DFLAGS="-w"

http://www.algonet.se/~afb/d/dmd.spec
http://www.algonet.se/~afb/d/dmd-0.118-10.nosrc.rpm

--anders