I forgot to mention in my first mail that I also got nearly 4000 warnings of the form, "call-clobbered register used for global register variable". They all occur in ghc/include/Reg.h, on the lines that declare the registers F1, F2, F3, F4, D1 and D2. However, in ghc/include/MachReg.h, we see: #if sparc_TARGET_ARCH ... #define CALLER_SAVES_F1 #define CALLER_SAVES_F2 #define CALLER_SAVES_F3 #define CALLER_SAVES_F4 #define CALLER_SAVES_D1 #define CALLER_SAVES_D2 So I am assuming that this warning may safely be ignored - is this correct? Btw, apologies that my original message was in MIME format. Sadly Outlook sends it like that even if you select plain text as your message format, so I have resorted to composing my messages in vi and using the unix mail command...