On 17 November 2004 14:01, Christian Maeder wrote:

maeder@leo -> uname -a SunOS leo 5.8 Generic_117000-05 sun4u sparc SUNW,Sun-Fire-280R maeder@leo -> ghc --version The Glorious Glasgow Haskell Compilation System, version 6.2.1 maeder@leo -> gcc -v Reading specs from

/export/software/mirror/sparc-solaris/lang/bin/../lib/gcc/sparc-sun-sola ris2.8/3.4.3/specs

Configured with: ../gcc-3.4.3/configure --prefix=/usr/local/lang -program-suffix=_3.4.3 --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --enable-version-specific-runtime-libs --enable-languages=c,c++,f77 --enable-shared=libstdc++ --disable-nls Thread model: posix gcc version 3.4.3 maeder@leo -> ghc --make Main.hs -O Chasing modules from: Main.hs Compiling Main ( Main.hs, Main.o ) /tmp/ghc14393.hc: In function `__stginit_Main': /tmp/ghc14393.hc:5: note: if this code is reached, the program will abort /tmp/ghc14393.hc: In function `__stginit_ZCMain': /tmp/ghc14393.hc:12: note: if this code is reached, the program will abort /tmp/ghc14393.hc: In function `Main_a_entry': /tmp/ghc14393.hc:33: note: if this code is reached, the program will abort /tmp/ghc14393.hc: In function `Main_main_slow': /tmp/ghc14393.hc:49: note: if this code is reached, the program will abort /tmp/ghc14393.hc: In function `Main_main_entry': /tmp/ghc14393.hc:64: note: if this code is reached, the program will abort /tmp/ghc14393.hc: In function `ZCMain_main_slow': /tmp/ghc14393.hc:79: note: if this code is reached, the program will abort Linking ... maeder@leo -> ./a.out Illegal Instruction

Ah yes, I remember this. I think it was my bug report which caused the gcc folks to implement that warning message :-) GCC 3.4 is being terribly helpful by taking a rather extreme interpretation of the term "undefined behaviour" in the C99 spec to mean "abort". Unfortunately it looks like I haven't patched GHC to work around it. I patched my tree on the sourceforge Sparc machine I was using, but I can't access that right now (perhaps my account expired). IIRC, it was a simple change to the type cast in the definition of the JMP_ macro in ghc/includes/TailCall.h. Maybe change StgFunPtr to StgFun? You'll know when you get it right, because the warning will go away. Cheers, Simon