Huh. We're not generating the atomics assembly directly ourselves? On Wednesday, July 16, 2014, Johan Tibell <johan.tib...@gmail.com> wrote:
> I added some primops about a month ago > (4ee4ab01c1d97845aecb7707ad2f9a80933e7a49) that call __sync_fetch_and_add, > a gcc/llvm builtin. I'm a bit surprised to see this error. The GCC manual > [1] says: > > > " Not all operations are supported by all target processors. If a > particular operation cannot be implemented on the target processor, a > warning will be generated and a call an external function will be > generated. The external function will carry the same name as the builtin, > with an additional suffix `_n' where n is the size of the data type." > > I'm a bit surprised by this error for two reasons: > > * A call to that symbol should only be generated if the CPU doesn't > support the atomic instructions. What CPU model does Windows report that > you have? > > * gcc should define such a symbol. For me the following test program > compiles: > > #include <stdint.h> > > uint8_t test(uint8_t* ptr, uint8_t val) { > return __sync_fetch_and_add_1(ptr, val); > } > > int main(void) { > uint8_t n; > return test(&n, 1); > } > > Does that compile for you? Which version of GCC do we end up using on > Windows? > > The reported symbol (___sync_fetch_and_add_1) has three leading > underscores, that looks weird. Can you compile just > libraries/ghc-prim/cbits/atomic.c and see if it's indeed GCC that generates > a reference to that symbol? > > 1. http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html > > > On Wed, Jul 16, 2014 at 12:29 AM, Simon Peyton Jones < > simo...@microsoft.com > <javascript:_e(%7B%7D,'cvml','simo...@microsoft.com');>> wrote: > >> Aargh! The Windows build has broken – again. I can’t build GHC on my >> laptop any more. >> >> A clean ‘sh validate’ finishes as below. What on earth is >> `___sync_fetch_and_add_1'? >> >> Can anyone help? Thanks! >> >> Simon >> >> "inplace/bin/ghc-stage2.exe" -hisuf hi -osuf o -hcsuf hc -static -H32m >> -O -Werror -Wall -H64m -O0 -package-name vector-0.10.9.1 >> -hide-all-packages -i -ilibraries/vector/. >> -ilibraries/vector/dist-install/build >> -ilibraries/vector/dist-install/build/autogen >> -Ilibraries/vector/dist-install/build >> -Ilibraries/vector/dist-install/build/autogen -Ilibraries/vector/include >> -Ilibraries/vector/internal -optP-DVECTOR_BOUNDS_CHECKS -optP-include >> -optPlibraries/vector/dist-install/build/autogen/cabal_macros.h -package >> base-4.7.1.0 -package deepseq-1.3.0.2 -package ghc-prim-0.3.1.0 -package >> primitive-0.5.2.1 -O2 -XHaskell98 -XCPP -XDeriveDataTypeable -O2 -O >> -dcore-lint -fno-warn-deprecated-flags -no-user-package-db -rtsopts >> -Wwarn -odir libraries/vector/dist-install/build -hidir >> libraries/vector/dist-install/build -stubdir >> libraries/vector/dist-install/build -c >> libraries/vector/./Data/Vector/Fusion/Stream/Monadic.hs -o >> libraries/vector/dist-install/build/Data/Vector/Fusion/Stream/Monadic.o >> >> Loading package ghc-prim ... linking ... ghc-stage2.exe: unable to load >> package `ghc-prim' >> >> ghc-stage2.exe: >> C:\code\HEAD\libraries\ghc-prim\dist-install\build\HSghc-prim-0.3.1.0.o: >> unknown symbol `___sync_fetch_and_add_1' >> >> libraries/vector/ghc.mk:5: recipe for target >> 'libraries/vector/dist-install/build/Data/Vector/Fusion/Stream/Monadic.o' >> failed >> >> make[1]: *** >> [libraries/vector/dist-install/build/Data/Vector/Fusion/Stream/Monadic.o] >> Error 1 >> >> >> >> I >> >> _______________________________________________ >> ghc-devs mailing list >> ghc-devs@haskell.org >> <javascript:_e(%7B%7D,'cvml','ghc-devs@haskell.org');> >> http://www.haskell.org/mailman/listinfo/ghc-devs >> >> >
_______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs