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> 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 > http://www.haskell.org/mailman/listinfo/ghc-devs > >
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