#9010: TemplateHaskell leads to an "unknown symbol" error -------------------------------------+------------------------------------- Reporter: Feuerbach | Owner: Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by basvandijk): Regarding the symbol in question, note that according to http://demangler.com/ the mangled symbol `_ZGVZN2cv9v_invsqrtERKNS_11v_float32x4EE4_0_5` demangles to: {{{ guard variable for cv::v_invsqrt(cv::v_float32x4 const&)::_0_5 }}} It is defined here: https://github.com/Itseez/opencv/blob/3.0.0/modules/hal/include/opencv2/hal/... And it indeed occurs in `libopencv_hal.a`: {{{ nm /nix/store/1wyif1adq0pb9h08jqr0v5lrykfhdhah- opencv-3.0.0/lib/libopencv_hal.a 2>/dev/null | grep _ZGVZN2cv9v_invsqrtERKNS_11v_float32x4EE4_0_5 0000000000000000 u _ZGVZN2cv9v_invsqrtERKNS_11v_float32x4EE4_0_5 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9010#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler