[cl-sdl-help] %SAP-ALIEN

[Lars B. <la...@no...>]

Using SBCL 0.8.16 on a PowerPC, I'm getting the classical error
message below.  I understand there's a solution to this involving
type declarations, but I don't know where to put them.  Should I
hack the internals of CL-SDL?

This small program is sufficient to get the message:
  (progn
    (sdl:init sdl:+init-video+)
    (cl-sdl:clear-screen (sdl:set-video-mode 512 512 32 sdl:+hwsurface+))
    (sdl:quit))

; in: LAMBDA NIL
;     (SB-ALIEN-INTERNALS:NATURALIZE
;    (SB-SYS:SAP+ SB-ALIEN::SAP (/ SB-ALIEN::OFFSET SB-VM:N-BYTE-BITS
;    '#<SB-ALIEN-INTERNALS:ALIEN-RECORD-TYPE (STRUCT SDL:SURFACE ...))))
; ==>
;   (SB-ALIEN-INTERNALS:%SAP-ALIEN
;    ALIEN '#<SB-ALIEN-INTERNALS:ALIEN-RECORD-TYPE (STRUCT SDL:SURFACE ...))
; note: unable to
;   optimize
; because:
;   could not optimize away %SAP-ALIEN: forced to do runtime
; allocation of alien-value structure

-- 
Lars Brinkhoff,         Services for Unix, Linux, GCC, HTTP
Brinkhoff Consulting    http://www.brinkhoff.se/