$ ls
static-fire.asd		static-fire.lisp

$ cat static-fire.asd
;; modeled after https://github.com/fare/workout-timer/blob/master/workout-timer.asd

(asdf:defsystem "static-fire"
  :depends-on ((:version "asdf" "3.1")
               "cffi")
  :serial t
  :components ((:file "static-fire")))

(asdf:defsystem "static-fire/static"
  :class program-system
  :defsystem-depends-on ("cffi-toolchain")
  :depends-on ("static-fire")
  :build-operation :static-program-op
  :build-pathname "static-fire.static"
  :entry-point "static-fire:entry-point")

$ cat static-fire.lisp
(defpackage #:static-fire
  (:use #:cl)
  (:export #:entry-point))

(defun entry-point (argv)
  (declare (ignore argv))
  (write-string "Hello, world!"))


=======================================

$ sbcl

* (asdf:load-system "static-fire")

; compiling file "/Users/robert/Scratch/static-fire/static-fire.lisp" (written 14 DEC 2017 11:46:54 AM):
; compiling (DEFPACKAGE #:STATIC-FIRE ...)
; compiling (DEFUN ENTRY-POINT ...)

; /Users/robert/.cache/common-lisp/sbcl-1.4.1.26-271f54e5c-macosx-x64/Users/robert/Scratch/static-fire/static-fire-tmpGHU3ALSV.fasl written
; compilation finished in 0:00:00.003
T
* (asdf:make "static-fire/static")
; cc -o /Users/robert/.cache/common-lisp/sbcl-1.4.1.26-271f54e5c-macosx-x64/Users/robert/Scratch/static-fire/static-fire/static-runtime-tmpAAURSO1 -g -mmacosx-version-min=10.6 -Wl,-no_pie -arch x86_64 -dynamic -twolevel_namespace -bind_at_load -pagezero_size 0x100000
Undefined symbols for architecture x86_64:
  "_main", referenced from:
      start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

debugger invoked on a UIOP/RUN-PROGRAM:SUBPROCESS-ERROR in thread
#<THREAD "main thread" RUNNING {1001B50083}>:
  Subprocess #<UIOP/LAUNCH-PROGRAM::PROCESS-INFO {10030745D3}>
 with command ("cc" "-o"
               "/Users/robert/.cache/common-lisp/sbcl-1.4.1.26-271f54e5c-macosx-x64/Users/robert/Scratch/static-fire/static-fire/static-runtime-tmpAAURSO1"
               "-g" "-mmacosx-version-min=10.6" "-Wl,-no_pie" "-arch" "x86_64"
               "-dynamic" "-twolevel_namespace" "-bind_at_load"
               "-pagezero_size" ...)
 exited with error code 1

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [CONTINUE                     ] IGNORE-ERROR-STATUS
  1: [RETRY                        ] Retry
                                     #<STATIC-RUNTIME-OP > on #<PROGRAM-SYSTEM "static-fire/static">.
  2: [ACCEPT                       ] Continue, treating
                                     #<STATIC-RUNTIME-OP > on #<PROGRAM-SYSTEM "static-fire/static">
                                     as having been successful.
  3:                                 Retry ASDF operation.
  4: [CLEAR-CONFIGURATION-AND-RETRY] Retry ASDF operation after resetting the
                                     configuration.
  5:                                 Retry ASDF operation.
  6:                                 Retry ASDF operation after resetting the
                                     configuration.
  7: [ABORT                        ] Exit debugger, returning to top level.

(UIOP/RUN-PROGRAM::%CHECK-RESULT 1 :COMMAND ("cc" "-o" "/Users/robert/.cache/common-lisp/sbcl-1.4.1.26-271f54e5c-macosx-x64/Users/robert/Scratch/static-fire/static-fire/static-runtime-tmpAAURSO1" "-g" "-mmacosx-version-min=10.6" "-Wl,-no_pie" "-arch" "x86_64" "-dynamic" "-twolevel_namespace" "-bind_at_load" "-pagezero_size" ...) :PROCESS #<UIOP/LAUNCH-PROGRAM::PROCESS-INFO {10030745D3}> :IGNORE-ERROR-STATUS NIL)
   source: (CERROR "IGNORE-ERROR-STATUS" 'SUBPROCESS-ERROR :COMMAND COMMAND
                   :CODE EXIT-CODE :PROCESS PROCESS)
0]