Results, slightly reformatted, if not "f1 / main out" (collected in 2007)

Solaris 10 on Sun Blade 1500 with Sun's compiler (32- or 64-bit executable)
  cc -v -o h1.x h1.c
  cc -v -o h1.x -xarch=v9 h1.c
  cc -v -o h1.x -xarch=generic64 h1.c
  c99 -v -o h1.x h1.c
  c99 -v -o h1.x -xarch=v9 h1.c
  c99 -v -o h1.x -xarch=generic64 h1.c
  arg           result
  (none)        Segmentation fault

  Why did nothing interesting happen?
    func is stored in a register, not on the stack.

Solaris 10 on Sun Blade 1500 with GCC (32- or 64-bit executable)
  gcc -ansi -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -std=c99 -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -m64 -ansi -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -m64 -std=c99 -Wall -Wextra -pedantic -o h1.x h1.c
  arg           result
  (none)        Segmentation fault
  3             f2 / main out

Linux 2.6 on AMD Opteron with GCC (32- or 64-bit executable)
  gcc -ansi -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -std=c99 -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -m64 -ansi -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -m64 -std=c99 -Wall -Wextra -pedantic -o h1.x h1.c
  arg           result
  (none)        Segmentation fault
  3             f2 / main out
  7             f1 / main out / f2 / Segmentation fault

Mac OS X on Powerbook G4 with GCC
  gcc -ansi -Wall -Wextra -pedantic -o h1.x h1.c
  gcc -std=c99 -Wall -Wextra -pedantic -o h1.x h1.c
  arg           result
  (none)        Bus error
  -15           Bus error
  -1            f2 / main out
  11            f1 / main out / f2 [repeated forever]