Serious (semi-)infinite loop

[Tim Van Holder]

Running automake on libffi as part of the gcc tree, yields
about a zillion occurrences of

automake: Makefile.am: warning: automake does not support libffi_la_SOURCES
being defined conditionally
  libffi_la_SOURCES (User, where = 111) =
  {
    ALPHA_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_ALPHA)
    ARM_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_ARM)
    IA64_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_IA64)
    M68K_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_M68K)
    MIPS_GCC_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_MIPS_GCC)
    MIPS_SGI_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_MIPS_SGI)
    POWERPC_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_POWERPC)
    SPARC_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_SPARC)
    X86_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_X86)
    X86_DJGPP_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_X86_DJGPP)
    X86_WIN32_TRUE => $(libffi_la_common_SOURCES) $(TARGET_SRC_X86_WIN32)
  }

interspersed with messages like

automake: Makefile.am: object `sysv.lo' created by `src/m68k/sysv.S' and
`src/x86/sysv.S'
automake: Makefile.am: object `ffi.lo' created by `src/sparc/ffi.c' and
`src/x86/ffi.c'
automake: Makefile.am: object `ffi.lo' created by `src/ia64/ffi.c' and
`src/x86/ffi.c'
automake: Makefile.am: object `ffi.lo' created by `src/mips/ffi.c' and
`src/x86/ffi.c'
automake: Makefile.am: object `ffi.lo' created by `src/m68k/ffi.c' and
`src/x86/ffi.c'
automake: Makefile.am: object `sysv.lo' created by `src/m68k/sysv.S' and
`src/x86/sysv.S'
automake: Makefile.am: object `ffi.lo' created by `src/sparc/ffi.c' and
`src/x86/ffi.c'
automake: Makefile.am: object `ffi.lo' created by `src/ia64/ffi.c' and
`src/x86/ffi.c'

(I stopped it after a few minutes (13MB output); I'm not sure how long
it would have taken to run to completion).

Either this should be a fatal error, or some other method should be used
to avoid such an amazing excess.
I've attached the Makefile.am in question for reference.

Makefile.am
Description: Binary data