configure: Move target source selection into configure.host

This eliminates the AM_CONDITIONAL ugliness, which eliminates
just a bit of extra boilerplate for a new target.

At the same time, properly categorize the EXTRA_DIST files
into SOURCES and HEADERS, for the generation of ctags.

configure.host

@@ -4,49 +4,60 @@
 #
 
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
+# Most of the time we can define all the variables all at once...
 case "${host}" in
   aarch64*-*-*)
 	TARGET=AARCH64; TARGETDIR=aarch64
+	SOURCES="ffi.c sysv.S"
 	;;
 
   alpha*-*-*)
 	TARGET=ALPHA; TARGETDIR=alpha;
 	# Support 128-bit long double, changeable via command-line switch.
 	HAVE_LONG_DOUBLE='defined(__LONG_DOUBLE_128__)'
+	SOURCES="ffi.c osf.S"
 	;;
 
   arc*-*-*)
 	TARGET=ARC; TARGETDIR=arc
+	SOURCES="ffi.c arcompact.S"
 	;;
 
   arm*-*-*)
 	TARGET=ARM; TARGETDIR=arm
+	SOURCES="ffi.c sysv.S"
 	;;
 
   avr32*-*-*)
 	TARGET=AVR32; TARGETDIR=avr32
+	SOURCES="ffi.c sysv.S"
 	;;
 
   bfin*)
 	TARGET=BFIN; TARGETDIR=bfin
+	SOURCES="ffi.c sysv.S"
 	;;
 
   cris-*-*)
 	TARGET=LIBFFI_CRIS; TARGETDIR=cris
+	SOURCES="ffi.c sysv.S"
 	;;
 
   frv-*-*)
 	TARGET=FRV; TARGETDIR=frv
+	SOURCES="ffi.c eabi.S"
 	;;
 
   hppa*-*-linux* | parisc*-*-linux* | hppa*-*-openbsd*)
 	TARGET=PA_LINUX; TARGETDIR=pa
+	SOURCES="ffi.c linux.S"
 	;;
   hppa*64-*-hpux*)
 	TARGET=PA64_HPUX; TARGETDIR=pa
 	;;
   hppa*-*-hpux*)
 	TARGET=PA_HPUX; TARGETDIR=pa
+	SOURCES="ffi.c hpux32.S"
 	;;
 
   i?86-*-freebsd* | i?86-*-openbsd*)
@@ -94,30 +105,37 @@ case "${host}" in
 
   ia64*-*-*)
 	TARGET=IA64; TARGETDIR=ia64
+	SOURCES="ffi.c unix.S"
 	;;
 
   m32r*-*-*)
 	TARGET=M32R; TARGETDIR=m32r
+	SOURCES="ffi.c sysv.S"
 	;;
 
   m68k-*-*)
 	TARGET=M68K; TARGETDIR=m68k
+	SOURCES="ffi.c sysv.S"
 	;;
 
   m88k-*-*)
 	TARGET=M88K; TARGETDIR=m88k
+	SOURCES="ffi.c obsd.S"
 	;;
 
   microblaze*-*-*)
 	TARGET=MICROBLAZE; TARGETDIR=microblaze
+	SOURCES="ffi.c sysv.S"
 	;;
 
   moxie-*-*)
 	TARGET=MOXIE; TARGETDIR=moxie
+	SOURCES="ffi.c eabi.S"
 	;;
 
   metag-*-*)
 	TARGET=METAG; TARGETDIR=metag
+	SOURCES="ffi.c sysv.S"
 	;;
 
   mips-sgi-irix5.* | mips-sgi-irix6.* | mips*-*-rtems*)
@@ -131,10 +149,12 @@ case "${host}" in
 
   nios2*-linux*)
 	TARGET=NIOS2; TARGETDIR=nios2
+	SOURCES="ffi.c sysv.S"
 	;;
 
   or1k*-linux*)
 	TARGET=OR1K; TARGETDIR=or1k
+	SOURCES="ffi.c sysv.S"
 	;;
 
   powerpc*-*-linux* | powerpc-*-sysv*)
@@ -166,28 +186,72 @@ case "${host}" in
 
   s390-*-* | s390x-*-*)
 	TARGET=S390; TARGETDIR=s390
+	SOURCES="ffi.c sysv.S"
 	;;
 
   sh-*-* | sh[[34]]*-*-*)
 	TARGET=SH; TARGETDIR=sh
+	SOURCES="ffi.c sysv.S"
 	;;
   sh64-*-* | sh5*-*-*)
 	TARGET=SH64; TARGETDIR=sh64
+	SOURCES="ffi.c sysv.S"
 	;;
 
   sparc*-*-*)
 	TARGET=SPARC; TARGETDIR=sparc
+	SOURCES="ffi.c ffi64.c v8.S v9.S"
 	;;
 
   tile*-*)
         TARGET=TILE; TARGETDIR=tile
+	SOURCES="ffi.c tile.S"
         ;;
 
   vax-*-*)
 	TARGET=VAX; TARGETDIR=vax
+	SOURCES="ffi.c elfbsd.S"
 	;;
 
   xtensa*-*)
 	TARGET=XTENSA; TARGETDIR=xtensa
+	SOURCES="ffi.c sysv.S"
 	;;
 esac
+
+# ... but some of the cases above share configury.
+case "${TARGET}" in
+  MIPS)
+	SOURCES="ffi.c o32.S n32.S"
+	;;
+  POWERPC)
+	SOURCES="ffi.c ffi_sysv.c ffi_linux64.c sysv.S ppc_closure.S"
+	SOURCES="${SOURCES} linux64.S linux64_closure.S"
+	;;
+  POWERPC_AIX)
+	SOURCES="ffi_darwin.c aix.S aix_closure.S"
+	;;
+  POWERPC_DARWIN)
+	SOURCES="ffi_darwin.c darwin.S darwin_closure.S"
+	;;
+  POWERPC_FREEBSD)
+	SOURCES="ffi.c ffi_sysv.c sysv.S ppc_closure.S"
+	;;
+  X86 | X86_FREEBSD | X86_WIN32)
+	SOURCES="ffi.c sysv.S"
+	;;
+  X86_64)
+	SOURCES="ffi64.c unix64.S"
+	;;
+  X86_WIN64)
+	SOURCES="ffiw64.c win64.S"
+	;;
+  X86_DARWIN)
+	SOURCES="ffi.c darwin.S ffi64.c darwin64.S"
+	;;
+esac
+
+# If we failed to configure SOURCES, we can't do anything.
+if test -z "${SOURCES}"; then
+  UNSUPPORTED=1
+fi