Split up toplevel library-disabling cases

["Joseph S. Myers" <joseph at codesourcery dot com>]

This patch, relative to a tree with
<http://gcc.gnu.org/ml/gcc-patches/2011-03/msg02027.html> (pending
review) applied, continues toplevel configure cleanup by splitting the
disabling of some libraries into separate case statements for those
libraries.  Separating the logic like this brings things closer to the
desired state of this configuration being in fragments in
subdirectories rather than hardcoded directly in the toplevel
configure script, as well as making it easier to clean up this logic
where the directory disabling is not in fact appropriate.

Specifically, this separates out code for target-libssp,
target-libiberty, target-libstdc++-v3 and Fortran, so covering all GCC
target-library or language disabling except that related to Java
(which is most in need of cleanup, but also the most complicated and
so best dealt with separately).

The logic for what is disabled where is kept unchanged - including the
peculiar logic for target-libiberty (sometimes skipdirs is set or
appended to, sometimes noconfigdirs) - where I think the right fix
will end up being removing target-libiberty support completely, but
don't plan to work on that.  The only changes to what would be
disabled where are: two cases, for ip2k-*-* and picochip-*-*, that
disable target-libiberty are moved completely to the separate case
statement (rather than leaving empty cases behind), so in the general
case statement those targets will now fall through to *-*-* and
disable libgcj, which is OK since ip2k-*-* has no GCC support at all
and picochip has no libffi port so can't actually build Java; in the
libstdc++-v3 case statement, the target pattern for disabling
libstdc++-v3 on WinCE was adjusted to match exactly GCC's supported
targets for CE.

OK to commit (both the previous patch this is based on, and this one)?

Target maintainers: I'd like to understand why it is necessary to
disable libssp for AVR, AIX and Microblaze, and libstdc++-v3 for AVR
(and what use C++ is on AVR without libstdc++-v3 - do you use another
C++ library?).  Note that changing libstdc++-v3/acinclude.m4 to build
only freestanding libraries for a target may be an alternative to
disabling libstdc++-v3 completely for that system.  If the libraries
don't need disabling, they shouldn't be disabled, to keep down the
amount of ad hoc tests for particular targets at toplevel.  If they do
need disabling, there should be comments to explain why.

2011-03-31  Joseph Myers  <joseph@codesourcery.com>

	* configure.ac: Separate cases disabling target-libssp,
	target-libiberty, target-libstdc++-v3 and Fortran from general
	case over targets.

--- configure.ac	2011-03-29 20:32:56.000000000 +0000
+++ configure.ac.new	2011-03-31 23:21:51.000000000 +0000
@@ -516,6 +516,87 @@
     esac
 fi
 
+# Disable libssp for some systems.
+case "${target}" in
+  avr-*-*)
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
+  powerpc-*-aix* | rs6000-*-aix*)
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
+  microblaze*)
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
+esac
+
+# Disable target libiberty for some systems.
+case "${target}" in
+  *-*-kaos*)
+    # Remove unsupported stuff on all kaOS configurations.
+    skipdirs="target-libiberty"
+    ;;
+  *-*-netbsd*)
+    # Skip some stuff on all NetBSD configurations.
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  *-*-netware*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  *-*-rtems*)
+    skipdirs="${skipdirs} target-libiberty"
+    ;;
+  *-*-tpf*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  *-*-vxworks*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  sh*-*-pe|mips*-*-pe|*arm-wince-pe)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  arm*-*-symbianelf*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  avr-*-*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  m68hc11-*-*|m6811-*-*|m68hc12-*-*|m6812-*-*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  picochip-*-*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+  mips*-sde-elf*)
+    skipdirs="$skipdirs target-libiberty"
+    ;;
+  ip2k-*-*)
+    noconfigdirs="$noconfigdirs target-libiberty"
+    ;;
+esac
+
+# Disable libstdc++-v3 for some systems.
+case "${target}" in
+  *-*-vxworks*)
+    # VxWorks uses the Dinkumware C++ library.
+    noconfigdirs="$noconfigdirs target-libstdc++-v3"
+    ;;
+  arm*-wince-pe*)
+    # the C++ libraries don't build on top of CE's C libraries
+    noconfigdirs="$noconfigdirs target-libstdc++-v3"
+    ;;
+  avr-*-*)
+    noconfigdirs="$noconfigdirs target-libstdc++-v3"
+    ;;
+esac
+
+# Disable Fortran for some systems.
+case "${target}" in
+  mmix-*-*)
+    # See <http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00572.html>.
+    unsupported_languages="$unsupported_languages fortran"
+    ;;
+esac
+
 # Default libgloss CPU subdirectory.
 libgloss_dir="$target_cpu"
 
@@ -562,12 +643,11 @@
     ;;
   *-*-kaos*)
     # Remove unsupported stuff on all kaOS configurations.
-    skipdirs="target-libiberty"
     noconfigdirs="$noconfigdirs target-libgloss"
     ;;
   *-*-netbsd*)
     # Skip some stuff on all NetBSD configurations.
-    noconfigdirs="$noconfigdirs target-newlib target-libiberty target-libgloss"
+    noconfigdirs="$noconfigdirs target-newlib target-libgloss"
 
     # Skip some stuff that's unsupported on some NetBSD configurations.
     case "${target}" in
@@ -579,21 +659,20 @@
     esac
     ;;
   *-*-netware*)
-    noconfigdirs="$noconfigdirs target-newlib target-libiberty target-libgloss ${libgcj}"
+    noconfigdirs="$noconfigdirs target-newlib target-libgloss ${libgcj}"
     ;;
   *-*-rtems*)
-    skipdirs="${skipdirs} target-libiberty"
     noconfigdirs="$noconfigdirs target-libgloss ${libgcj}"
     ;;
     # The tpf target doesn't support gdb yet.
   *-*-tpf*)
-    noconfigdirs="$noconfigdirs target-newlib target-libgloss target-libiberty ${libgcj} gdb tcl tk libgui itcl"
+    noconfigdirs="$noconfigdirs target-newlib target-libgloss ${libgcj} gdb tcl tk libgui itcl"
     ;;
   *-*-uclinux*)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss target-rda ${libgcj}"
     ;;
   *-*-vxworks*)
-    noconfigdirs="$noconfigdirs target-newlib target-libgloss target-libiberty target-libstdc++-v3 ${libgcj}"
+    noconfigdirs="$noconfigdirs target-newlib target-libgloss ${libgcj}"
     ;;
   alpha*-dec-osf*)
     # ld works, but does not support shared libraries.
@@ -620,10 +699,7 @@
     ;;    
   sh*-*-pe|mips*-*-pe|*arm-wince-pe)
     noconfigdirs="$noconfigdirs ${libgcj}"
-    noconfigdirs="$noconfigdirs target-libiberty"
     noconfigdirs="$noconfigdirs tcl tk itcl libgui sim"
-    # the C++ libraries don't build on top of CE's C libraries
-    noconfigdirs="$noconfigdirs target-libstdc++-v3"
     noconfigdirs="$noconfigdirs target-newlib"
     libgloss_dir=wince
     ;;
@@ -644,7 +720,7 @@
     libgloss_dir=arm
     ;;
   arm*-*-symbianelf*)
-    noconfigdirs="$noconfigdirs ${libgcj} target-libiberty"
+    noconfigdirs="$noconfigdirs ${libgcj}"
     libgloss_dir=arm
     ;;
   arm-*-pe*)
@@ -654,7 +730,7 @@
     noconfigdirs="$noconfigdirs ld target-libgloss"
     ;;
   avr-*-*)
-    noconfigdirs="$noconfigdirs target-libiberty target-libstdc++-v3 ${libgcj} target-libssp"
+    noconfigdirs="$noconfigdirs ${libgcj}"
     ;;
   bfin-*-*)
     unsupported_languages="$unsupported_languages java"
@@ -808,7 +884,6 @@
     noconfigdirs="$noconfigdirs ${libgcj}"
     ;;
   m68hc11-*-*|m6811-*-*|m68hc12-*-*|m6812-*-*)
-    noconfigdirs="$noconfigdirs target-libiberty"
     libgloss_dir=m68hc11
     ;;
   m68k-*-elf*)
@@ -819,17 +894,14 @@
     ;;
   mmix-*-*)
     noconfigdirs="$noconfigdirs target-libffi target-boehm-gc gdb"
-    unsupported_languages="$unsupported_languages fortran java"
+    unsupported_languages="$unsupported_languages java"
     ;;
   mt-*-*)
     noconfigdirs="$noconfigdirs sim"
     ;;
-  picochip-*-*)
-    noconfigdirs="$noconfigdirs target-libiberty"
-    ;;
   powerpc-*-aix*)
     # copied from rs6000-*-* entry
-    noconfigdirs="$noconfigdirs gprof target-libgloss target-libssp target-newlib ${libgcj}"
+    noconfigdirs="$noconfigdirs gprof target-libgloss target-newlib ${libgcj}"
     ;;
   powerpc*-*-winnt* | powerpc*-*-pe*)
     target_configdirs="$target_configdirs target-winsup"
@@ -856,7 +928,7 @@
     noconfigdirs="$noconfigdirs target-newlib gprof ${libgcj}"
     ;;
   rs6000-*-aix*)
-    noconfigdirs="$noconfigdirs gprof target-libgloss target-libssp target-newlib ${libgcj}"
+    noconfigdirs="$noconfigdirs gprof target-libgloss target-newlib ${libgcj}"
     ;;
   rs6000-*-*)
     noconfigdirs="$noconfigdirs gprof ${libgcj}"
@@ -865,10 +937,9 @@
     noconfigdirs="$noconfigdirs ld binutils gprof target-libgloss"
     ;;
   microblaze*)
-    noconfigdirs="$noconfigdirs gprof target-libssp ${libgcj}"
+    noconfigdirs="$noconfigdirs gprof ${libgcj}"
     ;;
   mips*-sde-elf*)
-    skipdirs="$skipdirs target-libiberty"
     noconfigdirs="$noconfigdirs ${libgcj}"
     if test x$with_newlib = xyes; then
       noconfigdirs="$noconfigdirs gprof"
@@ -934,9 +1005,6 @@
   vax-*-*)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss ${libgcj}"
     ;;
-  ip2k-*-*)
-    noconfigdirs="$noconfigdirs target-libiberty"
-    ;;
   *-*-linux* | *-*-gnu* | *-*-k*bsd*-gnu | *-*-kopensolaris*-gnu)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;

-- 
Joseph S. Myers
joseph@codesourcery.com