GCC configure.in cleanup 2/n

[Nathanael Nerode]

A first pass at putting configure.in in some sort of order.  I'm quite
sure everything I moved is safe to move over the regions I moved them over.
Tested on i686-pc-linux-gnu.

	* configure.in: Start to organize.
	* configure: Regenerate.

--- configure.in	2003-02-28 22:03:42.000000000 -0500
+++ configure.in.new	2003-02-28 22:03:21.000000000 -0500
@@ -21,11 +21,20 @@
 #Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #02111-1307, USA.
 
-# Initialization and defaults
+# --------------------------------
+# Initialization and sanity checks
+# --------------------------------
+
 AC_PREREQ(2.13)
 AC_INIT(tree.c)
 AC_CONFIG_HEADER(auto-host.h:config.in)
 
+# Determine the host, build, and target systems
+AC_CANONICAL_SYSTEM
+
+# Set program_transform_name
+AC_ARG_PROGRAM
+
 # Check for bogus environment variables.
 # Test if LIBRARY_PATH contains the notation for the current directory
 # since this would lead to problems installing/building glibc.
@@ -79,7 +88,9 @@
 *** and run configure again.])
 fi
 
-# Check for additional parameters
+# -----------
+# Find linker
+# -----------
 
 # With GNU ld
 AC_ARG_WITH(gnu-ld,
@@ -101,6 +112,21 @@
 	[Define to enable the use of a default linker.])
 fi
 
+AC_MSG_CHECKING([whether a default linker was specified])
+if test x"${DEFAULT_LINKER+set}" = x"set"; then
+  if test x"$gnu_ld_flag" = x"no"; then
+    AC_MSG_RESULT([yes ($DEFAULT_LINKER)])
+  else
+    AC_MSG_RESULT([yes ($DEFAULT_LINKER - GNU ld)])
+  fi
+else
+  AC_MSG_RESULT(no)
+fi
+
+# --------------
+# Find assembler
+# --------------
+
 # With GNU as
 AC_ARG_WITH(gnu-as,
 [  --with-gnu-as           arrange to work with GNU as],
@@ -120,6 +146,21 @@
 	[Define to enable the use of a default assembler.])
 fi
 
+AC_MSG_CHECKING([whether a default assembler was specified])
+if test x"${DEFAULT_ASSEMBLER+set}" = x"set"; then
+  if test x"$gas_flag" = x"no"; then
+    AC_MSG_RESULT([yes ($DEFAULT_ASSEMBLER)])
+  else
+    AC_MSG_RESULT([yes ($DEFAULT_ASSEMBLER - GNU as)])
+  fi
+else
+  AC_MSG_RESULT(no)
+fi
+
+# --------
+# UNSORTED
+# --------
+
 # With stabs
 AC_ARG_WITH(stabs,
 [  --with-stabs            arrange to use stabs instead of host debug format],
@@ -172,11 +213,9 @@
   fi
 fi
 
-# Determine the host, build, and target systems
-AC_CANONICAL_SYSTEM
-
-# Set program_transform_name
-AC_ARG_PROGRAM
+# ---------------
+# Find C compiler
+# ---------------
 
 # Find the native compiler
 AC_PROG_CC
@@ -190,9 +229,6 @@
 AC_SUBST(NO_MINUS_C_MINUS_O)
 AC_SUBST(OUTPUT_OPTION)
 
-# See if GNAT has been installed
-gcc_AC_PROG_GNAT
-
 AC_CACHE_CHECK(whether ${CC-cc} accepts -Wno-long-long,
 ac_cv_prog_cc_no_long_long,
 [save_CFLAGS="$CFLAGS"
@@ -201,6 +237,13 @@
 	       ac_cv_prog_cc_no_long_long=no)
 CFLAGS="$save_CFLAGS"])
 
+# -----------------
+# Find Ada compiler
+# -----------------
+
+# See if GNAT has been installed
+gcc_AC_PROG_GNAT
+
 if test x$have_gnat != xno ; then 
 AC_CACHE_CHECK(whether ${ADAC} accepts -Wno-long-long,
 ac_cv_prog_adac_no_long_long,
@@ -217,6 +260,10 @@
   ac_cv_prog_adac_no_long_long=yes
 fi
 
+# --------
+# UNSORTED
+# --------
+
 strict1_warn=
 if test $ac_cv_prog_cc_no_long_long = yes && \
     test $ac_cv_prog_adac_no_long_long = yes ; then
@@ -540,28 +587,6 @@
 
 AC_PROG_MAKE_SET
 
-AC_MSG_CHECKING([whether a default assembler was specified])
-if test x"${DEFAULT_ASSEMBLER+set}" = x"set"; then
-    if test x"$gas_flag" = x"no"; then
-    	AC_MSG_RESULT([yes ($DEFAULT_ASSEMBLER)])
-    else
-	AC_MSG_RESULT([yes ($DEFAULT_ASSEMBLER - GNU as)])
-    fi
-else
-    AC_MSG_RESULT(no)
-fi
-
-AC_MSG_CHECKING([whether a default linker was specified])
-if test x"${DEFAULT_LINKER+set}" = x"set"; then
-    if test x"$gnu_ld_flag" = x"no"; then
-	AC_MSG_RESULT([yes ($DEFAULT_LINKER)])
-    else
-	AC_MSG_RESULT([yes ($DEFAULT_LINKER - GNU ld)])
-    fi
-else
-    AC_MSG_RESULT(no)
-fi
-
 AC_MSG_CHECKING(for GNU C library)
 AC_CACHE_VAL(gcc_cv_glibc,
 [AC_TRY_COMPILE(