[committed] small thread configury cleanup

[neroden at twcny dot rr dot com (Nathanael Nerode)]

I'd like to clean this up so much more, but I haven't quite worked out
the right way yet... so this is an interim cleanup, which needed to be
done anyway.

Bootstrapped i686-pc-linux-gnu, tested various appropriate configurations,
committing.

	* config.gcc: Stop changing enable_threads midstream.
	Replace uses of enable_threads_flag with enable_threads.
	* configure.ac: Replace uses of enable_threads_flag with
	enable_threads.  Improve autoconf quotation in one place.
	* configure: Regenerate.

Index: config.gcc
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config.gcc,v
retrieving revision 1.447
diff -u -r1.447 config.gcc
--- config.gcc	1 Apr 2004 16:05:16 -0000	1.447
+++ config.gcc	5 Apr 2004 05:22:24 -0000
@@ -30,7 +30,7 @@
 #
 #  with_*		Various variables as set by configure.
 #
-#  enable_threads_flag	Either the name, yes or no depending on whether
+#  enable_threads	Either the name, yes or no depending on whether
 #			threads support was requested.
 #
 #  default_use_cxa_atexit
@@ -167,7 +167,6 @@
 # configure entries modify them.
 gas="$gas_flag"
 gnu_ld="$gnu_ld_flag"
-enable_threads=$enable_threads_flag
 default_use_cxa_atexit=no
 target_gtfiles=
 need_64bit_hwint=
@@ -790,13 +789,15 @@
 	target_cpu_default="(MASK_PA_11 | MASK_BIG_SWITCH)"
 	tm_file="${tm_file} pa/pa32-regs.h dbxelf.h pa/som.h pa/pa-hpux.h pa/pa-hpux10.h"
 	tmake_file="pa/t-pa pa/t-pa-hpux pa/t-hpux-shlib"
-	if test x$enable_threads = x; then
-	    enable_threads=$have_pthread_h
-	fi
-	case x${enable_threads} in
-	xyes | xdce)
-		tmake_file="${tmake_file} pa/t-dce-thr"
-		;;
+	case ${enable_threads} in
+	  "")
+	    if test x$have_pthread_h = xyes ; then
+	      tmake_file="${tmake_file} pa/t-dce-thr"
+	    fi
+	    ;;
+	  yes | dce)
+	    tmake_file="${tmake_file} pa/t-dce-thr"
+	    ;;
 	esac
 	use_collect2=yes
 	use_fixproto=yes
@@ -804,13 +805,15 @@
 hppa1.0-*-hpux10*)
 	tm_file="${tm_file} pa/pa32-regs.h dbxelf.h pa/som.h pa/pa-hpux.h pa/pa-hpux10.h"
 	tmake_file="pa/t-pa pa/t-pa-hpux pa/t-hpux-shlib"
-	if test x$enable_threads = x; then
-	    enable_threads=$have_pthread_h
-	fi
-	case x${enable_threads} in
-	xyes | xdce)
-		tmake_file="${tmake_file} pa/t-dce-thr"
-		;;
+	case ${enable_threads} in
+	  "")
+	    if test x$have_pthread_h = xyes ; then
+	      tmake_file="${tmake_file} pa/t-dce-thr"
+	    fi
+	    ;;
+	  yes | dce)
+	    tmake_file="${tmake_file} pa/t-dce-thr"
+	    ;;
 	esac
 	use_collect2=yes
 	use_fixproto=yes
@@ -985,19 +988,11 @@
 		tmake_file="$tmake_file t-slibgcc-sld"
 	fi
 	extra_parts="crt1.o crti.o crtn.o gcrt1.o gmon.o crtbegin.o crtend.o"
-	if test x${enable_threads} = x; then
-	    enable_threads=$have_pthread_h
-	    if test x${enable_threads} = x; then
-		enable_threads=$have_thread_h
-	    fi
-	fi
-	if test x${enable_threads} = xyes; then
-	    if test x${have_pthread_h} = xyes; then
-		thread_file='posix'
-	    else
-		thread_file='solaris'
-	    fi
-	fi
+	case ${enable_threads}:${have_pthread_h}:${have_thread_h} in
+	  no:*:*) ;;
+	  *:yes:* ) thread_file=posix ;;
+	  yes:*:* | *:*:yes ) thread_file=solaris ;;
+	esac
 	;;
 i[34567]86-*-sysv5*)           # Intel x86 on System V Release 5
        tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h svr4.h i386/sysv4.h i386/sysv5.h"
@@ -1830,19 +1825,11 @@
 		tmake_file="$tmake_file t-slibgcc-sld"
 	fi
 	extra_parts="crt1.o crti.o crtn.o gcrt1.o crtbegin.o crtend.o"
-	if test x${enable_threads} = x ; then
-	    enable_threads=$have_pthread_h
-	    if test x${enable_threads} = x ; then
-		enable_threads=$have_thread_h
-	    fi
-	fi
-	if test x${enable_threads} = xyes ; then
-	    if test x${have_pthread_h} = xyes ; then
-		thread_file='posix'
-	    else
-		thread_file='solaris'
-	    fi
-	fi
+	case ${enable_threads}:${have_pthread_h}:${have_thread_h} in
+	  no:*:*) ;;
+	  *:yes:* ) thread_file=posix ;;
+	  yes:*:* | *:*:yes ) thread_file=solaris ;;
+	esac
 	need_64bit_hwint=yes
 	;;
 sparc-*-solaris2*)
@@ -1875,19 +1862,11 @@
 		;;
 	esac
 	extra_parts="crt1.o crti.o crtn.o gcrt1.o gmon.o crtbegin.o crtend.o"
-	if test x${enable_threads} = x; then
-	    enable_threads=$have_pthread_h
-	    if test x${enable_threads} = x; then
-		enable_threads=$have_thread_h
-	    fi
-	fi
-	if test x${enable_threads} = xyes; then
-	    if test x${have_pthread_h} = xyes; then
-		thread_file='posix'
-	    else
-		thread_file='solaris'
-	    fi
-	fi
+	case ${enable_threads}:${have_pthread_h}:${have_thread_h} in
+	  no:*:*) ;;
+	  *:yes:* ) thread_file=posix ;;
+	  yes:*:* | *:*:yes ) thread_file=solaris ;;
+	esac
 	;;
 sparc-*-sysv4*)
 	tm_file="${tm_file} dbxelf.h elfos.h svr4.h sparc/sysv4.h sparc/sysv4-only.h"
Index: configure.ac
===================================================================
RCS file: /cvs/gcc/gcc/gcc/configure.ac,v
retrieving revision 2.29
diff -u -r2.29 configure.ac
--- configure.ac	5 Apr 2004 03:58:42 -0000	2.29
+++ configure.ac	5 Apr 2004 05:22:26 -0000
@@ -571,9 +571,7 @@
 AC_ARG_ENABLE(threads,
 [  --enable-threads        enable thread usage for target GCC
   --enable-threads=LIB    use LIB thread package for target GCC],,
-enable_threads='')
-# Save in case it gets overwritten in config.gcc
-enable_threads_flag=$enable_threads
+[enable_threads=''])
 
 AC_ARG_ENABLE(objc-gc,
 [  --enable-objc-gc	  enable the use of Boehm's garbage collector with
@@ -1212,7 +1210,7 @@
 # ---------
 
 # Check if a valid thread package
-case ${enable_threads_flag} in
+case ${enable_threads} in
   "" | no)
     # No threads
     target_thread_file='single'
@@ -1223,10 +1221,10 @@
     ;;
   aix | dce | gnat | irix | posix | rtems | \
   single | solaris | vxworks | win32 )
-    target_thread_file=${enable_threads_flag}
+    target_thread_file=${enable_threads}
     ;;
   *)
-    echo "${enable_threads_flag} is an unknown thread package" 1>&2
+    echo "${enable_threads} is an unknown thread package" 1>&2
     exit 1
     ;;
 esac

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