aclocal.m4: Work around a bug in AC_PATH_PROGS when its last argument is empty.

* aclocal.m4: Work around a bug in AC_PATH_PROGS when its last
	argument is empty.
	* configure: Regenerate.

From-SVN: r101664

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2005-07-06  Paul Brook  <paul@codesourcery.com>
+
+	* aclocal.m4: Work around a bug in AC_PATH_PROGS when its last
+	argument is empty.
+	* configure: Regenerate.
+
 2005-07-06  J"orn Rennecke <joern.rennecke@st.com>
 
 	* sh.c (final_prescan_insn): Undo bogus change from 2005-05-09.

gcc/aclocal.m4

@@ -711,7 +711,13 @@ dnl shut up useless "checking for..." messages
 dnl we can still read them in config.log
 exec AS_MESSAGE_FD([])>/dev/null
 if test "x[$]$1" = x; then
-	AC_PATH_PROGS($1, $2, , $gcc_cv_tool_dirs)
+	# The AC_PATH_PROGS macro doesn't work properly when its 4th argument
+	# is empty.
+	if test "x$gcc_cv_tool_dirs" = x; then
+		$1=
+	else
+		AC_PATH_PROGS($1, $2, , $gcc_cv_tool_dirs)
+	fi
 fi
 if test "x[$]$1" = x; then
 	# If the loop above did not find a tool, then use whatever

gcc/configure

@@ -12896,7 +12896,12 @@ fi
 
 exec 6>/dev/null
 if test "x$gcc_cv_as" = x; then
-	for ac_prog in as
+	# The AC_PATH_PROGS macro doesn't work properly when its 4th argument
+	# is empty.
+	if test "x$gcc_cv_tool_dirs" = x; then
+		gcc_cv_as=
+	else
+		for ac_prog in as
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -12940,6 +12945,7 @@ fi
   test -n "$gcc_cv_as" && break
 done
 
+	fi
 fi
 if test "x$gcc_cv_as" = x; then
 	# If the loop above did not find a tool, then use whatever
@@ -13068,7 +13074,12 @@ fi
 
 exec 6>/dev/null
 if test "x$gcc_cv_ld" = x; then
-	for ac_prog in ld
+	# The AC_PATH_PROGS macro doesn't work properly when its 4th argument
+	# is empty.
+	if test "x$gcc_cv_tool_dirs" = x; then
+		gcc_cv_ld=
+	else
+		for ac_prog in ld
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -13112,6 +13123,7 @@ fi
   test -n "$gcc_cv_ld" && break
 done
 
+	fi
 fi
 if test "x$gcc_cv_ld" = x; then
 	# If the loop above did not find a tool, then use whatever
@@ -13206,7 +13218,12 @@ fi
 
 exec 6>/dev/null
 if test "x$gcc_cv_nm" = x; then
-	for ac_prog in nm
+	# The AC_PATH_PROGS macro doesn't work properly when its 4th argument
+	# is empty.
+	if test "x$gcc_cv_tool_dirs" = x; then
+		gcc_cv_nm=
+	else
+		for ac_prog in nm
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -13250,6 +13267,7 @@ fi
   test -n "$gcc_cv_nm" && break
 done
 
+	fi
 fi
 if test "x$gcc_cv_nm" = x; then
 	# If the loop above did not find a tool, then use whatever