configure.in: Rename to configure.ac.

	* configure.in: Rename to configure.ac.
	* configure.ac: Renamed from configure.in; make minimum necessary
	changes for autoconf 2.5x.
	* aclocal.m4: Make minimum necessary changes for autoconf 2.5x.
	* configure: Regenerate with autoconf 2.57.

From-SVN: r75362

gcc/ChangeLog

+2004-01-03  Nathanael Nerode  <neroden@gcc.gnu.org>
+
+	* configure.in: Rename to configure.ac.
+	* configure.ac: Renamed from configure.in; make minimum necessary
+	changes for autoconf 2.5x.
+	* aclocal.m4: Make minimum necessary changes for autoconf 2.5x.
+	* configure: Regenerate with autoconf 2.57.
+
 2004-01-03  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/mips/linux.h: Fix comment formatting.

gcc/aclocal.m4

@@ -753,7 +753,7 @@ AC_DEFUN([gcc_GAS_CHECK_FEATURE],
   if test $in_tree_gas = yes; then
     gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])
   el])if test x$gcc_cv_as != x; then
-    echo ifelse(substr([$5],0,1),[$], "[$5]", '[$5]') > conftest.s
+    echo ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]') > conftest.s
     if AC_TRY_COMMAND([$gcc_cv_as $4 -o conftest.o conftest.s >&AC_FD_CC])
     then
 	ifelse([$6],, [$2]=yes, [$6])

gcc/configure.in → gcc/configure.ac

@@ -25,7 +25,7 @@
 # Initialization and sanity checks
 # --------------------------------
 
-AC_PREREQ(2.13)
+AC_PREREQ(2.57)
 AC_INIT(tree.c)
 AC_CONFIG_HEADER(auto-host.h:config.in)
 
@@ -1973,15 +1973,16 @@ __FRAME_BEGIN__:
 	.byte	0x4
 	.4byte	.L1-.LFB1
 .LEFDE1:],
-[  cat > conftest.lit <<EOF
+[  dnl # For autoconf 2.5x, must protect trailing spaces with @&t@.
+cat > conftest.lit <<EOF
  0000 10000000 00000000 017a0001 781a0004  .........z..x...
  0010 01000000 12000000 18000000 00000000  ................
- 0020 08000000 04080000 0044               .........D      
+ 0020 08000000 04080000 0044               .........D      @&t@
 EOF
-  cat > conftest.big <<EOF
+cat > conftest.big <<EOF
  0000 00000010 00000000 017a0001 781a0004  .........z..x...
  0010 00000001 00000012 00000018 00000000  ................
- 0020 00000008 04000000 0844               .........D      
+ 0020 00000008 04000000 0844               .........D      @&t@
 EOF
   # If the assembler didn't choke, and we can objdump,
   # and we got the correct data, then succeed.