Remove the C backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153307 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/projects/sample/autoconf/configure.ac b/projects/sample/autoconf/configure.ac
index 25d678a..d52574f 100644
--- a/projects/sample/autoconf/configure.ac
+++ b/projects/sample/autoconf/configure.ac
@@ -554,7 +554,7 @@
   enableval=host
 fi
 case "$enableval" in
-  all) TARGETS_TO_BUILD="X86 Sparc PowerPC ARM Mips CellSPU XCore MSP430 Hexagon CBackend CppBackend MBlaze PTX" ;;
+  all) TARGETS_TO_BUILD="X86 Sparc PowerPC ARM Mips CellSPU XCore MSP430 Hexagon CppBackend MBlaze PTX" ;;
   *)for a_target in `echo $enableval|sed -e 's/,/ /g' ` ; do
       case "$a_target" in
         x86)      TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
@@ -567,7 +567,6 @@
         xcore)    TARGETS_TO_BUILD="XCore $TARGETS_TO_BUILD" ;;
         msp430)   TARGETS_TO_BUILD="MSP430 $TARGETS_TO_BUILD" ;;
         hexagon)  TARGETS_TO_BUILD="Hexagon $TARGETS_TO_BUILD" ;;
-        cbe)      TARGETS_TO_BUILD="CBackend $TARGETS_TO_BUILD" ;;
         cpp)      TARGETS_TO_BUILD="CppBackend $TARGETS_TO_BUILD" ;;
         mblaze)   TARGETS_TO_BUILD="MBlaze $TARGETS_TO_BUILD" ;;
         ptx)      TARGETS_TO_BUILD="PTX $TARGETS_TO_BUILD" ;;
@@ -644,21 +643,6 @@
 AC_SUBST(LLVM_ENUM_ASM_PARSERS)
 AC_SUBST(LLVM_ENUM_DISASSEMBLERS)
 
-dnl Prevent the CBackend from using printf("%a") for floating point so older
-dnl C compilers that cannot deal with the 0x0p+0 hex floating point format
-dnl can still compile the CBE's output
-AC_ARG_ENABLE([cbe-printf-a],AS_HELP_STRING([--enable-cbe-printf-a],
-  [Enable C Backend output with hex floating point via %a  (default is YES)]),,
-  enableval=default)
-case "$enableval" in
-  yes) AC_SUBST(ENABLE_CBE_PRINTF_A,[1]) ;;
-  no)  AC_SUBST(ENABLE_CBE_PRINTF_A,[0]) ;;
-  default)  AC_SUBST(ENABLE_CBE_PRINTF_A,[1]) ;;
-  *) AC_MSG_ERROR([Invalid setting for --enable-cbe-printf-a. Use "yes" or "no"]) ;;
-esac
-AC_DEFINE_UNQUOTED([ENABLE_CBE_PRINTF_A],$ENABLE_CBE_PRINTF_A,
-                   [Define if CBE is enabled for printf %a output])
-
 dnl Override the option to use for optimized builds.
 AC_ARG_WITH(optimize-option,
   AS_HELP_STRING([--with-optimize-option],