Add sparse checker support to the build system (Gerd Hoffman)

This adds support for running the sparse checker during the build
process.  Left it off by default for now, build becomes very noisy with
sparse checking turned on as it has to complain alot (partly even in the
system headers!).  The qemu code base needs quite some cleanups before
we should consider turning it on by default.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5440 c046a42c-6fe2-441c-8c8c-71466251a162

configure

@@ -85,6 +85,7 @@ case "$cpu" in
   ;;
 esac
 gprof="no"
+sparse="no"
 bigendian="no"
 mingw32="no"
 EXESUF=""
@@ -285,6 +286,10 @@ for opt do
   ;;
   --audio-drv-list=*) audio_drv_list="$optarg"
   ;;
+  --enable-sparse) sparse="yes"
+  ;;
+  --disable-sparse) sparse="no"
+  ;;
   --disable-vnc-tls) vnc_tls="no"
   ;;
   --disable-slirp) slirp="no"
@@ -422,6 +427,7 @@ echo "  --host-cc=CC             use C compiler CC [$host_cc] for dyngen etc."
 echo "  --make=MAKE              use specified make [$make]"
 echo "  --install=INSTALL        use specified install [$install]"
 echo "  --static                 enable static build [$static]"
+echo "  --disable-sparse         disable sparse checker"
 echo "  --disable-werror         disable compilation abort on warning"
 echo "  --disable-sdl            disable SDL"
 echo "  --enable-cocoa           enable COCOA (Mac OS X only)"
@@ -532,6 +538,10 @@ EOF
     fi
 fi
 
+if test ! -x "$(which cgcc 2>/dev/null)"; then
+    sparse="no"
+fi
+
 #
 # Solaris specific configure tool chain decisions
 #
@@ -987,6 +997,7 @@ echo "host CPU          $cpu"
 echo "host big endian   $bigendian"
 echo "target list       $target_list"
 echo "gprof enabled     $gprof"
+echo "sparse enabled    $sparse"
 echo "profiler          $profiler"
 echo "static build      $static"
 echo "-Werror enabled   $werror"
@@ -1135,6 +1146,11 @@ case "$cpu" in
     exit 1
   ;;
 esac
+if test "$sparse" = "yes" ; then
+  echo "CC      := REAL_CC=\"\$(CC)\" cgcc"       >> $config_mak
+  echo "HOST_CC := REAL_CC=\"\$(HOST_CC)\" cgcc"  >> $config_mak
+  echo "CFLAGS  += -Wbitwise -Wno-transparent-union -Wno-old-initializer -Wno-non-pointer-null" >> $config_mak
+fi
 if test "$bigendian" = "yes" ; then
   echo "WORDS_BIGENDIAN=yes" >> $config_mak
   echo "#define WORDS_BIGENDIAN 1" >> $config_h