[Qemu-devel] [RFC] normalize error messages and use stderr in configure

[Carlo Marcelo Arenas Belon <carenas@sajinet.com.pe>]

The following patch normalizes all (most) messages as generated by configure
so they are flagged as ERROR or WARNING (left some of the ones that look more
informative without a flag even if they result in a fatal error).

All those messages are directed to stderr so they can be filtered/identified
correctly if analyzed mechanically.  Usage information is left in stdout as it
doesn't denote abnormal behavior.

The patch is based on a modified tree (which includes several of the previous
patches sent) and won't apply cleanly and so it is not ready for merge yet.

Carlo

---
Index: configure
===================================================================
RCS file: /sources/qemu/qemu/configure,v
retrieving revision 1.165
diff -u -r1.165 configure
--- configure	18 Oct 2007 20:51:48 -0000	1.165
+++ configure	23 Oct 2007 02:49:16 -0000
@@ -169,10 +168,10 @@
             if test -f /opt/SUNWspro/prod/lib/libsunmath.so.1; then
                 needs_libsunmath="yes"
             else
-                echo "QEMU will not link correctly on Solaris 8/X86 or 9/x86 without"
-                echo "libsunmath from the Sun Studio compilers tools, due to a lack of"
-                echo "C99 math features in libm.so in Solaris 8/x86 and Solaris 9/x86"
-                echo "Studio 11 can be downloaded from www.sun.com."
+                echo "QEMU will not link correctly on Solaris 8/X86 or 9/x86 without" 1>&2
+                echo "libsunmath from the Sun Studio compilers tools, due to a lack of" 1>&2
+                echo "C99 math features in libm.so in Solaris 8/x86 and Solaris 9/x86" 1>&2
+                echo "Studio 11 can be downloaded from www.sun.com." 1>&2
                 exit 1
             fi
         fi
@@ -303,9 +300,11 @@
                  target_cpu="sparc"; cpu="sparc" ;;
         v9)    SP_CFLAGS="-m64 -mcpu=ultrasparc -D__sparc_${sparc_cpu}__"; SP_LDFLAGS="-m64"
                  target_cpu="sparc64"; cpu="sparc64" ;;
-        *)     echo "undefined SPARC architecture. Exiting";exit 1;;
+        *)     echo "ERROR: undefined SPARC architecture. Exiting" 1>&2; exit 1;;
       esac
   ;;
+  *) echo "ERROR: unknown option $opt" 1>&2; show_help="yes"
+  ;;
   esac
 done
 
@@ -412,7 +412,7 @@
 if $cc -c -o $TMPO $TMPC 2> /dev/null ; then
   : C compiler works ok
 else
-    echo "ERROR: \"$cc\" either does not exist or does not work"
+    echo "ERROR: \"$cc\" either does not exist or does not work" 1>&2
     exit 1
 fi
 
@@ -431,26 +431,26 @@
 int main(){return 0;}
 EOF
     if "$cc" -o $TMPE $TMPC 2> /dev/null ; then
-	echo "WARNING: \"$cc\" looks like gcc 4.x"
+	echo "WARNING: \"$cc\" looks like gcc 4.x" 1>&2
 	found_compat_cc="no"
 	if test "$gcc3_search" = "yes" ; then
-	    echo "Looking for gcc 3.x"
+	    echo "Looking for gcc 3.x" 1>&2
 	    for compat_cc in $gcc3_list ; do
 		if "$cross_prefix$compat_cc" --version 2> /dev/null | fgrep '(GCC) 3.' > /dev/null 2>&1 ; then
-		    echo "Found \"$compat_cc\""
+		    echo "Found \"$compat_cc\"" 1>&2
 		    cc="$cross_prefix$compat_cc"
 		    found_compat_cc="yes"
 		    break
 		fi
 	    done
 	    if test "$found_compat_cc" = "no" ; then
-		echo "gcc 3.x not found!"
+		echo "ERROR: gcc 3.x not found!" 1>&2
 	    fi
 	fi
 	if test "$found_compat_cc" = "no" ; then
-	    echo "QEMU is known to have problems when compiled with gcc 4.x"
-	    echo "It is recommended that you use gcc 3.x to build QEMU"
-	    echo "To use this compiler anyway, configure with --disable-gcc-check"
+	    echo "QEMU is known to have problems when compiled with gcc 4.x" 1>&2
+	    echo "It is recommended that you use gcc 3.x to build QEMU" 1>&2
+	    echo "To use this compiler anyway, configure with --disable-gcc-check" 1>&2
 	    exit 1;
 	fi
     fi
@@ -467,30 +467,30 @@
   if test "$solarisrev" -eq 10 -a "$check_gcc" = "yes" ; then
     solgcc=`which $cc`
     if test "$solgcc" = "/usr/sfw/bin/gcc" ; then
-      echo "Solaris 10/FCS gcc in /usr/sfw/bin will not compiled qemu correctly."
-      echo "please get gcc-3.4.3 or later, from www.blastwave.org using pkg-get -i gcc3"
-      echo "or get the latest patch from SunSolve for gcc"
+      echo "Solaris 10/FCS gcc in /usr/sfw/bin will not compiled qemu correctly." 1>&2
+      echo "please get gcc-3.4.3 or later, from www.blastwave.org using pkg-get -i gcc3" 1>&2
+      echo "or get the latest patch from SunSolve for gcc" 1>&2
       exit 1
     fi
   fi
   solinst=`which $install 2> /dev/null | /usr/bin/grep -v "no $install in"`
   if test -z "$solinst" ; then
-    echo "Solaris install program not found. Use --install=/usr/ucb/install or"
-    echo "install fileutils from www.blastwave.org using pkg-get -i fileutils"
-    echo "to get ginstall which is used by default (which lives in /opt/csw/bin)"
+    echo "Solaris install program not found. Use --install=/usr/ucb/install or" 1>&2
+    echo "install fileutils from www.blastwave.org using pkg-get -i fileutils" 1>&2
+    echo "to get ginstall which is used by default (which lives in /opt/csw/bin)" 1>&2
     exit 1
   fi
   if test "$solinst" = "/usr/sbin/install" ; then
-    echo "Error: Solaris /usr/sbin/install is not an appropriate install program."
-    echo "try ginstall from the GNU fileutils available from www.blastwave.org"
-    echo "using pkg-get -i fileutils, or use --install=/usr/ucb/install"
+    echo "Solaris /usr/sbin/install is not an appropriate install program." 1>&2
+    echo "try ginstall from the GNU fileutils available from www.blastwave.org" 1>&2
+    echo "using pkg-get -i fileutils, or use --install=/usr/ucb/install" 1>&2
     exit 1
   fi
   sol_ar=`which ar 2> /dev/null | /usr/bin/grep -v "no ar in"`
   if test -z "$sol_ar" ; then
-    echo "Error: No path includes ar"
+    echo "ERROR: No path includes ar" 1>&2
     if test -f /usr/ccs/bin/ar ; then
-      echo "Add /usr/ccs/bin to your path and rerun configure"
+      echo "Add /usr/ccs/bin to your path and rerun configure" 1>&2
     fi
     exit 1
   fi
@@ -514,7 +514,7 @@
     target_list=`echo "$target_list" | sed -e 's/,/ /g'`
 fi
 if test -z "$target_list" ; then
-    echo "No targets enabled"
+    echo "ERROR: No targets enabled" 1>&2
     exit 1
 fi
 
@@ -633,8 +633,8 @@
     :
   else
     echo
-    echo "Error: Could not find alsa"
-    echo "Make sure to have the alsa libs and headers installed."
+    echo "ERROR: Could not find alsa" 1>&2
+    echo "Make sure to have the alsa libs and headers installed." 1>&2
     echo
     exit 1
   fi
@@ -697,8 +697,8 @@
 if test "$fmod" = "yes"; then
     if test -z $fmod_lib || test -z $fmod_inc; then
         echo
-        echo "Error: You must specify path to FMOD library and headers"
-        echo "Example: --fmod-inc=/path/include/fmod --fmod-lib=/path/lib/libfmod-3.74.so"
+        echo "ERROR: You must specify path to FMOD library and headers" 1>&2
+        echo "Example: --fmod-inc=/path/include/fmod --fmod-lib=/path/lib/libfmod-3.74.so" 1>&2
         echo
         exit 1
     fi
@@ -722,11 +722,11 @@
 echo "uname -r          $uname_release"
 
 if test $sdl_too_old = "yes"; then
-echo "-> Your SDL version is too old - please upgrade to have SDL support"
+echo "ERROR: Your SDL version is too old - please upgrade to have SDL support" 1>&2
 fi
 if [ -s /tmp/qemu-$$-sdl-config.log ]; then
-  echo "The error log from compiling the libSDL test is: "
-  cat /tmp/qemu-$$-sdl-config.log
+  echo "The error log from compiling the libSDL test is: " 1>&2
+  cat /tmp/qemu-$$-sdl-config.log 1>&2
 fi
 rm -f /tmp/qemu-$$-sdl-config.log
 #if test "$sdl_static" = "no"; then
@@ -807,7 +807,7 @@
   echo "ARCH=m68k" >> $config_mak
   echo "#define HOST_M68K 1" >> $config_h
 else
-  echo "Unsupported CPU = $cpu"
+  echo "ERROR: Unsupported CPU = $cpu" 1>&2
   exit 1
 fi
 if test "$bigendian" = "yes" ; then
@@ -961,17 +961,15 @@
     target_darwin_user="yes"
     ;;
   *)
-    echo "ERROR: Target '$target' not recognised"
+    echo "ERROR: Target '$target' not recognised" 1>&2
     exit 1
     ;;
 esac
 
-if test "$target_user_only" = "no" -a "$check_gfx" = "yes" \
-        -a "$sdl" = "no" -a "$cocoa" = "no" ; then
-    echo "ERROR: QEMU requires SDL or Cocoa for graphical output"
-    echo "To build QEMU without graphical output configure with --disable-gfx-check"
-    echo "Note that this will disable all output from the virtual graphics card."
-    exit 1;
+if test "$target_user_only" = "no" -a "$sdl" = "no" -a "$cocoa" = "no" ; then
+    echo "WARNING: QEMU requires SDL or Cocoa for graphical output" 1>&2
+    echo "Note that in order to be able to attach to the console you'll" 1>&2
+    echo "need to start qemu's vncserver with --vnc and use a vnc client." 1>&2
 fi
 
 #echo "Creating $config_mak, $config_h and $target_dir/Makefile"
@@ -1108,7 +1106,7 @@
   echo "#define TARGET_ARCH \"alpha\"" >> $config_h
   echo "#define TARGET_ALPHA 1" >> $config_h
 else
-  echo "Unsupported target CPU"
+  echo "ERROR: Unsupported target CPU" 1>&2
   exit 1
 fi
 if test "$target_bigendian" = "yes" ; then