[Qemu-devel] [PATCH][RFC] configure changes to support cross compiling with mingw32

[Anthony Liguori]

--enable-mingw32 hasn't ever worked for me.  The follow patch is a set 
of changes to configure so that --cross-prefix=i586-mingw32-msvc does 
the right thing.

It needs some testing.  It works for me but I don't know if people have 
weird setups where the gcc cross prefix != the sdl cross prefix or 
something odd like that.

Regards,

Anthony Liguori

# HG changeset patch
# User Anthony Liguori <address@hidden>
# Node ID 157550eed1f5e456a0f43167bd21bc14ad164d51
# Parent  bda9c89460daa713765b316ea8ef1bfe7fd79091
A number of fixes to configure while getting cross compiling with mingw32 to
work.

Remove the --enable-mingw option.  It hardcoded a cross-compile prefix and a
different prefix is used on the mingw32 tools on some distros.  Now:

 ./configure --cross-prefix=i586-mingw32msvc- ...

will do the Right Thing so --enable-mingw is no longer needed.

Add a check after $cc includes the cross-compile prefix so we can determine
what the target really is (as opposed to using uname).

Remove the check for test -e for /usr/include/byteswap.h to a compile check.
This breaks cross compiling.

Add a check for zlib so that we give a nice error if zlib-devel is missing.

Use ${cross_prefix}sdl-config

When we exit, make sure to remove TMP files.

diff -r bda9c89460da -r 157550eed1f5 configure
--- a/configure Sat Jul 22 22:06:44 2006 +0000
+++ b/configure Tue Jul 25 15:13:19 2006 -0500
@@ -213,8 +213,6 @@ for opt do
   ;;
   --fmod-inc=*) fmod_inc="$optarg"
   ;;
-  --enable-mingw32) mingw32="yes" ; cross_prefix="i386-mingw32-" ; user="no"
-  ;;
   --disable-slirp) slirp="no"
   ;;
   --enable-adlib) adlib="yes"
@@ -278,7 +276,6 @@ echo "  --install=INSTALL        use spe
 echo "  --install=INSTALL        use specified install [$install]"
 echo "  --static                 enable static build [$static]"
 echo "  --enable-cocoa           enable COCOA (Mac OS X only)"
-echo "  --enable-mingw32         enable Win32 cross compilation with mingw32"
 echo "  --enable-adlib           enable Adlib emulation"
 echo "  --enable-coreaudio       enable Coreaudio audio driver"
 echo "  --enable-alsa            enable ALSA audio driver"
@@ -301,6 +298,23 @@ ar="${cross_prefix}${ar}"
 ar="${cross_prefix}${ar}"
 strip="${cross_prefix}${strip}"
 
+# we really ought move the whole archecture check down here
+targetos=`$cc -dumpmachine`
+case $targetos in
+    *-mingw32msvc)
+       mingw32="yes"
+       oss="no"
+       user="no"
+       linux="no" # hack
+       EXESUF=".exe"
+       if [ "$cpu" = "i386" ] ; then
+           kqemu="yes"
+       fi
+       ;;
+    *)
+       ;;
+esac
+
 # check that the C compiler works.
 cat > $TMPC <<EOF
 int main(void) {}
@@ -311,15 +325,6 @@ else
 else
     echo "ERROR: \"$cc\" either does not exist or does not work"
     exit 1
-fi
-
-if test "$mingw32" = "yes" ; then
-    linux="no"
-    EXESUF=".exe"
-    oss="no"
-    if [ "$cpu" = "i386" ] ; then
-        kqemu="yes"
-    fi
 fi
 
 #
@@ -437,10 +442,29 @@ EOF
         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"
+       rm -f $TMPO $TMPC $TMPE $TMPS
         exit 1;
     fi
 fi
 
+# Check for zlib
+cat > $TMPC <<EOF
+#include <zlib.h>
+int main(){(void)zlibVersion(); return 0;}
+EOF
+if $cc -o $TMPE $TMPC -lz 2>/dev/null; then
+    zlib="yes"
+else
+    zlib="no"
+fi
+
+if test "$zlib" = "no"; then
+    echo "ERROR: QEMU requires the zlib library.  You may have to install"
+    echo "the development package."
+    rm -f $TMPO $TMPC $TMPE $TMPS
+    exit 1;
+fi
+
 ##########################################
 # SDL probe
 
@@ -448,15 +472,10 @@ sdl_too_old=no
 
 if test -z "$sdl" ; then
 
-sdl_config="sdl-config"
+sdl_config="${cross-prefix}sdl-config"
 sdl=no
 sdl_static=no
 
-if test "$mingw32" = "yes" -a ! -z "$cross_prefix" ; then
-# win32 cross compilation case
-    sdl_config="i386-mingw32msvc-sdl-config"
-    sdl=yes
-else
 # normal SDL probe
 cat > $TMPC << EOF
 #include <SDL.h>
@@ -489,7 +508,6 @@ fi # static link
 
 fi # sdl compile test
 
-fi # cross compilation
 fi # -z $sdl
 
 # Check if tools are available to build documentation.
@@ -540,7 +558,6 @@ if test "$sdl" != "no" ; then
 if test "$sdl" != "no" ; then
     echo "SDL static link   $sdl_static"
 fi
-echo "mingw32 support   $mingw32"
 echo "Adlib support     $adlib"
 echo "CoreAudio support $coreaudio"
 echo "ALSA support      $alsa"
@@ -573,6 +590,13 @@ config_h="config-host.h"
 config_h="config-host.h"
 
 #echo "Creating $config_mak and $config_h"
+
+have_header() {
+    cat > $TMPC <<EOF
+#include <$1>
+EOF
+    $cc -c -o $TMPO $TMPC 2>/dev/null
+}
 
 echo "# Automatically generated by configure - do not modify" > $config_mak
 echo "# Configured with: $0 $@" >> $config_mak
@@ -644,7 +668,7 @@ if test "$mingw32" = "yes" ; then
 if test "$mingw32" = "yes" ; then
   echo "CONFIG_WIN32=yes" >> $config_mak
   echo "#define CONFIG_WIN32 1" >> $config_h
-elif test -f "/usr/include/byteswap.h" ; then
+elif have_header "/usr/include/byteswap.h" ; then
   echo "#define HAVE_BYTESWAP_H 1" >> $config_h
 fi
 if test "$darwin" = "yes" ; then