[Qemu-devel] [PATCH 1/2] configure: Define OS_OBJECT_USE_OBJC=0 for MacOSX builds

[Peter Maydell]

MacOSX 10.8 ("Mountain Lion") defaults to trying to use automated
reference counting on certain objects.  This means that the system
header files will use some Objective C syntax constructs even when
compiling pure C, which confuses mainline gcc. Suppress this by
setting OS_OBJECT_USE_OBJC=0. This avoids a compile error like this:

In file included from
/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:5:0,
                 from /usr/include/os/object.h:74,
                 from /usr/include/dispatch/dispatch.h:48,
                 from 
/System/Library/Frameworks/IOKit.framework/Headers/IOKitLib.h:56,
                 from block/raw-posix.c:35:
/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:409:1: 
error: stray address@hidden in program
[with a large number of further run-on errors]

Signed-off-by: Peter Maydell <address@hidden>
---
 configure | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure b/configure
index f0dbc03..be4a2bb 100755
--- a/configure
+++ b/configure
@@ -452,6 +452,9 @@ Darwin)
   audio_possible_drivers="coreaudio sdl fmod"
   LDFLAGS="-framework CoreFoundation -framework IOKit $LDFLAGS"
   libs_softmmu="-F/System/Library/Frameworks -framework Cocoa -framework IOKit 
$libs_softmmu"
+  # Disable attempts to use ObjectiveC features in os/object.h since they
+  # won't work when we're compiling with gcc as a C compiler.
+  QEMU_CFLAGS="-DOS_OBJECT_USE_OBJC=0 $QEMU_CFLAGS"
 ;;
 SunOS)
   solaris="yes"
-- 
1.7.11.4