Support using a different compiler for Objective-C files
MacOSX 10.8 ("Mountain Lion") requires us to compile our one
Objective-C source file with clang even if the rest of QEMU
requires a real gcc, because the system headers we use make
use of Apple's "Blocks" extension to C/ObjC, and mainline
gcc doesn't support that. Since we only need to use a true
gcc for the parts of QEMU that use the fixed-register
env variable, we can simply use clang to build the ObjC
file: it will link to the gcc-built objects with no problems.
Add the necessary support for an OBJCC variable in the
makefile and configure machinery; we default to clang
if we have it, otherwise whatever CC is (since gcc
might be the Apple gcc which does support Blocks).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/configure b/configure
index 6f6f8e0..f54326d 100755
--- a/configure
+++ b/configure
@@ -543,6 +543,13 @@
: ${python=${PYTHON-python}}
: ${smbd=${SMBD-/usr/sbin/smbd}}
+# Default objcc to clang if available, otherwise use CC
+if has clang; then
+ objcc=clang
+else
+ objcc="$cc"
+fi
+
if test "$mingw32" = "yes" ; then
EXESUF=".exe"
QEMU_CFLAGS="-DWIN32_LEAN_AND_MEAN -DWINVER=0x501 $QEMU_CFLAGS"
@@ -586,6 +593,8 @@
;;
--host-cc=*) host_cc="$optarg"
;;
+ --objcc=*) objcc="$optarg"
+ ;;
--make=*) make="$optarg"
;;
--install=*) install="$optarg"
@@ -1028,6 +1037,7 @@
echo " --cc=CC use C compiler CC [$cc]"
echo " --host-cc=CC use C compiler CC [$host_cc] for code run at"
echo " build time"
+echo " --objcc=OBJCC use Objective-C compiler OBJCC [$objcc]"
echo " --extra-cflags=CFLAGS append extra C compiler flags QEMU_CFLAGS"
echo " --extra-ldflags=LDFLAGS append extra linker flags LDFLAGS"
echo " --make=MAKE use specified make [$make]"
@@ -3058,6 +3068,7 @@
echo "Source path $source_path"
echo "C compiler $cc"
echo "Host C compiler $host_cc"
+echo "Objective-C compiler $objcc"
echo "CFLAGS $CFLAGS"
echo "QEMU_CFLAGS $QEMU_CFLAGS"
echo "LDFLAGS $LDFLAGS"
@@ -3521,6 +3532,7 @@
echo "CC=$cc" >> $config_host_mak
echo "CC_I386=$cc_i386" >> $config_host_mak
echo "HOST_CC=$host_cc" >> $config_host_mak
+echo "OBJCC=$objcc" >> $config_host_mak
echo "AR=$ar" >> $config_host_mak
echo "OBJCOPY=$objcopy" >> $config_host_mak
echo "LD=$ld" >> $config_host_mak
