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Support using a different compiler for Objective-C files

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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>
This commit is contained in:
Peter Maydell 2012-08-11 22:34:40 +01:00 committed by Anthony Liguori
parent a0b7cf6b6e
commit 3c4a4d0dcb
2 changed files with 13 additions and 1 deletions
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12
configure vendored
View File

@ -543,6 +543,13 @@ fi
: ${python=${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 $QEMU_CFLAGS"
@ -586,6 +593,8 @@ for opt do
;;
--host-cc=*) host_cc="$optarg"
;;
--objcc=*) objcc="$optarg"
;;
--make=*) make="$optarg"
;;
--install=*) install="$optarg"
@ -1028,6 +1037,7 @@ echo " --cross-prefix=PREFIX use PREFIX for compile tools [$cross_prefix]"
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 @@ fi
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 $LDFLAGS"
@ -3521,6 +3532,7 @@ echo "PYTHON=$python" >> $config_host_mak
echo "CC=$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

2
rules.mak
View File

@ -29,7 +29,7 @@ endif
$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," AS $(TARGET_DIR)$@")
%.o: %.m
$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," OBJC $(TARGET_DIR)$@")
$(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," OBJC $(TARGET_DIR)$@")
LINK = $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $(sort $(1)) $(LIBS)," LINK $(TARGET_DIR)$@")