Re: [Qemu-devel] qemu Makefile configure

[Thiemo Seufer <ths@networkno.de>]

Fabrice Bellard wrote:
> IMHO, CFLAGS and LDFLAGS overriding should not be allowed for QEMU as it 
> is almost sure to break the dyngen stuff. If ever it is allowed, it 
> should be done so that the CFLAGS for the files used by dyngen are not 
> modified.

That's why I made OP_CFLAGS a separate set of flags.

I append the next version of the patch, which incorporates the
suggestions made by Daniel and Bernhard, and fixes a gcc3 detection
bug I introduced earlier.


Thiemo


Index: Makefile
===================================================================
RCS file: /sources/qemu/qemu/Makefile,v
retrieving revision 1.107
diff -u -p -r1.107 Makefile
--- Makefile	1 Jan 2007 21:31:01 -0000	1.107
+++ Makefile	3 Jan 2007 16:10:06 -0000
@@ -5,19 +5,15 @@ include config-host.mak
 .PHONY: all clean distclean dvi info install install-doc tar tarbin \
 	speed test test2 html dvi info
 
-CFLAGS+=-Wall -O2 -g -fno-strict-aliasing -I.
-ifdef CONFIG_DARWIN
-CFLAGS+= -mdynamic-no-pic
-endif
+override CFLAGS += $(OS_CFLAGS)
 ifeq ($(ARCH),sparc)
-CFLAGS+=-mcpu=ultrasparc
+override CFLAGS += -mcpu=ultrasparc
 endif
-LDFLAGS+=-g
+CPPFLAGS += -I. -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
 LIBS=
-DEFINES+=-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
 TOOLS=qemu-img$(EXESUF)
 ifdef CONFIG_STATIC
-LDFLAGS+=-static
+override LDFLAGS += -static
 endif
 ifdef BUILD_DOCS
 DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1
@@ -41,10 +37,10 @@ subdir-%: dyngen$(EXESUF)
 recurse-all: $(patsubst %,subdir-%, $(TARGET_DIRS))
 
 qemu-img$(EXESUF): qemu-img.c block.c block-raw.c block-cow.c block-qcow.c aes.c block-vmdk.c block-cloop.c block-dmg.c block-bochs.c block-vpc.c block-vvfat.c block-qcow2.c
-	$(CC) -DQEMU_TOOL $(CFLAGS) $(LDFLAGS) $(DEFINES) -o $@ $^ -lz $(LIBS)
+	$(CC) -DQEMU_TOOL $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $^ -lz $(LIBS)
 
 dyngen$(EXESUF): dyngen.c
-	$(HOST_CC) $(CFLAGS) $(DEFINES) -o $@ $^
+	$(HOST_CC) $(CFLAGS) $(CPPFLAGS) -o $@ $^
 
 clean:
 # avoid old build problems by removing potentially incorrect old files
Index: Makefile.target
===================================================================
RCS file: /sources/qemu/qemu/Makefile.target,v
retrieving revision 1.134
diff -u -p -r1.134 Makefile.target
--- Makefile.target	7 Dec 2006 18:15:35 -0000	1.134
+++ Makefile.target	3 Jan 2007 16:10:07 -0000
@@ -12,14 +12,12 @@ TARGET_BASE_ARCH:=sparc
 endif
 TARGET_PATH=$(SRC_PATH)/target-$(TARGET_BASE_ARCH)
 VPATH=$(SRC_PATH):$(TARGET_PATH):$(SRC_PATH)/hw:$(SRC_PATH)/audio
-DEFINES=-I. -I.. -I$(TARGET_PATH) -I$(SRC_PATH)
+CPPFLAGS=-I. -I.. -I$(TARGET_PATH) -I$(SRC_PATH)
 ifdef CONFIG_USER_ONLY
 VPATH+=:$(SRC_PATH)/linux-user
-DEFINES+=-I$(SRC_PATH)/linux-user -I$(SRC_PATH)/linux-user/$(TARGET_ARCH)
+CPPFLAGS+=-I$(SRC_PATH)/linux-user -I$(SRC_PATH)/linux-user/$(TARGET_ARCH)
 endif
-CFLAGS=-Wall -O2 -g -fno-strict-aliasing
 #CFLAGS+=-Werror
-LDFLAGS=-g
 LIBS=
 HELPER_CFLAGS=$(CFLAGS)
 DYNGEN=../dyngen$(EXESUF)
@@ -62,18 +60,20 @@ endif
 endif # !CONFIG_USER_ONLY
 
 ifdef CONFIG_STATIC
-LDFLAGS+=-static
+override LDFLAGS+=-static
 endif
 
+# We require -O2 to avoid the stack setup prologue in EXIT_TB
+OP_CFLAGS := -Wall -O2 -g -fno-strict-aliasing
+
 ifeq ($(ARCH),i386)
-HELPER_CFLAGS:=$(CFLAGS) -fomit-frame-pointer
-OP_CFLAGS:=$(CFLAGS) -mpreferred-stack-boundary=2 -fomit-frame-pointer
+HELPER_CFLAGS+=-fomit-frame-pointer
+override OP_CFLAGS+=-mpreferred-stack-boundary=2 -fomit-frame-pointer
 ifeq ($(HAVE_GCC3_OPTIONS),yes)
-OP_CFLAGS+= -falign-functions=0 -fno-gcse
+override OP_CFLAGS+= -falign-functions=0 -fno-gcse
 else
-OP_CFLAGS+= -malign-functions=0
+override OP_CFLAGS+= -malign-functions=0
 endif
-
 ifdef TARGET_GPROF
 USE_I386_LD=y
 endif
@@ -81,91 +81,92 @@ ifdef CONFIG_STATIC
 USE_I386_LD=y
 endif
 ifdef USE_I386_LD
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/i386.ld
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 else
 # WARNING: this LDFLAGS is _very_ tricky : qemu is an ELF shared object
 # that the kernel ELF loader considers as an executable. I think this
 # is the simplest way to make it self virtualizable!
-LDFLAGS+=-Wl,-shared
+override LDFLAGS+=-Wl,-shared
 endif
 endif
 
 ifeq ($(ARCH),x86_64)
-OP_CFLAGS=$(CFLAGS) -falign-functions=0
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/x86_64.ld
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(ARCH),ppc)
-CFLAGS+= -D__powerpc__
-OP_CFLAGS=$(CFLAGS)
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/ppc.ld
+CPPFLAGS+= -D__powerpc__
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(ARCH),s390)
-OP_CFLAGS=$(CFLAGS)
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/s390.ld
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(ARCH),sparc)
 ifeq ($(CONFIG_SOLARIS),yes)
-CFLAGS+=-mcpu=ultrasparc -m32 -ffixed-g2 -ffixed-g3
-LDFLAGS+=-m32
-OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -fno-omit-frame-pointer -ffixed-i0
+override CFLAGS+=-mcpu=ultrasparc -m32 -ffixed-g2 -ffixed-g3
+override LDFLAGS+=-m32
+override OP_CFLAGS+=-fno-delayed-branch -fno-omit-frame-pointer -ffixed-i0
 else
-CFLAGS+=-mcpu=ultrasparc -m32 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
-LDFLAGS+=-m32
-OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -ffixed-i0
+override CFLAGS+=-mcpu=ultrasparc -m32 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
+override LDFLAGS+=-m32
+override OP_CFLAGS+=-fno-delayed-branch -ffixed-i0
 HELPER_CFLAGS=$(CFLAGS) -ffixed-i0 -mflat
 # -static is used to avoid g1/g3 usage by the dynamic linker
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/sparc.ld -static
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld -static
 endif
 endif
 
 ifeq ($(ARCH),sparc64)
-CFLAGS+=-mcpu=ultrasparc -m64 -ffixed-g1 -ffixed-g4 -ffixed-g5 -ffixed-g7
-LDFLAGS+=-m64
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/sparc64.ld
-OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -ffixed-i0
+override CFLAGS+=-mcpu=ultrasparc -m64 -ffixed-g1 -ffixed-g4 -ffixed-g5 -ffixed-g7
+override LDFLAGS+=-m64
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
+override OP_CFLAGS+=-mcpu=ultrasparc -m64 -ffixed-g1 -ffixed-g4 -ffixed-g5 -ffixed-g7 -fno-delayed-branch -ffixed-i0
 endif
 
 ifeq ($(ARCH),alpha)
-# -msmall-data is not used because we want two-instruction relocations
-# for the constant constructions
-OP_CFLAGS=-Wall -O2 -g
+# -msmall-data is not used for OP_CFLAGS because we want two-instruction
+# relocations for the constant constructions
 # Ensure there's only a single GP
-CFLAGS += -msmall-data
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/alpha.ld
+override CFLAGS+=-msmall-data
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(ARCH),ia64)
-CFLAGS += -mno-sdata
-OP_CFLAGS=$(CFLAGS)
-LDFLAGS+=-Wl,-G0 -Wl,-T,$(SRC_PATH)/ia64.ld
+override CFLAGS+=-mno-sdata
+override OP_CFLAGS+=-mno-sdata
+override LDFLAGS+=-Wl,-G0 -Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(ARCH),arm)
-OP_CFLAGS=$(CFLAGS) -mno-sched-prolog -fno-omit-frame-pointer
-LDFLAGS+=-Wl,-T,$(SRC_PATH)/arm.ld
+override OP_CFLAGS+=-mno-sched-prolog -fno-omit-frame-pointer
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(ARCH),m68k)
-OP_CFLAGS=$(CFLAGS) -fomit-frame-pointer
-LDFLAGS+=-Wl,-T,m68k.ld
+override OP_CFLAGS+=-fomit-frame-pointer
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
+endif
+
+ifeq ($(ARCH),mips)
+override LDFLAGS+=-Wl,-T,$(SRC_PATH)/$(ARCH).ld
 endif
 
 ifeq ($(HAVE_GCC3_OPTIONS),yes)
 # very important to generate a return at the end of every operation
-OP_CFLAGS+=-fno-reorder-blocks -fno-optimize-sibling-calls
+override OP_CFLAGS+=-fno-reorder-blocks -fno-optimize-sibling-calls
 endif
 
 ifeq ($(CONFIG_DARWIN),yes)
-OP_CFLAGS+= -mdynamic-no-pic
 LIBS+=-lmx
 endif
 
+override OP_CFLAGS+=$(OS_CFLAGS)
+
 #########################################################
 
-DEFINES+=-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+CPPFLAGS+=-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
 LIBS+=-lm
 ifndef CONFIG_USER_ONLY
 LIBS+=-lz
@@ -179,8 +180,8 @@ endif
 
 # profiling code
 ifdef TARGET_GPROF
-LDFLAGS+=-p
-main.o: CFLAGS+=-p
+override LDFLAGS+=-p
+main.o: override CFLAGS+=-p
 endif
 
 OBJS= main.o syscall.o mmap.o signal.o path.o osdep.o thunk.o \
@@ -211,7 +212,7 @@ LIBOBJS+=fpu/softfloat.o
 else
 LIBOBJS+=fpu/softfloat-native.o
 endif
-DEFINES+=-I$(SRC_PATH)/fpu
+CPPFLAGS+=-I$(SRC_PATH)/fpu
 
 ifeq ($(TARGET_ARCH), i386)
 LIBOBJS+=helper.o helper2.o
@@ -324,7 +325,7 @@ LIBS += -lole32 -ldxguid
 endif
 ifdef CONFIG_FMOD
 AUDIODRV += fmodaudio.o
-audio.o fmodaudio.o: DEFINES := -I$(CONFIG_FMOD_INC) $(DEFINES)
+audio.o fmodaudio.o: CPPFLAGS := -I$(CONFIG_FMOD_INC) $(CPPFLAGS)
 LIBS += $(CONFIG_FMOD_LIB)
 endif
 ifdef CONFIG_ADLIB
@@ -347,14 +348,14 @@ VL_OBJS+= ide.o pckbd.o ps2.o vga.o $(SO
 VL_OBJS+= fdc.o mc146818rtc.o serial.o i8259.o i8254.o pcspk.o pc.o
 VL_OBJS+= cirrus_vga.o mixeng.o apic.o parallel.o acpi.o piix_pci.o
 VL_OBJS+= usb-uhci.o
-DEFINES += -DHAS_AUDIO
+CPPFLAGS += -DHAS_AUDIO
 endif
 ifeq ($(TARGET_BASE_ARCH), ppc)
 VL_OBJS+= ppc.o ide.o pckbd.o ps2.o vga.o $(SOUND_HW) dma.o $(AUDIODRV)
 VL_OBJS+= mc146818rtc.o serial.o i8259.o i8254.o fdc.o m48t59.o
 VL_OBJS+= ppc_prep.o ppc_chrp.o cuda.o adb.o openpic.o heathrow_pic.o mixeng.o
 VL_OBJS+= grackle_pci.o prep_pci.o unin_pci.o
-DEFINES += -DHAS_AUDIO
+CPPFLAGS += -DHAS_AUDIO
 endif
 ifeq ($(TARGET_ARCH), mips)
 VL_OBJS+= mips_r4k.o mips_timer.o dma.o vga.o serial.o i8254.o i8259.o ide.o
@@ -395,7 +396,7 @@ COCOA_LIBS+=-framework CoreAudio
 endif
 endif
 ifdef CONFIG_SLIRP
-DEFINES+=-I$(SRC_PATH)/slirp
+CPPFLAGS+=-I$(SRC_PATH)/slirp
 SLIRP_OBJS=cksum.o if.o ip_icmp.o ip_input.o ip_output.o \
 slirp.o mbuf.o misc.o sbuf.o socket.o tcp_input.o tcp_output.o \
 tcp_subr.o tcp_timer.o udp.o bootp.o debug.o tftp.o
@@ -418,7 +419,7 @@ endif
 endif
 endif
 ifdef TARGET_GPROF
-vl.o: CFLAGS+=-p
+vl.o: override CFLAGS+=-p
 VL_LDFLAGS+=-p
 endif
 
@@ -439,22 +440,22 @@ $(QEMU_SYSTEM): $(VL_OBJS) libqemu.a
 	$(CC) $(VL_LDFLAGS) -o $@ $^ $(LIBS) $(SDL_LIBS) $(COCOA_LIBS) $(VL_LIBS)
 
 cocoa.o: cocoa.m
-	$(CC) $(CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 sdl.o: sdl.c keymaps.c sdl_keysym.h
-	$(CC) $(CFLAGS) $(DEFINES) $(SDL_CFLAGS) -c -o $@ $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(SDL_CFLAGS) -c -o $@ $<
 
 vnc.o: vnc.c keymaps.c sdl_keysym.h vnchextile.h
-	$(CC) $(CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 sdlaudio.o: sdlaudio.c
-	$(CC) $(CFLAGS) $(DEFINES) $(SDL_CFLAGS) -c -o $@ $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(SDL_CFLAGS) -c -o $@ $<
 
 depend: $(SRCS)
-	$(CC) -MM $(CFLAGS) $(DEFINES) $^ 1>.depend
+	$(CC) -MM $(CFLAGS) $(CPPFLAGS) $^ 1>.depend
 
 vldepend: $(VL_OBJS:.o=.c)
-	$(CC) -MM $(CFLAGS) $(DEFINES) $^ 1>.depend
+	$(CC) -MM $(CFLAGS) $(CPPFLAGS) $^ 1>.depend
 
 # libqemu 
 
@@ -478,26 +479,26 @@ gen-op.h: op.o $(DYNGEN)
 	$(DYNGEN) -g -o $@ $<
 
 op.o: op.c
-	$(CC) $(OP_CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(OP_CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 # HELPER_CFLAGS is used for all the code compiled with static register
 # variables
 ifeq ($(TARGET_BASE_ARCH), i386)
 # XXX: rename helper.c to op_helper.c
 helper.o: helper.c
-	$(CC) $(HELPER_CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) -c -o $@ $<
 else
 op_helper.o: op_helper.c
-	$(CC) $(HELPER_CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) -c -o $@ $<
 endif
 
 cpu-exec.o: cpu-exec.c
-	$(CC) $(HELPER_CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 # Note: this is a workaround. The real fix is to avoid compiling
 # cpu_signal_handler() in cpu-exec.c.
 signal.o: signal.c
-	$(CC) $(HELPER_CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 ifeq ($(TARGET_BASE_ARCH), i386)
 op.o: op.c opreg_template.h ops_template.h ops_template_mem.h ops_mem.h ops_sse.h
@@ -539,10 +540,10 @@ endif
 $(OBJS) $(LIBOBJS) $(VL_OBJS): config.h ../config-host.h
 
 %.o: %.c
-	$(CC) $(CFLAGS) $(DEFINES) -c -o $@ $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 %.o: %.S
-	$(CC) $(DEFINES) -c -o $@ $<
+	$(CC) $(CPPFLAGS) -c -o $@ $<
 
 clean:
 	rm -f *.o  *.a *~ $(PROGS) gen-op.h opc.h op.h nwfpe/*.o slirp/*.o fpu/*.o
Index: configure
===================================================================
RCS file: /sources/qemu/qemu/configure,v
retrieving revision 1.115
diff -u -p -r1.115 configure
--- configure	1 Jan 2007 21:31:01 -0000	1.115
+++ configure	3 Jan 2007 16:10:07 -0000
@@ -103,7 +103,7 @@ targetos=`uname -s`
 case $targetos in
 CYGWIN*)
 mingw32="yes"
-CFLAGS="-O2 -mno-cygwin"
+OS_CFLAGS="-mno-cygwin"
 ;;
 MINGW32*)
 mingw32="yes"
@@ -126,6 +126,7 @@ oss="yes"
 Darwin)
 bsd="yes"
 darwin="yes"
+OS_CFLAGS="-mdynamic-no-pic"
 ;;
 SunOS)
 solaris="yes"
@@ -243,6 +244,10 @@ for opt do
   esac
 done
 
+# default flags for all hosts
+CFLAGS="$CFLAGS -Wall -O2 -g -fno-strict-aliasing"
+LDFLAGS="$LDFLAGS -g"
+
 if test x"$show_help" = x"yes" ; then
 cat << EOF
 
@@ -605,6 +610,7 @@ fi
 echo "HOST_CC=$host_cc" >> $config_mak
 echo "AR=$ar" >> $config_mak
 echo "STRIP=$strip -s -R .comment -R .note" >> $config_mak
+echo "OS_CFLAGS=$OS_CFLAGS" >> $config_mak
 echo "CFLAGS=$CFLAGS" >> $config_mak
 echo "LDFLAGS=$LDFLAGS" >> $config_mak
 echo "EXESUF=$EXESUF" >> $config_mak