Modifications to allow compiling 32-bit binaries on 64-bit machines

(x86) and vice-versa.

kernel/Mk/Makeconf

@@ -1,7 +1,7 @@
 ## -*- mode: Makefile; -*-
 ######################################################################
 ##                
-## Copyright (C) 2001-2009,  Karlsruhe University
+## Copyright (C) 2001-2009, 2011,  Karlsruhe University
 ##                
 ## File path:     Mk/Makeconf
 ## Description:   Make settings for pistachio
@@ -82,15 +82,25 @@ endif
 
 # If CC was not given by user, default to GCC for target architecture
 ifeq "$(origin CC)" "default"
-CC=		$(CCACHE) $(TOOLPREFIX)gcc
+CC=		$(CCACHE) $(TOOLPREFIX)gcc 
 endif
 CC_VERSION	= $(shell echo __GNUC__ | $(CC) -E  - | grep -v "\#")
 CC_SUBVERSION	= $(shell echo __GNUC_MINOR__ | $(CC) -E  - | grep -v "\#")
 
 
-GCCINSTALLDIR?= $(dir $(shell $(CC) -print-libgcc-file-name))
-LIBGCCINC?= $(GCCINSTALLDIR)include
-LIBGCCDIR?= $(GCCINSTALLDIR)
+######################################################################
+#
+# Hardware specific options
+#
+# Known so far: CFLAGS_<arch>, CFLAGS_<cpu>, CFLAGS_<platform>
+#               ASMFLAGS_<arch> ASMFLAGS_<cpu>, ASMFLAGS_<platform>
+#		DEFINES_<arch>
+
+-include $(SRCDIR)/Mk/Makeconf.$(ARCH)
+
+
+LIBGCCDIR?= $(dir $(shell $(CC) $(CFLAGS) -print-libgcc-file-name))
+LIBGCCINC?= $(dir $(shell $(CC) $(CFLAGS) -print-file-name=include/stdarg.h))
 
 # Some CCs (e.g., the native FreeBSD gcc) do not follow the regular
 # gcc conventions when it comes to the gcc include files.
@@ -120,15 +130,6 @@ ifeq "$(SCHED)" ""
 SCHED=	rr
 endif
 
-######################################################################
-#
-# Hardware specific options
-#
-# Known so far: CFLAGS_<arch>, CFLAGS_<cpu>, CFLAGS_<platform>
-#               ASMFLAGS_<arch> ASMFLAGS_<cpu>, ASMFLAGS_<platform>
-#		DEFINES_<arch>
-
--include $(SRCDIR)/Mk/Makeconf.$(ARCH)
 
 
 # these macros will be undefined first - they may have default values

kernel/Mk/Makeconf.x86

@@ -1,6 +1,6 @@
 ################ -*- mode: Makefile; -*- #############################
 ##
-## Copyright (C) 2007-2008, 2010,  Karlsruhe University
+## Copyright (C) 2007-2008, 2010-2011,  Karlsruhe University
 ##
 ## File path:     Mk/Makeconf.x86
 ##
@@ -37,15 +37,18 @@ endif
 UNDEFS	 += $(SUBARCH)
 DEFINES	 += __SUBARCH__=$(SUBARCH)
 
-CFLAGS_x86_x32	+= -O2 -mpreferred-stack-boundary=2 
+CFLAGS_x86_x32	+= -O2 -m32 -mpreferred-stack-boundary=2 
 CFLAGS_x86_x64  += -O2 -m64 -mcmodel=kernel -mno-red-zone 
 CFLAGS_x86	+= $(CFLAGS_x86_$(SUBARCH)) -mno-mmx -mno-sse -mno-sse2 -mno-sse3
+LDFLAGS_x86_x32	+= -melf_i386
 LDFLAGS_x86_x64	+= -melf_x86_64 -n -z max-page-size=4096
 LDFLAGS_x86	+= $(LDFLAGS_x86_$(SUBARCH))
 
+ASMFLAGS_x86_x32 += -m32
 ASMFLAGS_x86_x64 += -m64 
 ASMFLAGS_x86	 += $(ASMFLAGS_x86_$(SUBARCH))
 
+VFLAGS_x86_x32	 = -m elf_i386
 VFLAGS_x86_x64	 = -m elf_x86_64
 VFLAGS		 += $(VFLAGS_x86_$(SUBARCH))
 

user/configure.in

@@ -62,6 +62,7 @@ case $HOST in
   ia32|x86|i386*|i486*|i586*|i686*)
 	ARCH=ia32
 	KERNEL=x86-kernel
+	LIBGCCFLAGS=-m32
 	;;
   powerpc64*|ppc64*)
 	ARCH=powerpc64
@@ -71,7 +72,7 @@ case $HOST in
 	ARCH=powerpc
 	KERNEL=$ARCH-kernel
 	;;
-  amd64*)
+  amd64*|x86_64*)
 	ARCH=amd64
 	KERNEL=x86-kernel
 	LIBGCCFLAGS=-m64
@@ -288,7 +289,13 @@ case $ARCH in
 esac
 
 dnl Platform dependent settings.
-case $HOST in
+case $ARCH in
+  ia32*)
+	PLAT=amd64-pc99
+	CFLAGS="$CFLAGS -m32"
+	LDFLAGS="$LDFLAGS -melf_i386"
+	AC_SUBST([PLAT])
+	;;
   amd64*)
 	PLAT=amd64-pc99
 	CFLAGS="$CFLAGS -m64 -mno-red-zone"