Allow easy libpayload compilation using xcompile.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5465 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/Makefile

@@ -49,7 +49,10 @@ ifneq ($(V),1)
 Q := @
 endif
 
-CC = gcc
+$(if $(wildcard .xcompile),,$(eval $(shell bash util/xcompile/xcompile > .xcompile)))
+include .xcompile
+
+CC ?= gcc
 HOSTCC = gcc
 HOSTCXX = g++
 HOSTCFLAGS := -I$(srck) -I$(objk) -pipe

payloads/libpayload/util/xcompile/xcompile

@@ -0,0 +1,103 @@
+#!/bin/sh
+#
+# This file is part of the coreboot project.
+#
+# Copyright (C) 2007-2010 coresystems GmbH
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+testcc()
+{
+	echo "_start(void) {}" > .$$$$.c
+	$1 -nostdlib $2 .$$$$.c -o .$$$$.tmp 2>/dev/null >/dev/null
+	ret=$?
+	rm -f .$$$$.c .$$$$.tmp
+	return $ret
+}
+
+for make in make gmake gnumake; do
+	if [ "`$make --version 2>/dev/null | grep -c GNU`" -gt 0 ]; then
+		MAKE=$make
+		break
+	fi
+done
+
+GCCPREFIX=invalid
+TMPFILE=`mktemp /tmp/temp.XXXX 2>/dev/null || echo /tmp/temp.78gOIUGz`
+touch $TMPFILE
+
+# This should be a loop over all supported architectures
+TARCH=i386
+TWIDTH=32
+for gccprefixes in `pwd`/util/crossgcc/xgcc/bin/${TARCH}-elf- ${TARCH}-elf- ""; do
+	if ! which ${gccprefixes}as 2>/dev/null >/dev/null; then
+		continue
+	fi
+	rm -f ${TMPFILE}.o
+	if ${gccprefixes}as -o ${TMPFILE}.o ${TMPFILE}; then
+		TYPE=`${gccprefixes}objdump -p ${TMPFILE}.o`
+		if [ ${TYPE##* } == "elf${TWIDTH}-${TARCH}" ]; then
+			GCCPREFIX=$gccprefixes
+			ASFLAGS=
+			CFLAGS=
+			LDFLAGS=
+			break
+		fi
+	fi
+	if ${gccprefixes}as --32 -o ${TMPFILE}.o ${TMPFILE}; then
+		TYPE=`${gccprefixes}objdump -p ${TMPFILE}.o`
+		if [ ${TYPE##* } == "elf${TWIDTH}-${TARCH}" ]; then
+			GCCPREFIX=$gccprefixes
+			ASFLAGS=--32
+			CFLAGS="-m32 "
+			LDFLAGS="-b elf32-i386"
+			break
+		fi
+	fi
+done
+rm -f $TMPFILE ${TMPFILE}.o
+
+if [ "$GCCPREFIX" = "invalid" ]; then
+	echo '$(error no suitable gcc found)'
+	exit 1
+fi
+
+CC="${GCCPREFIX}gcc"
+testcc "$CC" "$CFLAGS-Wa,--divide " && CFLAGS="$CFLAGS-Wa,--divide "
+testcc "$CC" "$CFLAGS-fno-stack-protector " && CFLAGS="$CFLAGS-fno-stack-protector "
+testcc "$CC" "$CFLAGS-Wl,--build-id=none " && CFLAGS="$CFLAGS-Wl,--build-id=none "
+
+if which gcc 2>/dev/null >/dev/null; then
+	HOSTCC=gcc
+else
+	HOSTCC=cc
+fi
+
+cat << EOF
+# elf${TWIDTH}-${TARCH} toolchain
+AS:=${GCCPREFIX}as ${ASFLAGS}
+CC:=${GCCPREFIX}gcc ${CFLAGS}
+CPP:=${GCCPREFIX}cpp
+AR:=${GCCPREFIX}ar
+LD:=${GCCPREFIX}ld ${LDFLAGS}
+STRIP:=${GCCPREFIX}strip
+NM:=${GCCPREFIX}nm
+OBJCOPY:=${GCCPREFIX}objcopy
+OBJDUMP:=${GCCPREFIX}objdump
+
+# native toolchain
+HOSTCC:=${HOSTCC}
+EOF
+