Goal
I would like to be able to cross-compile v8 using bitbake.
If you're interested in building it natively on a Gumstix Overo, that's done. Google my first post about node.JS on OpenEmbedded.
bitbake libv8
opkg install libv8
Current Status
scons doesn't use environment variables, so trying to get it working "the scons way" TM seems a lost cause, but I'll check on the scons, v8, and bitbake mailing list with my proposed method to be sure.
However, with a little Makefile magic I can get it to compile well enough it seems.
${OVEROTOP}/user.collection/recipes/libv8/libv8_r5266.bb
DESCRIPTION = "V8 JavaScript Engine"
PR = "r0"
DEPENDS = ""
SRC_URI = " \
svn://v8.googlecode.com/svn;module=trunk;proto=http;rev=5266 \
file://overo-opts.patch \
file://Makefile \
"
S = "${WORKDIR}/trunk"
FILES_${PN} = "${bindir}/libv8"
do_install() {
# install the lib somewhere?
}
#inherit scons # doesn't currently provide meaningful setup
${OVEROTOP}/user.collection/recipes/libv8/files/Makefile
all:
CC=`which ${CC}` CXX=`which ${CXX}` AR=`which ${AR}` RANLIB=`which ${RANLIB}` scons arch=arm
.PHONY: all
${OVEROTOP}/user.collection/recipes/libv8/files/overo-opts.patch
diff --git trunk/SConstruct.orig trunk/SConstruct
index 0abaeed..b85262a 100644
--- trunk/SConstruct.orig
+++ trunk/SConstruct
@@ -42,6 +42,13 @@ ANDROID_TOP = os.environ.get('TOP')
if ANDROID_TOP is None:
ANDROID_TOP=""
+# OVERO_TOP is the top of the Overo checkout, fetched from the environment
+# variable 'OVERO_TOP'. You will also need to set the CXX, CC, AR and RANLIB
+# environment variables to the cross-compiling tools.
+OVERO_TOP = os.environ.get('OVEROTOP')
+if OVERO_TOP is None:
+ OVERO_TOP=""
+
# ARM_TARGET_LIB is the path to the dynamic library to use on the target
# machine if cross-compiling to an arm machine. You will also need to set
# the additional cross-compiling environment variables to the cross compiler.
@@ -108,6 +115,9 @@ ANDROID_LINKFLAGS = ['-nostdlib',
ANDROID_TOP + '/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/lib/gcc/arm-eabi/4.4.0/interwork/libgcc.a',
ANDROID_TOP + '/out/target/product/generic/obj/lib/crtend_android.o'];
+OVERO_FLAGS = ANDROID_FLAGS # Verizon Droids are armv7-a cortex-a8, I suppose that should be similar enough
+OVERO_INCLUDES = "" # TODO
+
LIBRARY_FLAGS = {
'all': {
'CPPPATH': [join(root_dir, 'src')],
@@ -197,6 +207,14 @@ LIBRARY_FLAGS = {
'-Wstrict-aliasing=2'],
'CPPPATH': ANDROID_INCLUDES,
},
+ 'os:overo': {
+ 'CPPDEFINES': ['V8_TARGET_ARCH_ARM', '__ARM_ARCH_5__', '__ARM_ARCH_5T__',
+ '__ARM_ARCH_5E__', '__ARM_ARCH_5TE__'],
+ 'CCFLAGS': OVERO_FLAGS,
+ 'WARNINGFLAGS': ['-Wall', '-Wno-unused', '-Werror=return-type',
+ '-Wstrict-aliasing=2'],
+ 'CPPPATH': OVERO_INCLUDES,
+ },
'arch:ia32': {
'CPPDEFINES': ['V8_TARGET_ARCH_IA32'],
'CCFLAGS': ['-m32'],
@@ -204,6 +222,8 @@ LIBRARY_FLAGS = {
},
'arch:arm': {
'CPPDEFINES': ['V8_TARGET_ARCH_ARM'],
+ 'CCFLAGS': OVERO_FLAGS,
+ 'CPPPATH': OVERO_INCLUDES,
'unalignedaccesses:on' : {
'CPPDEFINES' : ['CAN_USE_UNALIGNED_ACCESSES=1']
},
@@ -673,7 +693,7 @@ SIMPLE_OPTIONS = {
'help': 'the toolchain to use (' + TOOLCHAIN_GUESS + ')'
},
'os': {
- 'values': ['freebsd', 'linux', 'macos', 'win32', 'android', 'openbsd', 'solaris'],
+ 'values': ['freebsd', 'linux', 'macos', 'win32', 'android', 'openbsd', 'overo', 'solaris'],
'default': OS_GUESS,
'help': 'the os to build for (' + OS_GUESS + ')'
},
Manual Cross-Compile
Here's a way to cross-compile without any patches or fully using bitbake:
bitbake v8
# fails, of course
cd ${OVEROTOP}/tmp/work/armv7a-angstrom-linux-gnueabi/libv8-r5266-r0/trunk
USER=my-user-name \
CROSS_DIR=/home/${USER}/overo-oe/tmp/cross/armv7a/bin \
CC="${CROSS_DIR}/arm-angstrom-linux-gnueabi-gcc -march=armv7-a -mtune=cortex-a8" \
CXX="${CROSS_DIR}/arm-angstrom-linux-gnueabi-g++ -march=armv7-a -mtune=cortex-a8" \
scons arch=arm
Or without bitbake at all (you could even use your trusty arm-none-linux-gnueabi-xyz):
cd ~/
svn checkout svn://v8.googlecode.com/svn v8-read-only
cd v8-read-only
USER=my-user-name \
CROSS_DIR=/home/${USER}/overo-oe/tmp/cross/armv7a/bin \
CROSS_COMPILE=${CROSS_DIR}/arm-angstrom-linux-gnueabi- \
CC="${CROSS_COMPILE}gcc -march=armv7-a -mtune=cortex-a8" \
CXX="${CROSS_COMPILE}g++ -march=armv7-a -mtune=cortex-a8" \
scons arch=arm
And how to add an OS
cd
git diff --no-prefix SConstruct.orig SConstruct > overo-opts.patch
TODO
Figure out which of these to use and which not to in SConstruct
I'm guessing I should set the LDFLAGS all the same for the overo libs, but leave the android optimized CFLAGS
BUILD_CFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/include -O2 -g'
BUILD_CPPFLAGS=-isystem/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/include
BUILD_CXXFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/include -O2 -g -fpermissive'
BUILD_LDFLAGS='-L/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/lib -Wl,-rpath-link,/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/lib -Wl,-rpath,/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/lib -Wl,-O1'
CFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3'
CPPFLAGS=-isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include
CXXFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3 -fpermissive -fvisibility-inlines-hidden'
EXTRA_OEMAKE=' -e MAKEFLAGS='
LDFLAGS='-L/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/lib -Wl,-rpath-link,/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/lib -Wl,-O1 -Wl,--hash-style=gnu'
SDK_CFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/include -isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3'
SDK_CPPFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/include -isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include'
SDK_CXXFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/include -isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3 -fpermissive'
SDK_LDFLAGS='-L/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/lib -Wl,-rpath-link,/home/${USER}/overo-oe/tmp/sysroots/i686-linux/usr/lib -Wl,-O1'
TARGET_CFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3'
TARGET_CPPFLAGS=-isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include
TARGET_CXXFLAGS='-isystem/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/include -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3 -fpermissive'
TARGET_LDFLAGS='-L/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/lib -Wl,-rpath-link,/home/${USER}/overo-oe/tmp/sysroots/armv7a-angstrom-linux-gnueabi/usr/lib -Wl,-O1 -Wl,--hash-style=gnu'