为树莓派交叉编译Google v8库

Question

I am having a problem with cross compiling google v8 libraries for raspberry pi, and constantly getting "Illegal instruction" error when compiling official sample from site. These are the steps i followed:

1. Downloaded cross compile https://github.com/raspberrypi/tools/
2. Cloned v8 git https://chromium.googlesource.com/v8/v8.git
3. Exported CXX LINK point to arm-linux-gnueabihf-g++ from cross compile tools.
4. run make arm.release armv7=false hardfp=on snapshot=off armfpu=vfp armfloatabi=hard -j5
5. Copied generated executable shell and d8 from out/arm.release directory to pi (Raspbian kernel version 3.6.11) and it WORKS. These steps prove that cross compilation toolchain is functional.

Problem occurs when trying to run other cross-compiled software that is linked to v8 libraries. For example sample code from https://developers.google.com/v8/get_started#intro . Code is cross-compiled with this command (same as example, just changed compiler)

arm-linux-gnueabihf-g++ -I. hello_world.cc -o hello_world -Wl,--start-group out/x64.release/obj.target/{tools/gyp/libv8_{base,libbase,snapshot,libplatform},third_party/icu/libicu{uc,i18n,data}}.a -Wl,--end-group -lrt -pthread

When i copy that code to pi and run it i get SIGILL (Illegal instruction).

Note: cross compiled software that doesn't use v8 libraries works fine. Also x64 v8 libraries on host computer work fine.

On newer kernel versions shell and d8 were also throwing SIGILL but than i switched to older version 3.6.11 (problems with newer kernel https://groups.google.com/forum/#!topic/v8-users/IPT9EeYK9bg ) and they started working, but compiled sample code is still showed same issues.

Did anyone have similar experience? Any suggestion on how to overcome this problem?

Answer 1

I found a solution thanks to post on v8 google group. https://groups.google.com/forum/#!topic/v8-users/LTppUbqNrzI

Problem was in make arguments it should be.

make arm arm_version=6 armfpu=vfp armfloatabi=hard