Builds can not be compiled with the original AOSP GCC 4.4 toolchain

[Zach Pfeffer]

Builds can no longer be compiled with the original 4.4 toolchain. See https://android-build.linaro.org/builds/~pfefferz/staging-panda-gcc4.4/#build=2

[Zach Pfeffer (pfefferz)]

Will be done as part of https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-master-build-aosp-panda.

[Andy Doan (doanac)]

I hit this problem today playing with 4.4 toolchain benchmarks. I've found an easy way to reproduce the first bug I'm encountering:

tmp.cpp:
 int main() {return 0;}

Then run:
 prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-g++ -c -Werror -march=armv7-a -mcpu=cortex-a9 tmp.cpp

You'll get this error:
 cc1plus: warnings being treated as errors
 tmp.cpp:1: error: switch -mcpu=cortex-a9 conflicts with -march= switch

[Andy Doan (doanac)]

I've done a little more research into this. I think we can work around the issue I spotted in comment #2 with a change like this patch. The change basically makes sure the "-march" and "-mcpu/-mtune" options can co-exist with each other.

[Andy Doan (doanac)]

I'm getting closer. I just uncovered an issue compiling u-boot on panda. There's logic in devices/linaro/common/tasks/uboot.mk that picks the systems arm cross-compiler if the Google prebuilt toolchain is being used. According to the docs its too old.

The problem I hit was that GCC 4.6 hits an internal error. I switch to the GCC 4.5 cross-compiler and was able to work around that issue.

[Andy Doan (doanac)]

I've also hit issues with a symbol being defined twice in window.h/native_window.h. I'll attach a patch for this shortly.

[Andy Doan (doanac)]

this fixes a duplicate symbol error when using the google prebuilt toolchain

[Andy Doan (doanac)]

this is needed after the previous framework-base.patch is applied to pull in definitions for memset when C++ compiles are done.

[Andy Doan (doanac)]

This patch fixes an issue where the pre-built compiler doesn't support the "-mno-unligned-access" flag.