Here is the reply from google developer, who think this is a race condition: "The Android build system isn't designed to use recursive calls to make, and the result in that case is subject to race conditions and therefore very undefined.
You can try to build without -j, you can try to add the pseudo-target "showcommands" to your command line, but the real debugging is likely to be in the makefiles you're invoking recursively, not in the Android build system."
But I have encontered this problem sometimes.
On Mon, Jul 15, 2013 at 1:22 PM, Yingchun Li sword.l.dragon@gmail.comwrote:
I have ported u-boot to my android4.2 source and use the android toolchain, which has a gcc version 4.6.x-google 20120106. my envisionment for build: ubuntu 10.04, with a host gcc version 4.4.3. my platform is arm-v7, cotex-a5. the problem is that some times u-boot will encounter the following compile error(I use a 'make -j32' for building android):
target thumb C++: libGLES_trace <= frameworks/native/opengl/libs/GLES_trace/src/gltrace_context.cpp CC ispi.c target thumb C++: libGLES_trace <= frameworks/native/opengl/libs/GLES_trace/src/gltrace_egl.cpp CC spl.c target thumb C++: libGLES_trace <= frameworks/native/opengl/libs/GLES_trace/src/gltrace_eglapi.cpp
MAKE arch/arm/lib/ CC timer.c cc1: error: unrecognized command line option '-mshort-load-bytes' make[2]: *** [/home/jenkins/workspace/droid-4.2.2_r1/out/target/product/aere/obj/u-boot/arch/arm/cpu/armv7/rda/timer.o] Error 1 make[1]: *** [/home/jenkins/workspace/droid-4.2.2_r1/out/target/product/aere/obj/u-boot/arch/arm/cpu/armv7/rda/librda.o] Error 2 make[1]: Leaving directory `/home/jenkins/workspace/rdadroid-4.2.2_r1/u-boot' make: *** [out/target/product/aere/obj/u-boot/u-boot.img] Error 2 make: *** Waiting for unfinished jobs....
but if I build it again, the compile error disappeared。
I know the gcc after 3.5 don't support option -mshort-load-bytes, but my gcc-version is 4.6, and I checked include/generated/cc_options.mk, if build fail, the content is: "CC_OPTIONS += -marm CC_OPTIONS += -mno-thumb-interwork CC_OPTIONS += -mabi=apcs-gnu CC_OPTIONS += -mabi=aapcs-linux CC_OPTIONS += -march=armv7-a CC_OPTIONS += -fno-stack-protector CC_OPTIONS += -Wno-format-nonliteral CC_OPTIONS += -Wno-format-security CC_OPTIONS += -fstack-usage CC_OPTIONS += -fno-toplevel-reorder CC_OPTIONS += -mshort-load-bytes " if success, there is no "CC_OPTIONS += -mshort-load-bytes". so, anyone can tell me how to debug this problems? thank you!