Build System differences Gingerbread -> ICS/JB

[Nathaniel Husted]

I'm currently building a piece of software in to a general AOSP image.
The project itself is located in <buildroot>/external. The project
compiles without error in ICS and JellyBean on both x86 and ARM (both
general, and maguro). However, when I try to compile the exact same
project in Gingerbread, I get the following compile error:


prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/bin/ld:
out/target/product/generic/obj/EXECUTABLES/projectname_intermediates/src/ev.o:
in function evpipe_write:external/projectname/src/ev.c:1842: error:
undefined reference to '__sync_synchronize'
collect2: ld returned 1 exit status

__sync_synchronize is a built-int intrinsic GCC function so there
should be absolutely no problems finding it. Why does LD have issues
finding this in Gingerbread but not ICS/JellyBean? What changes were
made to the build system? Does anyone know a workaround? I tried
setting TARGET_TOOLS_PREFIX to the tools used with JellyBean but had
no luck.

Cheers,
Nathaniel