[U-Boot] ld fails with .bss / .rel.dyn overlap for 2011.12

[Joey Oravec]

This email is to report a problem building u-boot 2011.12 with a gcc 
4.3.2 toolchain. I've added support locally for a marvell 78xx0 based 
board. It's using arm926ejs and I have not modified the *.lds linker script.

Case 1: With gcc 4.3.2 provided by marvell, the build fails with this error:

arm-mv5vfp-linux-gnueabi-ld: section .bss [00000000fffbba08 -> 
00000000fffc3137] overlaps section .rel.dyn [00000000fffbba08 -> 
00000000fffbeea7]
arm-mv5vfp-linux-gnueabi-ld: section .dynsym [00000000fffbeea8 -> 
00000000fffbef57] overlaps section .bss [00000000fffbba08 -> 
00000000fffc3137]
arm-mv5vfp-linux-gnueabi-ld: u-boot: section .bss lma 0xfffbba08 
overlaps previous sections
make: *** [u-boot] Error 1

Through trial-and-error, I found that this error only occurs when .bss 
is unaligned. In my example .bss is only 2-byte aligned and u-boot.map 
indicates that the linker added 2-bytes of zero fill at the end of bss. 
If I add a global unsigned short so .bss is 4-byte aligned the error 
goes away and gcc produces a good binary.

Case 2: With gcc 4.6.3 built with crosstool-ng, the build has no problem.

I can provide u-boot.map files (~70k) for each case.

-joey