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Misaligned .bss section for PE?


Hi there,

Recently I met a crash on MinGW32 caused by misaligned access of SSE instructions. The root cause was that a static var wasn't aligned to a 16-byte boundary. However, in gcc source this var had already been marked with "__attribute__((aligned(16)))".

I then checked the output of "gcc -S" and it turned out that with PE you couldn't specify a symbol's alignment. Rather, the alignment was ensured by explicit padding. But gcc seemed to do it right, at least within a compilation unit. Unfortunately, after hundreds of objects got linked together, some symbols' alignment was broken.

I'm just wondering if I should report it as a GCC bug or a binutils one. Any help? Thanks!

--
Zuxy




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