Hi Michael, Yes, the sdk forces thumb under the covers. All of the objects provided with the sdk are built with thumb. Thanks, Jerry Michael Marcin wrote:
Jerry Napoli wrote:
I'm trying to compile using boost 1_36_0 for ARMv6 Thumb for iPhone development. The compiler used is gcc 4.0.x supplied with the iphone sdk.
I run into issues with the inline assembly inside boost/detail/spinlock_gcc_arm.hpp. It generates a SWP instruction which (AFAIK) is not supported in thumb mode. The gnu arm assembler gives me a 'bad instruction ...' error. I'm able to work around it by modifying spinlock.hpp to include spinlock_sp.hpp instead. But has anyone addressed spinlock support for armv6 thumb?
Sorry this is not an answer but why are you using thumb? Does the iphone sdk force it?
While working on armv5 cell phone projects I found that in practice arm was smaller and faster than thumb because many arm instructions took more than 2 thumb instructions to emulate.
Thanks,
Michael Marcin
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