On Sun, Dec 17, 2017 at 02:33:03PM +0000, Ghislain Vaillant wrote: > ISMRMRD uses a non-portable instruction (#pragma pack) which modifies the > memory alignment of its data structures. It seems neither armhf nor sparc64 > supports it, hence the failure of the test suite for both architectures.
#pragma pack is supported everywhere, and this pragma is the cause of the FTBFS. > I am not sure what the best course of action is. Either leaving things as is > assuming a future rebuild with a newer compiler could improve it, disabling > the tests or even dropping the packages for the failing architectures. > > Opinions welcome. With #pragma pack you are forcing the compiler to do the wrong thing, the only thing a newer compiler could possibly improve would be to error on such code. Unaligned floating point access on armhf is expected to fail, and that's exactly what happens here: unknown location(0): fatal error: in "AcquisitionsTest/test_acquisition_header": memory access violation at address: 0xbecd3b6a: invalid address alignment Running the test in gdb confirms that this is floating point code. sparc is generally unhappy with unaligned access: unknown location(0): fatal error: in "AcquisitionsTest/test_acquisition_header": memory access violation at address: 0x7feffb7c936: invalid address alignment Note that even on architectures where unaligned access is permitted it can be slower than aligned access. > Ghis cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed