Print warning if incompatible alignment option chosen #6184
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mvieth
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Users repeatedly report segmentation faults coming from Memory.h in the Eigen code (aligned_free/handmade_aligned_free). This is because PCL uses Eigen's handmade_aligned_malloc but user code does not use the corresponding handmade_aligned_free (or the other way around), due to chosen SSE/AVX flags and the resulting alignment requirements. PCL's CMake config handles this by automatically setting SSE/AVX options in the user project as they are used in PCL, but not everyone uses CMake. This commit adds a check within PCL's header files for this kind of incompatibility. At first I considered solving theses incompatibilities automatically by setting EIGEN_MALLOC_ALREADY_ALIGNED and EIGEN_MAX_ALIGN_BYTES, but that would have been more complex and error-prone, so I decided only for checking and warning. I would have preferred `#warning` which however is not available on MSVC. `#pragma message` is an option on MSVC, but this is too easily overlooked IMO. Users have the option to silence this by defining the `PCL_SILENCE_MALLOC_WARNING` macro (in case of false positive).
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Users repeatedly report segmentation faults coming from Memory.h in the Eigen code (aligned_free/handmade_aligned_free). This is because PCL uses Eigen's handmade_aligned_malloc but user code does not use the corresponding handmade_aligned_free (or the other way around), due to chosen SSE/AVX flags and the resulting alignment requirements. PCL's CMake config handles this by automatically setting SSE/AVX options in the user project as they are used in PCL, but not everyone uses CMake. This commit adds a check within PCL's header files for this kind of incompatibility.
At first I considered solving theses incompatibilities automatically by setting EIGEN_MALLOC_ALREADY_ALIGNED and EIGEN_MAX_ALIGN_BYTES, but that would have been more complex and error-prone, so I decided only for checking and warning.
I would have preferred
#warningwhich however is not available on MSVC.#pragma messageis an option on MSVC, but this is too easily overlooked IMO. Users have the option to silence this by defining thePCL_SILENCE_MALLOC_WARNINGmacro (in case of false positive).