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  1. Apache Arrow
  2. ARROW-2668

[C++] -Wnull-pointer-arithmetic warning with dlmalloc.c on clang 6.0, Ubuntu 14.04

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 0.9.0
    • 0.10.0
    • C++

    Description

      I encountered this failure with -Werror on a nearly fresh Ubuntu 14.04 install using clang-6 from LLVM apt

      ../src/plasma/thirdparty/dlmalloc.c:3504:68: error: arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension [-Werror,-Wnull-pointer-arithmetic]
            size_t mfree = m->topsize + (((((size_t)(((void*)((char*)(0) + ((sizeof(size_t))<<1)))) & (((size_t)(2 * sizeof(void *))) - ((size_t)1))) == 0)? 0 : ((((size_t)(2 * sizeof(void *))) - ((size_t)(((void*)((char*)(0) + ((sizeof(size_t))<<1)))) & (((size_t)(2 * sizeof(void *))) - ((size_t)1)))) & (((size_t)(2 * sizeof(void *))) - ((size_t)1))))+(((sizeof(struct malloc_segment)) + ((sizeof(size_t))) + (((size_t)(2 * sizeof(void *))) - ((size_t)1))) & ~(((size_t)(2 * sizeof(void *))) - ((size_t)1)))+(((sizeof(mchunk)) + (((size_t)(2 * sizeof(void *))) - ((size_t)1))) & ~(((size_t)(2 * sizeof(void *))) - ((size_t)1))));
      

      See gist for complete log https://gist.github.com/wesm/61ee3592045bfaf390d5d4557f3c5a22

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              wesm Wes McKinney
              wesm Wes McKinney
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