Wes McKinney created ARROW-2668:
-----------------------------------
Summary: [C++] -Wnull-pointer-arithmetic warning with dlmalloc.c
on clang 6.0, Ubuntu 14.04
Key: ARROW-2668
URL: https://issues.apache.org/jira/browse/ARROW-2668
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 0.9.0
Reporter: Wes McKinney
Fix For: 0.10.0
I encountered this failure with {{-Werror}} on a nearly fresh Ubuntu 14.04
install using clang-6 from LLVM apt
{code}
../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))));
{code}
See gist for complete log
https://gist.github.com/wesm/61ee3592045bfaf390d5d4557f3c5a22
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