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From: | Nathan Kennedy |
Subject: | Re: regex no longer needs to depend on malloc-gnu |
Date: | Fri, 18 Apr 2014 10:47:54 -0400 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 4/18/2014 1:44 AM, Paul Eggert wrote:
If saving that one test is worth the risk that MALLOC_0_IS_NONNULL will always be correctly be defined, e.g. that this will never always be true for all potential users:It's not needed for correctness, but it helps performance on GNU hosts, no? It lets them avoid an unnecessary test "size != 0" at runtime. The MALLOC_0_IS_NONNULL test is done at compile-time, and has no runtime overhead.the MALLOC_0_IS_NONNULL macro attempting to check for malloc(0) failure is not needed.
+#ifdef _LIBC +# define MALLOC_0_IS_NONNULL 1 uClibc defines it too: libc-symbols.h:#define _LIBC 1 Nathan
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