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Merge pull request #2870 from acozzette/memcpy-memmove

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Ruby: only link against specific version of memcpy if we're using glibc
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Adam Cozzette 2017-03-20 08:26:06 -07:00 committed by GitHub
commit 4d273f28dc
1 changed files with 5 additions and 5 deletions
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10
ruby/ext/google/protobuf_c/wrap_memcpy.c
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@ -30,15 +30,15 @@
#include <string.h>
// On x86-64 Linux, we link against the 2.2.5 version of memcpy so that we
// avoid depending on the 2.14 version of the symbol. This way, distributions
// that are using pre-2.14 versions of glibc can successfully use the gem we
// distribute (https://github.com/google/protobuf/issues/2783).
// On x86-64 Linux with glibc, we link against the 2.2.5 version of memcpy so
// that we avoid depending on the 2.14 version of the symbol. This way,
// distributions that are using pre-2.14 versions of glibc can successfully use
// the gem we distribute (https://github.com/google/protobuf/issues/2783).
//
// This wrapper is enabled by passing the linker flags -Wl,-wrap,memcpy in
// extconf.rb.
#ifdef __linux__
#ifdef __x86_64__
#if defined(__x86_64__) && defined(__GNU_LIBRARY__)
__asm__(".symver memcpy,memcpy@GLIBC_2.2.5");
void *__wrap_memcpy(void *dest, const void *src, size_t n) {
return memcpy(dest, src, n);