| // Protocol Buffers - Google's data interchange format |
| // Copyright 2017 Google Inc. All rights reserved. |
| // |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file or at |
| // https://developers.google.com/open-source/licenses/bsd |
| |
| #include <string.h> |
| |
| // 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/protocolbuffers/protobuf/issues/2783). |
| // |
| // This wrapper is enabled by passing the linker flags -Wl,-wrap,memcpy in |
| // extconf.rb. |
| #ifdef __linux__ |
| #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); |
| } |
| #else |
| void *__wrap_memcpy(void *dest, const void *src, size_t n) { |
| return memmove(dest, src, n); |
| } |
| #endif |
| #endif |
