ea5ef14aa0
We have some special code in wrap_memcpy.c to ensure that we use the 2.2.5 version of memcpy, for compatibility with older versions of glibc. However, we need to make sure we only attempt to do this when we are actually building with glibc, so that the code can also build successfully against other libc implementations such as musl.
52 lines
2.4 KiB
C
52 lines
2.4 KiB
C
// Protocol Buffers - Google's data interchange format
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// Copyright 2017 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <string.h>
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// On x86-64 Linux with glibc, we link against the 2.2.5 version of memcpy so
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// that we avoid depending on the 2.14 version of the symbol. This way,
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// distributions that are using pre-2.14 versions of glibc can successfully use
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// the gem we distribute (https://github.com/google/protobuf/issues/2783).
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//
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// This wrapper is enabled by passing the linker flags -Wl,-wrap,memcpy in
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// extconf.rb.
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#ifdef __linux__
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#if defined(__x86_64__) && defined(__GNU_LIBRARY__)
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__asm__(".symver memcpy,memcpy@GLIBC_2.2.5");
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void *__wrap_memcpy(void *dest, const void *src, size_t n) {
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return memcpy(dest, src, n);
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}
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#else
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void *__wrap_memcpy(void *dest, const void *src, size_t n) {
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return memmove(dest, src, n);
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}
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#endif
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#endif
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