Commit 18d5e6c3 authored by Michael Davidson's avatar Michael Davidson Committed by Ingo Molnar

x86/boot: #undef memcpy() et al in string.c

undef memcpy() and friends in boot/string.c so that the functions
defined here will have the correct names, otherwise we end up
up trying to redefine __builtin_memcpy() etc.

Surprisingly, GCC allows this (and, helpfully, discards the
__builtin_ prefix from the function name when compiling it),
but clang does not.

Adding these #undef's appears to preserve what I assume was
the original intent of the code.
Signed-off-by: default avatarMichael Davidson <md@google.com>
Signed-off-by: default avatarMatthias Kaehlcke <mka@chromium.org>
Acked-by: default avatarH. Peter Anvin <hpa@zytor.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bernhard.Rosenkranzer@linaro.org
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170724235155.79255-1-mka@chromium.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 520eccdf
......@@ -16,6 +16,15 @@
#include "ctype.h"
#include "string.h"
/*
* Undef these macros so that the functions that we provide
* here will have the correct names regardless of how string.h
* may have chosen to #define them.
*/
#undef memcpy
#undef memset
#undef memcmp
int memcmp(const void *s1, const void *s2, size_t len)
{
bool diff;
......
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