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tools/build: tweak unused value workaround
Clang has -Wself-assign enabled by default under -Wall, which always gets -Werror'ed on this file, causing sync-compare-and-swap to be disabled by default. The generally-accepted way to spell "this value is intentionally unused," is casting it to `void`. This is accepted by both GCC and Clang with -Wall enabled: https://godbolt.org/z/qqZ9r3 Signed-off-by: George Burgess IV <gbiv@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Link: http://lkml.kernel.org/r/20200414195638.156123-1-gbiv@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 1 additions and 1 deletions
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@ -7,7 +7,7 @@ int main(int argc, char *argv[])
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{
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{
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uint64_t old, new = argc;
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uint64_t old, new = argc;
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argv = argv;
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(void)argv;
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do {
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do {
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old = __sync_val_compare_and_swap(&x, 0, 0);
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old = __sync_val_compare_and_swap(&x, 0, 0);
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} while (!__sync_bool_compare_and_swap(&x, old, new));
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} while (!__sync_bool_compare_and_swap(&x, old, new));
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