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authorGeorge Burgess IV <gbiv@google.com>2020-04-20 18:14:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-21 11:11:55 -0700
commita21151b9d81a69ce334f409e7f98e50e3b8fa984 (patch)
treef566258df63cb13714ff08948c9a3463c52bc2de /tools/build
parent461e1565366e84f7c9ccaf40730e4e892c70700f (diff)
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>
Diffstat (limited to 'tools/build')
-rw-r--r--tools/build/feature/test-sync-compare-and-swap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/build/feature/test-sync-compare-and-swap.c b/tools/build/feature/test-sync-compare-and-swap.c
index 1e38d1930a97..3bc6b0768a53 100644
--- a/tools/build/feature/test-sync-compare-and-swap.c
+++ b/tools/build/feature/test-sync-compare-and-swap.c
@@ -7,7 +7,7 @@ int main(int argc, char *argv[])
{
uint64_t old, new = argc;
- argv = argv;
+ (void)argv;
do {
old = __sync_val_compare_and_swap(&x, 0, 0);
} while (!__sync_bool_compare_and_swap(&x, old, new));