The patch titled
Subject: tools/build: tweak unused value workaround
has been added to the -mm tree. Its filename is
tools-build-tweak-unused-value-workaround.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/tools-build-tweak-unused-value-workaround.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/tools-build-tweak-unused-value-workaround.patch
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------------------------------------------------------
From: George Burgess IV <gbiv@xxxxxxxxxx>
Subject: 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
Link: http://lkml.kernel.org/r/20200414195638.156123-1-gbiv@xxxxxxxxxx
Signed-off-by: George Burgess IV <gbiv@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/build/feature/test-sync-compare-and-swap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/build/feature/test-sync-compare-and-swap.c~tools-build-tweak-unused-value-workaround
+++ a/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));
_
Patches currently in -mm which might be from gbiv@xxxxxxxxxx are
tools-build-tweak-unused-value-workaround.patch
