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[08/15] tools/build: tweak unused value workaround

Message ID 20200421011401.UOadM_a5p%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [01/15] sh: fix build error in mm/init.c | expand

Commit Message

Andrew Morton April 21, 2020, 1:14 a.m. UTC 
From: George Burgess IV <gbiv@google.com>
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@google.com
Signed-off-by: George Burgess IV <gbiv@google.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/build/feature/test-sync-compare-and-swap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

--- 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));