[PATCH] dtc: Remove unused dts_version in dtc-lexer.l

Nathan Chancellor
2026-03-26T00:13:53Z

A recent strengthening of -Wunused-but-set-variable (enabled with -Wall)
in clang under a new subwarning, -Wunused-but-set-global, points out an
unused static global variable in dtc-lexer.l:

../dtc-lexer.l:42:12: error: variable 'dts_version' set but not used [-Werror,-Wunused-but-set-global]
42 | static int dts_version = 1;
| ^

This variable has been unused since commit 4e1a0a0 ("Remove support for
the legacy DTS source file format."). Remove it to clear up the warning.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
dtc-lexer.l | 3 ---
1 file changed, 3 deletions(-)

diff --git a/dtc-lexer.l b/dtc-lexer.l
index 15d585c..1b129b1 100644
--- a/dtc-lexer.l
+++ b/dtc-lexer.l
@@ -39,8 +39,6 @@ extern bool treesource_error;
#define DPRINT(fmt, ...) do { } while (0)
#endif

-static int dts_version = 1;
-
#define BEGIN_DEFAULT() DPRINT("<V1>\n"); \
BEGIN(V1); \

@@ -101,7 +99,6 @@ static void PRINTF(1, 2) lexical_error(const char *fmt, ...);

<*>"/dts-v1/" {
DPRINT("Keyword: /dts-v1/\n");
- dts_version = 1;
BEGIN_DEFAULT();
return DT_V1;
}

---
base-commit: caf7465c5d60a56e00ea8c6b6eeb4e443371f815
change-id: 20260325-dtc-lexer-remove-dts_version-dbf0fcd4aec4

Best regards,
--
Nathan Chancellor <nathan@kernel.org>