================
@@ -0,0 +1,130 @@
+// RUN: %clang_cc1 -fsyntax-only -Wunused-but-set-variable -verify %s
+// RUN: %clang_cc1 -fsyntax-only -Wunused-but-set-variable -I %S -verify
%S/Inputs/warn-unused-but-set-static-global-header-test.c
+
+#define NULL (void*)0
+
+void *set(int size);
+void func_call(void *);
+
+static int set_unused; // expected-warning {{variable 'set_unused' set but not
used}}
+static int set_and_used;
+static int only_used;
+static int addr_taken;
+extern int external_var; // No warning (external linkage).
+extern int global_var; // No warning (not static).
+
+void f1() {
+ set_unused = 1;
+ set_and_used = 2;
+
+ int x = set_and_used;
+ (void)x;
+
+ int y = only_used;
+ (void)y;
+
+ int *p = &addr_taken;
+ (void)p;
+
+ external_var = 3;
+ global_var = 4;
+}
+
+// Test across multiple functions.
+static int set_used1;
+static int set_used2;
+
+static int set1; // expected-warning {{variable 'set1' set but not used}}
+static int set2; // expected-warning {{variable 'set2' set but not used}}
+
+void f2() {
+ set1 = 1;
+ set_used1 = 1;
+
+ int x = set_used2;
+ (void)x;
+}
+
+void f3() {
+ set2 = 2;
+ set_used2 = 2;
+
+ int x = set_used1;
+ (void)x;
+}
+
+static volatile int vol_set; // expected-warning {{variable 'vol_set' set but
not used}}
----------------
jpjepko wrote:
FWIW, I did some experimentation and both `-Wunused-but-set` and
`-Wunused-variable` warn on volatiles when built from the main branch, so that
might be behavior we want to match, unless there's good reason to diverge for
file-scope statics.
https://github.com/llvm/llvm-project/pull/178342
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