1618023018
gcc's unused warnings which don't get emitted if the function is referenced even in an unevaluated context
(e.g. in templates, sizeof, etc.). Also, saying that a function is 'unused' because it won't get codegen'ed
is somewhat misleading.
- Don't emit 'unused' warnings for functions that are referenced in any part of the user's code.
- A warning that an internal function/variable won't get emitted is useful though, so introduce
-Wunneeded-internal-declaration which will warn if a function/variable with internal linkage is not
"needed" ('used' from the codegen perspective), e.g:
static void foo() { }
template <int>
void bar() {
foo();
}
test.cpp:1:13: warning: function 'foo' is not needed and will not be emitted
static void foo() { }
^
Addresses rdar://8733476.
llvm-svn: 129794
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
// RUN: %clang_cc1 -fsyntax-only -Wunused-function -Wunneeded-internal-declaration -verify %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wunused %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wall %s
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void foo() {}
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static void f2() {}
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static void f1() {f2();} // expected-warning{{unused}}
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static int f0() { return 17; } // expected-warning{{not needed and will not be emitted}}
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int x = sizeof(f0());
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static void f3();
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extern void f3() { } // expected-warning{{unused}}
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// FIXME: This will trigger a warning when it should not.
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// Update once PR6281 is fixed.
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//inline static void f4();
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//void f4() { }
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static void __attribute__((used)) f5() {}
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static void f6();
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static void __attribute__((used)) f6();
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static void f6() {};
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static void f7(void);
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void f8(void(*a0)(void));
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void f9(void) { f8(f7); }
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static void f7(void) {}
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__attribute__((unused)) static void bar(void);
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void bar(void) { }
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__attribute__((constructor)) static void bar2(void);
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void bar2(void) { }
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__attribute__((destructor)) static void bar3(void);
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void bar3(void) { }
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static void f10(void); // expected-warning{{unused}}
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static void f10(void);
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static void f11(void);
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static void f11(void) { } // expected-warning{{unused}}
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static void f12(void) { } // expected-warning{{unused}}
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static void f12(void);
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// PR7923
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static void unused(void) { unused(); } // expected-warning{{not needed and will not be emitted}}
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// rdar://8728293
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static void cleanupMalloc(char * const * const allocation) { }
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void f13(void) {
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char * const __attribute__((cleanup(cleanupMalloc))) a;
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(void)a;
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}
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