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Normally, it won't warn about unused static inline functions defined in header files, because it's expected that a source file won't use all functions defined in a header file it includes. However, the DEF_VEC_* macros define those functions in source files, which leads clang to think that we should remove those functions. It is therefore missing a check to see whether those functions are resulting from macro expansion. A bug already exists for that: https://bugs.llvm.org//show_bug.cgi?id=22712 It's quite easy to silence this warning in a localized way, that is in the DEF_VEC_* macros. gdb/ChangeLog: * common/diagnostics.h (DIAGNOSTIC_IGNORE_UNUSED_FUNCTION): New macro. * common/vec.h: Include diagnostics.h. (DEF_VEC_I, DEF_VEC_P, DEF_VEC_O): Ignore -Wunused-function warning. --- gdb/common/diagnostics.h | 3 +++ gdb/common/vec.h | 11 +++++++++++ 2 files changed, 14 insertions(+) diff --git a/gdb/common/diagnostics.h b/gdb/common/diagnostics.h index 35bacf2..ee824a3 100644 --- a/gdb/common/diagnostics.h +++ b/gdb/common/diagnostics.h @@ -35,9 +35,12 @@ # define DIAGNOSTIC_IGNORE_SELF_MOVE DIAGNOSTIC_IGNORE ("-Wself-move") # define DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER \ DIAGNOSTIC_IGNORE ("-Wdeprecated-register") +# define DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ + DIAGNOSTIC_IGNORE ("-Wunused-function") #else # define DIAGNOSTIC_IGNORE_SELF_MOVE # define DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER +# define DIAGNOSTIC_IGNORE_UNUSED_FUNCTION #endif #endif /* COMMON_DIAGNOSTICS_H */ diff --git a/gdb/common/vec.h b/gdb/common/vec.h index 982f771..0221c88 100644 --- a/gdb/common/vec.h +++ b/gdb/common/vec.h @@ -20,6 +20,8 @@ #if !defined (GDB_VEC_H) #define GDB_VEC_H +#include "diagnostics.h" + /* The macros here implement a set of templated vector types and associated interfaces. These templates are implemented with macros, as we're not in C++ land. The interface functions are @@ -408,6 +410,8 @@ typedef struct VEC(T) \ /* Vector of integer-like object. */ #define DEF_VEC_I(T) \ +DIAGNOSTIC_PUSH \ +DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ static inline void VEC_OP (T,must_be_integral_type) (void) \ { \ (void)~(T)0; \ @@ -416,10 +420,13 @@ static inline void VEC_OP (T,must_be_integral_type) (void) \ VEC_T(T); \ DEF_VEC_FUNC_P(T) \ DEF_VEC_ALLOC_FUNC_I(T) \ +DIAGNOSTIC_POP \ struct vec_swallow_trailing_semi /* Vector of pointer to object. */ #define DEF_VEC_P(T) \ +DIAGNOSTIC_PUSH \ +DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ static inline void VEC_OP (T,must_be_pointer_type) (void) \ { \ (void)((T)1 == (void *)1); \ @@ -428,13 +435,17 @@ static inline void VEC_OP (T,must_be_pointer_type) (void) \ VEC_T(T); \ DEF_VEC_FUNC_P(T) \ DEF_VEC_ALLOC_FUNC_P(T) \ +DIAGNOSTIC_POP \ struct vec_swallow_trailing_semi /* Vector of object. */ #define DEF_VEC_O(T) \ +DIAGNOSTIC_PUSH \ +DIAGNOSTIC_IGNORE_UNUSED_FUNCTION \ VEC_T(T); \ DEF_VEC_FUNC_O(T) \ DEF_VEC_ALLOC_FUNC_O(T) \ +DIAGNOSTIC_POP \ struct vec_swallow_trailing_semi /* Avoid offsetof (or its usual C implementation) as it triggers