http://llvm.org/bugs/show_bug.cgi?id=13747
Bug #: 13747
Summary: [linux kernel] -Wunused-value should not warn about
unused statement expression result expanded from a
macro
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The linux kernel uses something logically equivalent to:
$ cat t.c
void stuff(int,int,int);
#define memset(x,y,z) ({ stuff(x,y,z); x; })
void foo(int a, int b, int c) {
memset(a,b,c);
}
... which causes tons and tons of -Wunused-value warnings to be produced:
$ clang t.c -fsyntax-only
t.c:5:10: warning: expression result unused [-Wunused-value]
memset(a,b,c);
~~~~~~~^~~~~~
t.c:2:40: note: expanded from macro 'memset'
#define memset(x,y,z) ({ stuff(x,y,z); x; })
^
This is clearly not useful. We should disable this warning when the unused
value is a statement expression expanded from a macro.
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