https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63782
Bug ID: 63782
Summary: avoid implicit declaration warning for incompatible
builtin implicit declaration
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: manu at gcc dot gnu.org
void foo(char *str) {
strcpy(str, "foo");
}
[t@ws-520 examples]$ clang-3.5 -c -Wall test.c
test.c:2:3: warning: implicitly declaring library function 'strcpy' with
type 'char *(char *, const char *)'
strcpy(str, "foo");
^
test.c:2:3: note: include the header <string.h> or explicitly provide a
declaration for 'strcpy'
1 warning generated.
$ gcc-5 -c -Wall test.c
test.c: In function ‘foo’:
test.c:2:3: warning: implicit declaration of function ‘strcpy’
[-Wimplicit-function-declaration]
strcpy(str, "foo");
^
test.c:2:3: warning: incompatible implicit declaration of built-in function
‘strcpy’
test.c:2:3: note: include ‘<string.h>’ or provide a declaration of ‘strcpy’
The first warning is superfluous if the second is given.
(from a talk by Samsung at LinuxCon Europe:
http://events.linuxfoundation.org/sites/events/files/slides/linuxcon-europe-2014-llvm.pdf)
