https://llvm.org/bugs/show_bug.cgi?id=25472
Bug ID: 25472
Summary: __attribute__((deprecated)) doesn't appear for
implicit construction of rvalues
[-Wdeprecated-declarations]
Product: clang
Version: unspecified
Hardware: Macintosh
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: ole...@feralinteractive.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
When the __attribute__((deprecated)) attribute is added to an implicit
constructor, the -Wdeprecated-declarations warning will not always appear.
It seems to appear in the following cases:
- constructing an lvalue.
- explicitly constructing an rvalue.
It doeesn't seem to appear in the following cases:
- implicitly constructing an rvalue.
Example "test.cpp":
class X
{
public:
X() { }
X(char d) __attribute__((deprecated("no no no."))) { }
const X operator+(const X&) const {return X();}
};
void doesntwarn_fn(const X&) { }
int main()
{
X warns0 ('0');
X warns1 = '1';
X warns2 = '1' + '1';
X warns3 = X() + X('9');
X doesntwarn = X() + '2' + '3';
doesntwarn_fn( '6' );
// mute unused warnings.
(void) (warns0 + warns1 + warns2 + warns3 + doesntwarn);
}
Result:
clang -Wall -o test test.cpp
test.cpp:12:4: warning: 'X' is deprecated: no no no.
[-Wdeprecated-declarations]
X warns0 ('0');
^
test.cpp:5:2: note: 'X' has been explicitly marked deprecated here
X(char d) __attribute__((deprecated("no no no."))) { }
^
test.cpp:13:4: warning: 'X' is deprecated: no no no.
[-Wdeprecated-declarations]
X warns1 = '1';
^
test.cpp:5:2: note: 'X' has been explicitly marked deprecated here
X(char d) __attribute__((deprecated("no no no."))) { }
^
test.cpp:14:4: warning: 'X' is deprecated: no no no.
[-Wdeprecated-declarations]
X warns2 = '1' + '1';
^
test.cpp:5:2: note: 'X' has been explicitly marked deprecated here
X(char d) __attribute__((deprecated("no no no."))) { }
^
test.cpp:15:19: warning: 'X' is deprecated: no no no.
[-Wdeprecated-declarations]
X warns3 = X() + X('9');
^
test.cpp:5:2: note: 'X' has been explicitly marked deprecated here
X(char d) __attribute__((deprecated("no no no."))) { }
^
4 warnings generated.
Tested on the two following clang versions with identical results:
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin15.0.0
Thread model: posix
clang version 3.5.0 (tags/RELEASE_350/final)
Target: x86_64-redhat-linux-gnu
Thread model: posix
Result in GCC:
gcc --version
gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
gcc -Wall -o test test.cpp
test.cpp: In function ‘int main()’:
test.cpp:12:15: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
X warns0 ('0');
^
test.cpp:13:13: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
X warns1 = '1';
^
test.cpp:14:19: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
X warns2 = '1' + '1';
^
test.cpp:15:24: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
X warns3 = X() + X('9');
^
test.cpp:16:23: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
X doesntwarn = X() + '2' + '3';
^
test.cpp:16:29: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
X doesntwarn = X() + '2' + '3';
^
test.cpp:17:21: warning: ‘X::X(char)’ is deprecated (declared at test.cpp:5):
no no no. [-Wdeprecated-declarations]
doesntwarn_fn( '6' );
^
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