https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107488
Bug ID: 107488
Summary: [13 Regression] -Werror=dangling-reference false
positives in cppunit
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
Target Milestone: ---
cppunit-1.15.1 and a few other projects fail to compile due to -Werror on
-Werror=dangling-reference. I think those are false positives. Extracted
example from cppunit:
// $ cat a.cpp.cpp
#include <vector>
int attributesAsString(std::vector<int> & v)
{
int attributes;
std::vector<int>::const_iterator itAttribute = v.begin();
while ( itAttribute != v.end() )
{
const int &attribute = *itAttribute++;
attributes += attribute;
}
return attributes;
}
$ g++-13.0.0 -Werror=dangling-reference -c a.cpp.cpp -o a.o
a.cpp.cpp: In function 'int attributesAsString(std::vector<int>&)':
a.cpp.cpp:12:16: error: possibly dangling reference to a temporary
[-Werror=dangling-reference]
12 | const int &attribute = *itAttribute++;
| ^~~~~~~~~
a.cpp.cpp:12:40: note: the temporary was destroyed at the end of the full
expression 'itAttribute.__gnu_cxx::__normal_iterator<const int*,
std::vector<int> >::operator++(0).__gnu_cxx::__normal_iterator<const int*,
std::vector<int> >::operator*()'
12 | const int &attribute = *itAttribute++;
| ^~
$ g++-13.0.0 -v
Using built-in specs.
COLLECT_GCC=/<<NIX>>/gcc-13.0.0/bin/g++
COLLECT_LTO_WRAPPER=/<<NIX>>/gcc-13.0.0/libexec/gcc/x86_64-unknown-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with:
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221030 (experimental) (GCC)
