https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119043
Bug ID: 119043
Summary: GCC 14.2 Fails to Parse Empty Attribute [[ ]] in Array
new Expression
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: qurong at ios dot ac.cn
Target Milestone: ---
GCC 14.2 incorrectly rejects array new expressions containing empty attribute
specifiers ([[ ]]), while MSVC and Clang accept them as valid C++ code. This
violates the C++ standard syntax rules.
For the following code test.cpp:
```
int main() {
auto p = new int[5][[]]; // Empty attribute [[ ]]
delete[] p;
return 0;
}
```
Compile with GCC 14.2:
g++ -std=c++17 test.cpp
Expected Result:
Compilation succeeds, as empty attributes [[ ]] are explicitly allowed by the
C++ standard.
Actual Result:
GCC 14.2 reports:
test.cpp: In function ‘int main()’:
test.cpp:2:28: error: expected primary-expression before ‘]’ token
2 | auto p = new int[5][[]];
| ^
Environment:
Compiler: GCC 14.2
Flags: -std=c++17
Proposal:
Fix the parser to recognize empty attribute specifiers ([[ ]]) in array new
expressions.
Additional Notes:
Standard Compliance:
C++17 §10.6.1 allows empty attribute lists.
Clang and MSVC demonstrate correct behavior.
Compiler Explorer link: https://godbolt.org/z/azWxGdGn6
