http://llvm.org/bugs/show_bug.cgi?id=14921
Bug #: 14921
Summary: recursive lambda warns "uninitialized within its own
definition"
Product: clang
Version: 3.2
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Compiling the following code with "clang++ -std=c++11 -Wuninitialized" results
in the following warning:
cpp1.cpp:9:7: warning: variable 'recur' is uninitialized when used within its
own initialization [-Wuninitialized]
recur(val - 1);
^~~~~
1 warning generated.
This is with clang 3.2 release. I think it has not happened with 3.1, though I
cannot test that at the moment as I don't have 3.1 installed anymore.
The code executes just fine and prints out the expected ("210").
Compiling with "-O2" yields code that runs just as well.
Code:
#include <functional>
#include <iostream>
int
main() {
std::function<void(unsigned int)> recur = [&recur](unsigned int val) {
std::cout << val;
if (val)
recur(val - 1);
};
recur(2);
std::cout << std::endl;
return 0;
}
Splitting the assignment into declaration and assignment makes the warning go
away:
std::function<void(unsigned int)> recur;
recur = [&recur](unsigned int val) {
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