http://llvm.org/bugs/show_bug.cgi?id=15906
Bug ID: 15906
Summary: incorrect warning about uninitialized variable in
lamba function argument
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 10464
--> http://llvm.org/bugs/attachment.cgi?id=10464&action=edit
cc file that contains the bug
the following program generates an invalid warning:
#include <iostream>
#include <functional>
struct A {
A(std::function< void (void)> lf) : m_f(lf) {};
void exec() { m_f(); };
std::function<void(void)> m_f;
bool m_b = false;
};
namespace {
A x([](){ x.m_b = true; std::cout << "x.m_b: " << x.m_b << std::endl; });
}
int main()
{
x.exec();
return 0;
}
the warning is:
clang++ -std=gnu++11 -Wall -Weffc++ -D__STRICT_ANSI__ -I . -O0 -ggdb -o t_clang
main.cc
main.cc:13:54: warning: variable 'x' is uninitialized when used within its own
initialization [-Wuninitialized]
A x([](){ x.m_b = true; std::cout << "x.m_b: " << x.m_b << std::endl; });
~ ^
1 warning generated.
The warning in invalid, because the lambda is not executed inside the A c'tor,
but outside, at x.exec()! It can never be otherwise!
$ clang++ --version
clang version 3.3 (trunk 178622)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Makefile:
all: gcc clang
gcc:
g++ -std=gnu++11 -Wall -Weffc++ -I . -O0 -ggdb -o t_gcc main.cc
@ls -sh t_gcc
clang:
clang++ -std=gnu++11 -Wall -Weffc++ -D__STRICT_ANSI__ -I . -O0 -ggdb -o
t_clang main.cc
@ls -sh t_clang
clean:
@rm -f t_gcc
@rm -f t_clang
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