http://llvm.org/bugs/show_bug.cgi?id=16548
Bug ID: 16548
Summary: False warning: address of stack memory associated with
local
Product: clang
Version: 3.3
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
Here code:
#include <cstdio>
void f()
{
static const size_t buf_size = 30;
char fmt_buf[buf_size];
auto my_fmt_f = [&fmt_buf](int a, int b) -> char * {
snprintf(fmt_buf, buf_size, "AA %d BB %d CC\n", a, b);
return fmt_buf;
};
puts(my_fmt_f(10, 20));
puts(my_fmt_f(30, 2));
}
int main()
{
f();
return 0;
}
$ clang++ -Wall -std=c++11 return_stack_address.cpp
return_stack_address.cpp:9:10: warning: address of stack memory associated with
local variable 'fmt_buf' returned [-Wreturn-stack-address]
return fmt_buf;
^~~~~~~
1 warning generated.
I think that this is false warning, and for example g++ not generate warning on
this code, while it generate warning for example if
char *f()
...
return fmt_buf;
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