The following code prints an incorrect return value from F.
#include <iostream>
#include <vector>
int F()
{
std::vector<char> buffer; // this can be any container
std::cout << std::endl;
return 12345;
std::cout << std::endl;
}
int main()
{
std::cout << F() << std::endl; // prints something other than 12345
}
If any of the lines in F are rearranged, the bug goes away. I did a fresh
rebuild of GCC 4.1.1 under MinGW and bug remained. Before the rebuild, the
return value was somewhat random, as if it were accessing invalid memory.
Since the rebuild, the return value has been a steady 0.
Compiled with:
$ g++ -oprog prog.cpp && prog
--
Summary: Corrupt return value in specific context
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: spam at david dot osborn dot name
GCC build triplet: i686-pc-mingw32
GCC host triplet: i686-pc-mingw32
GCC target triplet: i686-pc-mingw32
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30047
