http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52540
Bug #: 52540
Summary: std::use_facet throws bad_cast when compiled with
_GLIBCXX_DEBUG
Classification: Unclassified
Product: gcc
Version: 4.6.4
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: pl...@agmk.net
Target: x86_64-w64-mingw32
#include <iostream>
#include <locale>
#include <cstring>
#include <ctime>
int main()
{
std::tm tm;
std::time_t tt;
std::time( &tt );
tm = *std::localtime( &tt );
std::locale lc( "C" );
std::cout.imbue( lc );
std::time_put< char > const& timeFacet = std::use_facet< std::time_put<
char > >( std::cout.getloc() );
char const pattern[] = "%x %X";
timeFacet.put( std::cout, std::cout, std::cout.fill(), &tm, pattern,
pattern + std::strlen( pattern ) );
}
$ x86_64-w64-mingw32-g++ main.cpp -o main-release.exe -g2
$ x86_64-w64-mingw32-g++ main.cpp -o main-debug.exe -g2 -D_GLIBCXX_DEBUG
release-run:
Starting program: main-release.exe
[New Thread 2776.0xdbc]
Breakpoint 1, main () at main.cpp:7
7 {
(gdb) n
10 std::time( &tt );
(gdb)
11 tm = *std::localtime( &tt );
(gdb)
12 std::locale lc( "C" );
(gdb)
13 std::cout.imbue( lc );
(gdb) p lc
$2 = {static none = 0, static ctype = 1, static numeric = 2, static collate =
4, static time = 8, static monetary = 16,
static messages = 32, static all = 63, _M_impl = 0x626e9460, static
_S_classic = 0x626e9460, static _S_global = 0x626e9460,
static _S_categories = 0x626eadc0, static _S_once = {done = 1, started = 0}}
(gdb) c
Continuing.
03/09/12 11:53:50
Program exited normally.
debug-run:
Starting program: main-debug.exe
[New Thread 2704.0xd4c]
Breakpoint 1, main () at main.cpp:7
7 {
(gdb) l
2 #include <locale>
3 #include <cstring>
4 #include <ctime>
5
6 int main()
7 {
8 std::tm tm;
9 std::time_t tt;
10 std::time( &tt );
11 tm = *std::localtime( &tt );
(gdb) n
10 std::time( &tt );
(gdb)
11 tm = *std::localtime( &tt );
(gdb)
12 std::locale lc( "C" );
(gdb)
13 std::cout.imbue( lc );
(gdb) p lc
$1 = {static none = 0, static ctype = 1, static numeric = 2, static collate =
4, static time = 8, static monetary = 16,
static messages = 32, static all = 63, _M_impl = 0x626e9460, static
_S_classic = 0x626e9460, static _S_global = 0x626e9460,
static _S_categories = 0x626eadc0, static _S_once = {done = 1, started = 0}}
(gdb) n
14 std::time_put< char > const& timeFacet = std::use_facet<
std::time_put< char > >( std::cout.getloc() );
(gdb)
terminate called after throwing an instance of 'std::bad_cast'
what(): std::bad_cast
