When using g++ from devtoolset-12-gcc-c++ to compile a test file, a warning about uninitialized memory is shown. This warning is not present on devtoolset-11-gcc-c++.

~~~
$ cat foo.cpp
#include <string>

struct Foo
{
static Foo OK;

~Foo() noexcept( false ) {}
};

Foo Foo::OK;

Foo run()
{
if ( 1 == 0 )

switch ( 1 )
{
case 1:
{
try

catch ( int ex )
{
}
}
}

std::string text;

return Foo::OK;
}
~~~

When using devtoolset-11-gcc-c+, it compiles without warnings. When using devtoolset-12-gcc-c+, the following is shown:

~~~
[root@r79 ~]# source /opt/rh/devtoolset-12/enable
[root@r79 ~]# g++ -Wall -c src/foo.cpp -o obj/foo.o
src/foo.cpp: In function ‘Foo run()’:
src/foo.cpp:26:10: warning: ‘<anonymous>’ is used uninitialized [-Wuninitialized]
26 | }