https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85691
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Did you forget to enable warnings? GCC warns about test2 but not test:
$ g++ -Wall -c 85691.cc
85691.cc: In constructor ‘test2::test2(int)’:
85691.cc:14:13: warning: ‘test2::data’ will be initialized after [-Wreorder]
int data;
^~~~
85691.cc:13:13: warning: ‘int test2::x’ [-Wreorder]
int x;
^
85691.cc:16:9: warning: when initialized here [-Wreorder]
test2(int o) : data(o), x(data) { }
^~~~~
Clang has the same behaviour for -Wreorder, but it additionally warns about
test::data with -Wuninitialized:
85691.cc:4:17: warning: field 'data' is uninitialized when used here
[-Wuninitialized]
int x = data;
^
85691.cc:7:9: note: during field initialization in this constructor
test(int o) : data(o) { }
^
85691.cc:16:24: warning: field 'data' will be initialized after field 'x'
[-Wreorder]
test2(int o) : data(o), x(data) { }
^
85691.cc:16:35: warning: field 'data' is uninitialized when used here
[-Wuninitialized]
test2(int o) : data(o), x(data) { }
^
3 warnings generated.
We already have Bug 19808 covering this.
*** This bug has been marked as a duplicate of bug 19808 ***
