https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78217
Bug ID: 78217
Summary: Duplicate decls handling with auto
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
Target Milestone: ---
I've noticed that we error out in both cases on following testcase:
extern int a;
auto a = 1;
extern int b;
auto b = 2LL;
test.C:2:6: error: conflicting declaration ‘auto a’
auto a = 1;
^
test.C:1:12: note: previous declaration as ‘int a’
extern int a;
^
test.C:4:6: error: conflicting declaration ‘auto b’
auto b = 2LL;
^
test.C:3:12: note: previous declaration as ‘int b’
extern int b;
^
while clang++ rejects only the latter:
test.C:4:6: error: redefinition of 'b' with a different type: 'long long' vs
'int'
auto b = 2LL;
^
test.C:3:12: note: previous declaration is here
extern int b;
^
1 error generated.
That is because we perform duplicate_decls already at start_decl time, but we
probably need to defer it for the auto deduction cases until cp_finish_decl
time when we actually know the type.
