https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107805
Bug ID: 107805
Summary: Spurious warning after redefinition of type
Product: gcc
Version: 12.2.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: fw at gcc dot gnu.org
Target Milestone: ---
With gcc-11.3.1-3.fc35.x86_64, this program
typedef int t;
typedef struct { double a; int b; } t;
t x;
produces:
t.c:2:37: error: conflicting types for ‘t’; have ‘struct <anonymous>’
2 | typedef struct { double a; int b; } t;
| ^
t.c:1:13: note: previous declaration of ‘t’ with type ‘t’ {aka ‘int’}
1 | typedef int t;
| ^
which is expected. But with gcc-12.2.1-3.fc38.x86_64, I get this instead:
t.c:2:37: error: conflicting types for ‘t’; have ‘struct <anonymous>’
2 | typedef struct { double a; int b; } t;
| ^
t.c:1:13: note: previous declaration of ‘t’ with type ‘t’ {aka ‘int’}
1 | typedef int t;
| ^
t.c:3:3: warning: type defaults to ‘int’ in declaration of ‘x’ [-Wimplicit-int]
3 | t x;
| ^
Note the spurious warning. This causes problems with attempts to eliminate
implicit int, so it would be nice to fix this.
