https://bugs.llvm.org/show_bug.cgi?id=50236
Bug ID: 50236
Summary: `-Wsometimes-uninitialized` false positive for
assignment
Product: new-bugs
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 24832
--> https://bugs.llvm.org/attachment.cgi?id=24832&action=edit
Repro
Compiling the attached C source (named sometimes.c) gives the following
warning:
sometimes.c:8:7: warning: variable 'a' is used uninitialized whenever 'if'
condition is false [-Wsometimes-uninitialized]
if (!c) c = foo(&a);
^~
sometimes.c:9:7: note: uninitialized use occurs here
b = a;
^
sometimes.c:8:3: note: remove the 'if' if its condition is always true
if (!c) c = foo(&a);
^~~~~~~~
sometimes.c:7:8: note: initialize the variable 'a' to silence this warning
int a, b;
^
= 0
1 warning generated.
At line 9, the value of sometimes-uninitialized variable `a` is only assigned
to another variable `b`, and so it should not be warned until the value is
actually used.
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