https://llvm.org/bugs/show_bug.cgi?id=28407
Bug ID: 28407
Summary: Invalid C accepted: flexible array member in struct
with only unnamed member
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ch3r...@openwall.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
A flexible array member is only permitted in a struct when the struct contains
another _named_ member:
C11, 6.7.2.1p3: "A structure or union shall not contain a member with
incomplete or function type [...], except that the last member of a structure
with more than one named member may have incomplete array type"
This is a constraint violation and must be diagnosed.
Source code:
----------------------------------------------------------------------
int main()
{
struct s {
int :1;
int a[];
};
}
----------------------------------------------------------------------
Results:
----------------------------------------------------------------------
$ clang -std=c11 -Weverything -O3 test.c && ./a.out
----------------------------------------------------------------------
clang version: clang version 3.9.0 (trunk 271312)
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