https://llvm.org/bugs/show_bug.cgi?id=26336
Bug ID: 26336
Summary: Clang allows address of array with 'register'
storage-class to be taken
Product: clang
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: sne...@dei.uc.pt
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Example:
extern int f(int *);
int main() {
register int x[1];
return f(x);
}
The C99 standard, in footnote 100 of ยง6.7.1, states
> However, whether or not addressable storage is actually used, the address
> of any part of an object declared with storage-class specifier register
> cannot be computed, either explicitly (by use of the unary & operator as
> discussed in 6.5.3.2) or implicitly (by converting an array name to a
> pointer as discussed in 6.3.2.1).
Clang already does the right thing for explicit & operators on register
variables. However it misses the implicit pointer decay of array types.
Thus the example above should fail with a "address of register variable
requested" error message.
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