http://llvm.org/bugs/show_bug.cgi?id=3577
Summary: clang does not detect some compile time constants.
Product: clang
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Semantic Analyzer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
The following pieces of code are from the gcc test suite.
While gcc compiles without problems, clang does not detect that
the values assigned to the static variables are compile time known.
The last two pieces are really bizarre, but the other two use idioms
actually pretty common in low level C code.
/*920928-1.c*/
struct{int c;}v;
static long i=((char*)&(v.c)-(char*)&v);
/*end*/
/*930326-1.c*/
struct
{
char a, b, f[3];
} s;
long i = s.f-&s.b;
/*end*/
/*labels-3.c*/
int foo (int a)
{
static const short ar[] = { &&l1 - &&l1, &&l2 - &&l1 };
void *p = &&l1 + ar[a];
goto *p;
l1:
return 1;
l2:
return 2;
}
/*end*/
/*20001116-1.c */
int x[60];
char *y = ((char*)&(x[2*8 + 2]) - 8);
int z = (&"Foobar"[1] - &"Foobar"[0]);
/*end*/
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