false negative for `-Wshift-overflow`

[llvmbot]

Bugzilla Link	24283
Version	unspecified
OS	Windows NT
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor,@Weverything

Extended Description

See r243241 for reference. http://llvm.org/viewvc/llvm-project?view=revision&revision=243241

% cat shift.c

#include <sys/types.h>

static const uint32_t kFlagSync  = 2 << 30;
static const uint32_t kFlagSync2 = 1 << 35;

% ./clang shift.c -Wshift-overflow
shift.c:4:38: warning: shift count >= width of type [-Wshift-count-overflow]
static const uint32_t kFlagSync2 = 1 << 35;

[llvmbot]

It's UB also in C++.
Richard Smith submitted the defect a while ago http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1450

[llvmbot]

It's UB also in C++.
Richard Smith submitted the defect a while ago
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1450

Sorry this comment was for llvm/llvm-bugzilla-archive#24338