[LLVMbugs] [Bug 20008] New: clang-cl doesn't support the ui32 type suffix properly

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jun 11 20:03:08 PDT 2014


            Bug ID: 20008
           Summary: clang-cl doesn't support the ui32 type suffix properly
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ehsan at mozilla.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The headers that ship with MSVC define UINT32_MAX as 0xffffffffui32.  I'm not
100% sure what "ui32" is but I assume it denotes a uint32_t type.  It seems
like this confuses clang-cl a bit, which makes it a pain in places where for
example we call std::min with a uint32_t argument and a UINT32_MAX-1 argument. 
Here is a minimal test case demonstrating the issue:

#include <stdint.h>
template<class T> T min(T, T);
#define MAX 0xffffffffui32
void test() {
  uint32_t a;
  min(a, MAX - 1);

$ ./bin/clang-cl -c test.cpp
test.cpp(6,3) :  error: no matching function for call to 'min'
  min(a, MAX - 1);
test.cpp(2,21) :  note: candidate template ignored: deduced conflicting types
for parameter 'T' ('unsigned int' vs. 'unsigned long')
template<class T> T min(T, T);
1 error generated.

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