https://llvm.org/bugs/show_bug.cgi?id=31647
Bug ID: 31647
Summary: Clang-cl: conversion from 'long' to 'const QVariant'
is ambiguous
Product: clang
Version: 4.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: jva...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17843
--> https://llvm.org/bugs/attachment.cgi?id=17843&action=edit
Reproduction
The attachment contains a smaller reproduction scenario.
Problem occurred during conversion of MSVC codebase with Qt to clang-cl. (More
specially with the QVariant)
Using clang-cl from SVN r291454 (9 January 2017) (64 bit version from
http://llvm.org/builds/)
namespace {
struct A {
A(int) {}
A(unsigned int) {}
A(long long) {}
A(unsigned long long) {}
A(bool) {}
A(float) {}
A(double) {}
};
long getLong() { return 42; }
void f(const A &) {}
}
int main(int, char **)
{
f(getLong());
return 0;
}
> Calling f is ambiguous
However, if I change the main function to the following, clang-cl compiles the
code.
int main(int, char **)
{
long l = 42;
f(l);
return 0;
}
MSVC compiles both versions of the code.
I've also checked with:
static_assert(sizeof(int) == sizeof(long), "We expect int to be the same size
as long");
In both compilers, this assert evaluates to true.
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