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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [modules] error: constant expression not a constant expression"
href="https://bugs.llvm.org/show_bug.cgi?id=32186">32186</a>
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<th>Summary</th>
<td>[modules] error: constant expression not a constant expression
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Modules
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>I get the following errors with the following setup:
// t.h
template <typename T>
struct max {
static constexpr T val() noexcept { return T{10}; };
};
template <typename T>
static const constexpr T highest = max<T>::val();
// e.h
#pragma once
#include <t.h>
template <bool, typename A> struct if_ {};
template<typename A>
struct if_<true, A> {
using type = A;
};
template <unsigned N>
using dep_t
= typename if_<(N < highest<char>), unsigned>::type;
template <typename T, unsigned Capacity>
struct bar {
using size_type = dep_t<Capacity>;
};
template<typename T,
typename U = if_< sizeof(T) < highest<T>, T>
>
auto foo(T a) {
return bar<T, 100>{};
}
// main.cpp
#include <e.h>
int main() {
auto c = foo(long{0});
return 0;
}
// module.modulesmap
module t { header "t.h" export * }
module e { header "e.h" export * }</pre>
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