http://llvm.org/bugs/show_bug.cgi?id=16329
Bug ID: 16329
Summary: undefined-inline warning when constexpr is used
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
stephen@hal:/tmp$ clang++ --version
Ubuntu clang version 3.2-1~exp9ubuntu1 (tags/RELEASE_32/final) (based on LLVM
3.2)
Target: x86_64-pc-linux-gnu
Thread model: posix
stephen@hal:/tmp$ clang++ -std=c++11 -DUSE_CONSTEXPR -c test.cpp
stephen@hal:/tmp$ clang++ -std=c++11 -c test.cpp
stephen@hal:/tmp$ ~/dev/build/qtbase/llvm/bin/clang++ --version
clang version 3.4
Target: x86_64-unknown-linux-gnu
Thread model: posix
stephen@hal:/tmp$ ~/dev/build/qtbase/llvm/bin/clang++ -std=c++11
-DUSE_CONSTEXPR -c test.cpp
test.cpp:9:20: warning: inline function 'typeId<A>' is not defined
[-Wundefined-inline]
DECL_CONSTEXPR int typeId();
^
test.cpp:19:15: note: used here
(void)typeId<A>();
^
1 warning generated.
stephen@hal:/tmp$ ~/dev/build/qtbase/llvm/bin/clang++ -std=c++11 -c test.cpp
stephen@hal:/tmp$ g++ --version
g++ (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
stephen@hal:/tmp$ g++ -std=c++11 -DUSE_CONSTEXPR -c test.cpp
stephen@hal:/tmp$ g++ -std=c++11 -c test.cpp
stephen@hal:/tmp$ cat test.cpp
#ifdef USE_CONSTEXPR
#define DECL_CONSTEXPR constexpr
#else
#define DECL_CONSTEXPR
#endif
template <typename T>
DECL_CONSTEXPR int typeId();
struct A {};
template<typename T>
struct Template
{
static void registerType(T t)
{
t.does_not_compile;
(void)typeId<A>();
}
};
template <typename T>
DECL_CONSTEXPR int typeId()
{
return 0;
}
void avoidWarning()
{
// (void)typeId<A>();
}
The warning is not emitted if the contents of avoidWarning are uncommented.
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