https://llvm.org/bugs/show_bug.cgi?id=27457
Bug ID: 27457
Summary: Possible regression: "invalid explicitly-specified
argument" on enum value as template parameter
Product: clang
Version: 3.6
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: trpri...@synopsys.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org,
sig-rnd-sat-clang-b...@synopsys.com
Classification: Unclassified
Some time prior to clang 3.6.2, clang accepted the following snippet, but now
rejects it:
$ cat t.cpp
enum MyEnum { e };
class A {};
template <MyEnum> void foo(A) { }
#ifndef HIDE
template <int> void foo(int) { }
#endif
void bar() { foo<e>(A()); }
$
Clang 3.5:
$ clang-3.5 -v
clang version 3.5.2 (tags/RELEASE_352/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$ clang-3.5 -c t.cpp
$
Clang 3.6:
$ clang-3.6 -v
clang version 3.6.2 (tags/RELEASE_362/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$ clang-3.6 -c t.cpp
t.cpp:7:14: error: no matching function for call to 'foo'
void bar() { foo<e>(A()); }
^~~~~~
t.cpp:5:21: note: candidate function [with $0 = 0] not viable: no known
conversion from 'A' to 'int' for 1st argument
template <int> void foo(int) { }
^
t.cpp:3:24: note: candidate template ignored: invalid explicitly-specified
argument for 1st template parameter
template <MyEnum> void foo(A) { }
^
1 error generated.
$
When the second template is omitted, both clang versions accept the snippet:
$ clang-3.5 -DHIDE -c t.cpp
$ clang-3.6 -DHIDE -c t.cpp
$
I can reproduce this with a recent svn build as well.
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