https://bugs.llvm.org/show_bug.cgi?id=47383
Bug ID: 47383
Summary: Odd "argument deduction not allowed in function return
type" when initializing static data member
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: stephan.bergmann.second...@googlemail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
At least with recent Clang 12 trunk and with clang-10.0.0-2.fc32.x86_64:
> $ cat test.cc
> template<int N> struct S1 { constexpr S1(char const (&)[N]) {} };
> struct S2 { static constexpr S1 s(""); };
> $ clang++ -std=c++17 -fsyntax-only test.cc
> test.cc:2:35: error: expected parameter declarator
> struct S2 { static constexpr S1 s(""); };
> ^
> test.cc:2:35: error: expected ')'
> test.cc:2:34: note: to match this '('
> struct S2 { static constexpr S1 s(""); };
> ^
> test.cc:2:30: error: use of class template 'S1' requires template arguments;
> argument deduction not allowed in function return type
> struct S2 { static constexpr S1 s(""); };
> ^~
> test.cc:1:24: note: template is declared here
> template<int N> struct S1 { constexpr S1(char const (&)[N]) {} };
> ^
> 3 errors generated.
Compilation succeeds when replacing the complete second line with either
> struct S2 { static constexpr S1 s = ""; };
or
> static constexpr S1 s("");
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