https://bugs.llvm.org/show_bug.cgi?id=43775
Bug ID: 43775
Summary: Wc++98-compat + CTAD = bogus warning about 'auto' when
no 'auto' appears in the code
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
cat >test.cc <<EOF
// https://godbolt.org/z/5x5V5v
template<class T> struct S {};
void f() {
S<int> s;
S t = s;
}
EOF
clang++ -std=c++17 -Wc++98-compat test.cc
The codegen is fine, but the first warning issued is both redundant AND
technically incorrect. No 'auto' type specifier exists in this code, so Clang
really shouldn't be warning about any 'auto' type specifier.
===
test.cc:4:5: warning: 'auto' type specifier is incompatible with C++98
[-Wc++98-compat]
S t = s;
^
test.cc:4:5: warning: class template argument deduction is incompatible with
C++ standards before C++17; for compatibility, use explicit type name 'S<int>'
[-Wc++98-c++11-c++14-compat]
S t = s;
^
2 warnings generated.
===
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