https://bugs.llvm.org/show_bug.cgi?id=44207
Bug ID: 44207
Summary: [msabi] wrong mangling for auto-typed non-type
template parameters
Product: clang
Version: trunk
Hardware: PC
OS: Windows XP
Status: NEW
Severity: normal
Priority: P
Component: C++17
Assignee: unassignedclangb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk,
r...@google.com
Clang incorrectly mangles non-type template parameters whose types involve
`auto` when targeting the MS ABI. Testcase:
template<auto *P> struct X {};
int a;
void f(X<&a>) {}
void f(X<(const int*)&a>) {}
MSVC mangles these as:
?f@@YAXU?$X@$MPEAH1?a@@3HA@@@Z
?f@@YAXU?$X@$MPEBH1?a@@3HA@@@Z
Clang wants to mangle them both as:
?f@@YAXU?$X@$1?a@@3HA@@@Z
In practice, Clang rejects both of the above in Sema before getting to
mangling, but commenting out either of the definitions of 'f' results in a
program for which Clang generates wrong manglings under the MS ABI:
https://godbolt.org/z/xDDuD7
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