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In microsoft mode, delay default template argument checking until template definition time #13077

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nico opened this issue Apr 30, 2012 · 6 comments
Closed

In microsoft mode, delay default template argument checking until template definition time #13077

nico opened this issue Apr 30, 2012 · 6 comments
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bugzilla Issues migrated from bugzilla c++

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@nico
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nico commented Apr 30, 2012

Bugzilla Link 12705
Resolution FIXED
Resolved on Aug 11, 2014 11:48
Version unspecified
OS Windows NT
Blocks llvm/llvm-bugzilla-archive#13707
CC @majnemer,@DougGregor,@zmodem,@tritao,@rnk

Extended Description

template<class T, class S = Foo>
class Class;

class Foo {};

template<class T, class S>
class Class {
};

C:\src\chrome\src>cl test.cc /c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.30319.01 for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.

test.cc

C:\src\chrome\src>....\llvm-build\bin\Release\clang.exe -c test.cc
test.cc:1:29: error: unknown type name 'Foo'
template<class T, class S = Foo>
^
1 error generated.

This is required to parse atlwin.h
@nico
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nico commented Jun 25, 2012

cl also accepts:

template<class T, class S = Foo>
class Class;

template<class T, class S>
class Class {
};

class Foo {};

void f() {
Class c;
}

It doesn't accept:

template<class T, class S = Foo>
class Class;

template<class T, class S>
class Class {
};

void f() {
Class c;
}

class Foo {};

@zmodem
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zmodem commented Jun 3, 2013

*** Bug llvm/llvm-bugzilla-archive#16180 has been marked as a duplicate of this bug. ***

@rnk
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rnk commented Aug 11, 2014

This was fixed in r210382, we accept with a warning:

$ clang -c t.cpp
t.cpp:1:29: warning: using the undeclared type 'Foo' as a default template argument is a Microsoft extension [-Wmicrosoft]
template<class T, class S = Foo>
^
1 warning generated.

@tritao
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Mannequin

tritao mannequin commented Nov 26, 2021

mentioned in issue llvm/llvm-bugzilla-archive#13707

@zmodem
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zmodem commented Nov 26, 2021

mentioned in issue llvm/llvm-bugzilla-archive#16180

@rnk
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rnk commented Nov 26, 2021

mentioned in issue llvm/llvm-bugzilla-archive#18714

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
@tritao tritao mannequin mentioned this issue Nov 3, 2023
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@nico @rnk @zmodem