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* [Bug c++/96445] New: extern template results in missing constructor symbol
@ 2020-08-03 19:57 tyu at eridex dot org
2020-08-04 6:03 ` [Bug c++/96445] " rguenth at gcc dot gnu.org
2022-02-18 20:33 ` tyu at eridex dot org
0 siblings, 2 replies; 3+ messages in thread
From: tyu at eridex dot org @ 2020-08-03 19:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96445
Bug ID: 96445
Summary: extern template results in missing constructor symbol
Product: gcc
Version: 10.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tyu at eridex dot org
Target Milestone: ---
Created attachment 48989
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48989&action=edit
g++ -v output
The following results in: undefined reference to `C<int>::C(int)'
template <typename T>
class C {
private:
constexpr C(T){};
public:
constexpr static C<T> make(T t) { return C<T>(t); }
};
extern template class C<int>;
inline constexpr C<int> constant = C<int>::make(0);
template class C<int>;
int main() { return 0; }
Compiled with:
$ g++ -v -save-temps -std=c++2a -Wall -Wextra issue.cpp > output.txt 2>&1
output.txt is attached.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/96445] extern template results in missing constructor symbol
2020-08-03 19:57 [Bug c++/96445] New: extern template results in missing constructor symbol tyu at eridex dot org
@ 2020-08-04 6:03 ` rguenth at gcc dot gnu.org
2022-02-18 20:33 ` tyu at eridex dot org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-08-04 6:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96445
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |link-failure
CC| |jason at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
extern template class C<int>;
template class C<int>;
combo probably does not instanitate C<int>.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/96445] extern template results in missing constructor symbol
2020-08-03 19:57 [Bug c++/96445] New: extern template results in missing constructor symbol tyu at eridex dot org
2020-08-04 6:03 ` [Bug c++/96445] " rguenth at gcc dot gnu.org
@ 2022-02-18 20:33 ` tyu at eridex dot org
1 sibling, 0 replies; 3+ messages in thread
From: tyu at eridex dot org @ 2022-02-18 20:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96445
--- Comment #2 from tyu at eridex dot org ---
The extern template and constant are what would appear in the header file for
class C. The explicit instantiation would appear in the source file:
// -- C.h ------------
template <typename T>
class C {
private:
constexpr C(T){};
public:
constexpr static C<T> make(T t) { return C<T>(t); }
};
extern template class C<int>;
inline constexpr C<int> constant = C<int>::make(0);
// -- C.cpp ----------
template class C<int>;
// -- main.cpp -------
int main() { return 0; }
// -------------------
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-08-03 19:57 [Bug c++/96445] New: extern template results in missing constructor symbol tyu at eridex dot org
2020-08-04 6:03 ` [Bug c++/96445] " rguenth at gcc dot gnu.org
2022-02-18 20:33 ` tyu at eridex dot org
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