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* [Bug c++/109422] New: wrong depth used for template parameter mangling for lambdas in function signatures
@ 2023-04-05 17:36 richard-gccbugzilla at metafoo dot co.uk
2023-04-05 17:39 ` [Bug c++/109422] " richard-gccbugzilla at metafoo dot co.uk
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: richard-gccbugzilla at metafoo dot co.uk @ 2023-04-05 17:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109422
Bug ID: 109422
Summary: wrong depth used for template parameter mangling for
lambdas in function signatures
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: richard-gccbugzilla at metafoo dot co.uk
Target Milestone: ---
Testcase:
struct C {
template<typename T>
void f(decltype([](T, auto) { return 0; })) {}
};
void g() { C().f<int>({}); }
GCC mangles f<int> as _ZN1C1fIiEEvDTtlNS_UlT_T_E_EEE -- note that this is
mangling / numbering the lambda directly within C, which is not permitted by
http://itanium-cxx-abi.github.io/cxx-abi/abi.html#closure-types but seems like
the best choice (see https://github.com/itanium-cxx-abi/cxx-abi/issues/165).
But the mangling of the <lambda-sig> as T_T_ is definitely wrong -- two
different template parameters should not be mangled the same. This should
instead be mangled as T_TL__ under
https://github.com/itanium-cxx-abi/cxx-abi/issues/31#issuecomment-528122117
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/109422] wrong depth used for template parameter mangling for lambdas in function signatures
2023-04-05 17:36 [Bug c++/109422] New: wrong depth used for template parameter mangling for lambdas in function signatures richard-gccbugzilla at metafoo dot co.uk
@ 2023-04-05 17:39 ` richard-gccbugzilla at metafoo dot co.uk
2023-10-10 21:23 ` cvs-commit at gcc dot gnu.org
2023-11-17 2:42 ` jason at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: richard-gccbugzilla at metafoo dot co.uk @ 2023-04-05 17:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109422
--- Comment #1 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> ---
> This should instead be mangled as T_TL__
Sorry, that's wrong; the rule we ended up with would mangle this as T_TL0__.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/109422] wrong depth used for template parameter mangling for lambdas in function signatures
2023-04-05 17:36 [Bug c++/109422] New: wrong depth used for template parameter mangling for lambdas in function signatures richard-gccbugzilla at metafoo dot co.uk
2023-04-05 17:39 ` [Bug c++/109422] " richard-gccbugzilla at metafoo dot co.uk
@ 2023-10-10 21:23 ` cvs-commit at gcc dot gnu.org
2023-11-17 2:42 ` jason at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-10-10 21:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109422
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:
https://gcc.gnu.org/g:bd5719bd7f7cb23e5ed96a1f1a28efbb3dec4a31
commit r14-4544-gbd5719bd7f7cb23e5ed96a1f1a28efbb3dec4a31
Author: Jason Merrill <jason@redhat.com>
Date: Fri Oct 6 11:41:20 2023 -0400
c++: mangle multiple levels of template parms [PR109422]
This becomes be more important with concepts, but can also be seen with
generic lambdas.
PR c++/109422
gcc/cp/ChangeLog:
* mangle.cc (write_template_param): Also mangle level.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/lambda-generic-mangle1.C: New test.
* g++.dg/cpp2a/lambda-generic-mangle1a.C: New test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/109422] wrong depth used for template parameter mangling for lambdas in function signatures
2023-04-05 17:36 [Bug c++/109422] New: wrong depth used for template parameter mangling for lambdas in function signatures richard-gccbugzilla at metafoo dot co.uk
2023-04-05 17:39 ` [Bug c++/109422] " richard-gccbugzilla at metafoo dot co.uk
2023-10-10 21:23 ` cvs-commit at gcc dot gnu.org
@ 2023-11-17 2:42 ` jason at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jason at gcc dot gnu.org @ 2023-11-17 2:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109422
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |14.0
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
CC| |jason at gcc dot gnu.org
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 14.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-04-05 17:36 [Bug c++/109422] New: wrong depth used for template parameter mangling for lambdas in function signatures richard-gccbugzilla at metafoo dot co.uk
2023-04-05 17:39 ` [Bug c++/109422] " richard-gccbugzilla at metafoo dot co.uk
2023-10-10 21:23 ` cvs-commit at gcc dot gnu.org
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