[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Andrew Pinski changed: What|Removed |Added CC||ian at geometrian dot com --- Comment #9 from Andrew Pinski --- *** Bug 108262 has been marked as a duplicate of this bug. ***
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Andrew Pinski changed: What|Removed |Added CC||liavonlida at gmail dot com --- Comment #8 from Andrew Pinski --- *** Bug 100742 has been marked as a duplicate of this bug. ***
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Andrew Pinski changed: What|Removed |Added CC||kip at thevertigo dot com --- Comment #7 from Andrew Pinski --- *** Bug 84055 has been marked as a duplicate of this bug. ***
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Andrew Pinski changed: What|Removed |Added CC||paul.groke at dynatrace dot com --- Comment #6 from Andrew Pinski --- *** Bug 82270 has been marked as a duplicate of this bug. ***
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Andrew Pinski changed: What|Removed |Added CC||myriachan at gmail dot com --- Comment #5 from Andrew Pinski --- *** Bug 84415 has been marked as a duplicate of this bug. ***
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Mateusz Zych changed: What|Removed |Added See Also||https://bugs.llvm.org/show_ ||bug.cgi?id=47674 --- Comment #4 from Mateusz Zych --- I just wanted to mention, that I raised issue in the Clang Bugzilla, since Clang is matching GCC behavior (also discards attributes): - https://bugs.llvm.org/show_bug.cgi?id=47674 Thanks, Mateusz
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Richard Smith changed: What|Removed |Added CC||richard-gccbugzilla@metafoo ||.co.uk --- Comment #3 from Richard Smith --- > would be interesting to see how ICC mangles the aligned case It doesn't, it just takes the properties from whichever instantiation happens to be performed first. On ICC, std::cout << alignof(typename identity::type) << std::endl; std::cout << alignof(typename identity::type) << std::endl; prints 4 4, and std::cout << alignof(typename identity::type) << std::endl; std::cout << alignof(typename identity::type) << std::endl; prints 16 16. The ICC behavior seems unsound, compared to the GCC / Clang behavior of (effectively) stripping the attribute from template arguments. > There is NO way defined at this point to mange for some attributes > including but not limited to may_alias and alignment. These can be mangled as s: http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.qualified-type Presumably the more problematic part from an ABI perspective is that this will change a bunch of existing manglings. Similarly from a source compatibility standpoint, making the alignment override part of the type would be a breaking change. It'd probably be better to add a new syntax for the new functionality (please, not based on an attributed typedef this time!) and deprecate the old way.
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 --- Comment #2 from Richard Biener --- would be interesting to see how ICC mangles the aligned case
[Bug c++/97222] GCC discards attributes aligned and may_alias for typedefs passed as template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97222 Andrew Pinski changed: What|Removed |Added Severity|normal |enhancement Keywords||ABI Last reconfirmed||2020-09-28 Status|UNCONFIRMED |SUSPENDED Ever confirmed|0 |1 --- Comment #1 from Andrew Pinski --- Actually this is more complex than what is mentioned here. THIS REQUIRES An ABI addition. Due to the way templates cause name managling to come into play. There is NO way defined at this point to mange for some attributes including but not limited to may_alias and alignment. Suspending until there is a definition of that defined.
