Public bug reported:
While using a C++ compile time fixed_string library, I encountered an
issue with Ubuntu's version of GCC 14.
I tried a number of combinations:
* GCC-13, C++20: Pass
* GCC-13, C++23: Pass
* GCC-14, C++20: Pass
* GCC-14, C++23: Fail
Same results on both Ubuntu 24.04 (g++-14 14.2.0-4ubuntu2~24.04) and
Ubuntu 24.10 (g++-14 14.2.0-4ubuntu2).
Testing on another distro (OpenSUSE Tumbleweed,
gcc-c++-14-2.1.x86_64.rpm) all combinations passed.
Distro compiler versions reported by "g++-14 -v"
Ubuntu 24.04: gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2~24.04)
Ubuntu 24.10: gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2)
Tumbleweed: gcc version 14.2.1 20241007 [revision
4af44f2cf7d281f3e4f3957efce10e8b2ccb2ad3] (SUSE Linux)
I've stripped down the code in question to produce a minimal
reproducible example (see attachment).
Since the code works with GCC-14 on another distro, is Ubuntu's package
lacking upstream updates?
** Affects: gcc-14 (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Illustration of compilation failure on Ubuntu"
https://bugs.launchpad.net/bugs/2089259/+attachment/5839139/+files/ambiguous_ctad.cpp
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https://bugs.launchpad.net/bugs/2089259
Title:
GCC14 C++ CTAD failure due to ambiguous overload
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