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QuantLib expects Boost ver. ≥1.75.0 for CXX ≥20 but Linux fetches 1.74.0 with `sudo apt install -y libboost-dev ccache ninja-build`:
```
CMake Error at /usr/local/share/cmake-3.30/Modules/FindPack…
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### Steps to reproduce the issue
```console
$ spack install hpx cxxstd=20
$ cd $(spack find --paths hpx | awk '/hpx/{print $2}')
$ grep HPX_WITH_CXX20 .spack/spack-build-out.txt
```
### Erro…
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For alias CTAD, if an explicit deduction guide is written after the first use of the alias template, this deduction guide is not included.
The upcoming CTAD for inherited constructors (#98788) also …
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```
namespace cxx20 {
template struct A {};
void f(A) {}
};
```
Is mangled as `_ZN5cxx201fENS_1AILd3ff0000000000000EEE`.
For a Visual Studio 2019 build llvm-cxxfilt demangles as `cxx20::f…
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Long `requires` clauses wrapped in the `DEAL_II_CXX20_REQUIRES` macro are barely readable:
```
template
DEAL_II_CXX20_REQUIRES(
(concepts::is_dealii_petsc_vector_type ||
std::constr…
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using clang-cl with `/Zc:twoPhase-`
and
`#pragma clang diagnostic ignored "-Wdelayed-template-parsing-in-cxx20"`
but
clang-cl still emits
`clang-cl: warning: -fdelayed-template-parsing is d…
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Build fine with makepkg instead, not sure what is causing this
GCC is always installed in this situation
```
-- Performing Test HAVE_REQUIRED_CXX20_SUPPORT
-- Performing Test HAVE_REQUIRED_CXX…
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For people who compile using C++20, we could add optional `std::span` throughout our API *when* C++20 is detected.
This is not very difficult, but it would require extra documentation and testing.
…
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Hi,
Bond failed to build due to error C2027 and error C2061 with msvc option /std:c++latest. Could you take a look this issue? Thanks~
**Repro steps:**
1. Open a x64 Native Tools Command Prompt f…
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See log file. Relevant part
```
CMake Error in src/CMakeLists.txt:
Target "regex_perf" requires the language dialect "CXX20" (with compiler
extensions), but CMake does not know the compile f…