On 30 Oct 2024, at 16:06, Brian Inglis via Cygwin <cygwin@cygwin.com> wrote:
> Trying to update a package using c++ (requires gcc 12.4+ for adequate c++
> 2020 support) and getting confusing error messages.
>
> It appears that noexcept in the header files may here redefined by the
> compiler or headers as __GLIBC_NOEXCEPT.
> Those errors look to me like a failure to detect that *glibc* is not
> available.
> Or is *GLIBCXX* actually *glib* for *cxx*, so this could be a library or
> compiler issue?
>
> It appears that str::size() should be a constexpr but something messes it up.
> Or is something else going on here?
As far as I can determine, even a simple example does not work for gcc 12:
#include<string>
#include<cassert>
constexpr bool foo()
{
std::string str2{"abcwe"};
return str2.size()==5;
}
static_assert(foo());
int main()
{
assert(foo());
}
As far as I know, there is no gcc 13 for Cygwin yet, but on Linux and FreeBSD
this does compile with gcc 13.
-Dimitry
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