Re: [PATCH 5/9] build: reject C++ compilers that don't support std::vector::data

[Hans Åberg]

> On 13 Aug 2021, at 08:11, Akim Demaille <akim.demaille@gmail.com> wrote:
> 
>> Le 12 août 2021 à 10:40, Hans Åberg <haberg-1@telia.com> a écrit :
>> 
>>> On 12 Aug 2021, at 10:18, Akim Demaille <akim.demaille@gmail.com> wrote:
>>> 
>>> GCC 4.2 on macOS claims to support C++98, but does not feature it.
>>> 
>>> input.cc: In member function 'void state_stack::yycompressStack()':
>>> input.cc:1774: error: 'class std::vector<glr_stack_item, 
>>> std::allocator<glr_stack_item> >' has no member named 'data'
>> 
>> The member 'data' was introduced in C++11.
>> 
>> https://en.cppreference.com/w/cpp/container/vector/data
> 
> That page is exactly the one I looked at first to see that it's C++98, not 
> C++11.  Read the bottom of 
> <https://en.cppreference.com/w/cpp/container/vector>.

It is not in the C++98 ISO+IEC+14882-1998 standard (the PDF). In the C++11 
n3242 draft, in sec. 23.3.6.1 Class template vector overview, class vector has 
between sections "element access" and "modifiers" a section "data access" with
  T* data() noexcept; const
  T* data() const noexcept
and it is also in a C++ draft standard I made from sources in 2015.

So GCC is right on this one, and 4.2 is from 2007-2008, before C++11. You might 
try a later version with the -std=c++98 option to see what it does.