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

> On 13 Aug 2021, at 08:11, Akim Demaille <[email protected]> =
wrote:
>=20
>> Le 12 ao=C3=BBt 2021 =C3=A0 10:40, Hans =C3=85berg =
<[email protected]> a =C3=A9crit :
>>=20
>>> On 12 Aug 2021, at 10:18, Akim Demaille <[email protected]> =
wrote:
>>>=20
>>> GCC 4.2 on macOS claims to support C++98, but does not feature it.
>>>=20
>>> 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'
>>=20
>> The member 'data' was introduced in C++11.
>>=20
>> https://en.cppreference.com/w/cpp/container/vector/data
>=20
> 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=3Dc++98 option to see what =
it does.