Re: boost.gil build failed with GCC11 and -std=c++20

From: Mateusz Loskot (mateusz_at_[hidden])
Date: 2022-01-07 20:09:21

On Fri, 7 Jan 2022, 15:25 Qiang Ren via Boost-users, <
boost-users_at_[hidden]> wrote:

> Hi,
>
> I am on ubuntu 20.04, I have GCC9.4 and 10.3 and 11.1 installed.
>
> I found that when set "-std=c++20", with gcc11, boost.gil will failed to
> build.
>
> Here is the simple test cpp to reproduce the issue:
>
> #include <sstream>
> #include <boost/gil.hpp>
> #include <boost/gil/extension/io/png.hpp>
>
> namespace gil = boost::gil;
>
> int main()
> {
>   gil::rgb8_image_t img;
>   std::stringstream buf(std::ios::in | std::ios::out | std::ios::binary);
>   gil::read_and_convert_image(buf, img, gil::png_tag{});
>
>   return 0;
> }
>
> the build command is:
> g++ -o test test_gcc11_gil.cc -std=c++20
> -I${THIRD_PARTY}/boost/boost_1_78_0 -L${THIRD_PARTY}/libpng/1.6.37/lib/
> -lpng
>
> If replaced '-std=c++20' with '-std=c++17', the build would be OK,  but
> with 'c++20', gcc 11 failed with the following errors:
>
> In file included from
> /data/lin/ThirdParty/boost/boost_1_78_0/boost/gil/extension/io/png/read.hpp:13,
> from
> /data/lin/ThirdParty/boost/boost_1_78_0/boost/gil/extension/io/png.hpp:11,
> from test_gcc11_gil.cc:3:
> /data/lin/ThirdParty/boost/boost_1_78_0/boost/gil/extension/io/png/tags.hpp:576:32:
> error: expected unqualified-id before ‘)’ token
> 576 |     image_read_info< png_tag >()
> |                                ^
>

https://github.com/boostorg/gil/issues/616

Best regards,
Mateusz

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