failure to build on OpenIndiana g++14

Describe the bug
Build failure.

And link failure if replacing with std::isnan.

Expected behavior
It building and linking properly.

Reproduction steps
Steps to reproduce the bug.

• install OpenIndiana/some illumos-based distro with this specific gcc version
• sudo pkg install gcc-14
• git clone --depth=1 https://github.com/catchorg/Catch2
• cd Catch2
• cmake -DCMAKE_BUILD_TYPE=Release -B build
• cmake --build build -- -j128

Platform information:

• OS: OpenIndiana
• Compiler+version: GCC v14.3.0
• Catch version: latest git

Additional context
I solved the issue by replacing with std::isnan, but it didn't make the linker happy either, Replacing Catch::isnan for std::isnan in catch_tostring.cpp makes it compile and link just fine.

[horenmar]

Try different version of GCC I guess. This works on all platforms and compilers in our CI, and Catch::isnan symbol obviously exists in the relevant file.

Catch::isnan is declared in catch_polyfills.hpp:

//              Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
//   (See accompanying file LICENSE.txt or copy at
//        https://www.boost.org/LICENSE_1_0.txt)

// SPDX-License-Identifier: BSL-1.0
#ifndef CATCH_POLYFILLS_HPP_INCLUDED
#define CATCH_POLYFILLS_HPP_INCLUDED

namespace Catch {

    bool isnan(float f);
    bool isnan(double d);

    float nextafter(float x, float y);
    double nextafter(double x, double y);

}

#endif // CATCH_POLYFILLS_HPP_INCLUDED

and this is the start of catch_matchers_floating_point.cpp

#include <catch2/matchers/catch_matchers_floating_point.hpp>
#include <catch2/internal/catch_enforce.hpp>
---> #include <catch2/internal/catch_polyfills.hpp> <---
#include <catch2/internal/catch_to_string.hpp>
#include <catch2/catch_tostring.hpp>
#include <catch2/internal/catch_floating_point_helpers.hpp>

Try different version of GCC I guess. This works on all platforms and compilers in our CI, and Catch::isnan symbol obviously exists in the relevant file.

Catch::isnan is declared in catch_polyfills.hpp:

// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)

// SPDX-License-Identifier: BSL-1.0
#ifndef CATCH_POLYFILLS_HPP_INCLUDED
#define CATCH_POLYFILLS_HPP_INCLUDED

namespace Catch {

bool isnan(float f);
bool isnan(double d);

float nextafter(float x, float y);
double nextafter(double x, double y);

}

#endif // CATCH_POLYFILLS_HPP_INCLUDED

and this is the start of catch_matchers_floating_point.cpp

#include <catch2/matchers/catch_matchers_floating_point.hpp>
#include <catch2/internal/catch_enforce.hpp>
---> #include <catch2/internal/catch_polyfills.hpp> <---
#include <catch2/internal/catch_to_string.hpp>
#include <catch2/catch_tostring.hpp>
#include <catch2/internal/catch_floating_point_helpers.hpp>

Putting the #include <catch2/internal/catch_polyfills.hpp> atop all includes fixed the issue