77 lines
2.4 KiB
CMake
77 lines
2.4 KiB
CMake
# Copyright (c) 2022 Universidade de Brasília
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License version 2 as published by the Free
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# Software Foundation;
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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# Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Author: Gabriel Ferreira <gabrielcarvfer@gmail.com>
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include(CheckCXXSourceCompiles)
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# Clang 6, 7 and 8 shipped with incomplete C++17 features and do not handle
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# ostream& operator<<(ostream& os, nullptr_t ptr)
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# https://gitlab.com/nsnam/ns-3-dev/-/issues/730
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check_cxx_source_compiles(
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"
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#include <iostream>
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#include <cstddef>
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inline std::ostream& operator << (std::ostream& os, std::nullptr_t ptr)
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{
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return os << \"nullptr\"; //whatever you want nullptr to show up as in the console
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}
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int main()
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{
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std::ostream os(NULL);
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os << std::nullptr_t();
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return 0;
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}
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"
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MISSING_OSTREAM_NULLPTR_OPERATOR
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)
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if(${MISSING_OSTREAM_NULLPTR_OPERATOR})
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message(
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${HIGHLIGHTED_STATUS}
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"Using compiler workaround: compiling in \"ostream& operator<<(ostream&, nullptr_t)\""
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)
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add_definitions(
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-include
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${CMAKE_CURRENT_SOURCE_DIR}/build-support/compiler-workarounds/ostream-operator-nullptr.h
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)
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endif()
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# Some compilers (e.g. GCC < 9.1 and Clang < 9) do not link
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# std::filesystem/std::experimental::filesystem by default. If the sample
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# program can be linked, it means it is indeed linked by default. Otherwise, we
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# link it manually. https://en.cppreference.com/w/cpp/filesystem
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check_cxx_source_compiles(
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"
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#ifdef __has_include
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#if __has_include(<filesystem>)
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#include <filesystem>
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namespace fs = std::filesystem;
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#elif __has_include(<experimental/filesystem>)
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#include <experimental/filesystem>
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namespace fs = std::experimental::filesystem;
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#else
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#error \"No support for filesystem library\"
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#endif
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#endif
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int main()
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{
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std::string path = \"/\";
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return !fs::exists(path);
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}
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"
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FILESYSTEM_LIBRARY_IS_LINKED
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)
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