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Improve error message on standalone if missing Boost.Config #491

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Sep 1, 2022
Merged

Improve error message on standalone if missing Boost.Config #491

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15 changes: 13 additions & 2 deletions include/boost/multiprecision/detail/standalone_config.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11,9 +11,20 @@
#define BOOST_MP_STANDALONE_CONFIG_HPP

#include <climits>

// Boost.Config is dependency free so it is considered a requirement to use Boost.Multiprecision in standalone mode
#include <boost/config.hpp>
#include <boost/config/workaround.hpp>
#ifdef __has_include
# if __has_include(<boost/config.hpp>)
# include <boost/config.hpp>
# include <boost/config/workaround.hpp>
# else
# error "Boost.Config is considered a requirement to use Boost.Multiprecision in standalone mode. A package is provided at https://github.com/boostorg/multiprecision/releases"
# endif
#else
// Provides the less helpful fatal error: 'boost/config.hpp' file not found if not available
# include <boost/config.hpp>
# include <boost/config/workaround.hpp>
#endif

// Minimum language standard transition
#ifdef _MSVC_LANG
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