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Merge pull request #308 from Kojoley/use-version-include

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Use <version> to determine standard library
This commit is contained in:
jzmaddock
2020-01-24 18:07:23 +00:00
committed by GitHub
parent e7ab8753d2 26f20bd8e5
commit 94f7da0e5e
1 changed files with 13 additions and 2 deletions
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15
include/boost/config/detail/select_stdlib_config.hpp
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@ -11,10 +11,21 @@
// locate which std lib we are using and define BOOST_STDLIB_CONFIG as needed:
// First include <cstddef> to determine if some version of STLport is in use as the std lib
// First, check if __has_include is available and <version> include can be located,
// otherwise include <cstddef> to determine if some version of STLport is in use as the std lib
// (do not rely on this header being included since users can short-circuit this header
// if they know whose std lib they are using.)
#ifdef __cplusplus
#if defined(__cplusplus) && defined(__has_include)
# if __has_include(<version>)
// It should be safe to include `<version>` when it is present without checking
// the actual C++ language version as it consists solely of macro definitions.
// [version.syn] p1: The header <version> supplies implementation-dependent
// information about the C++ standard library (e.g., version number and release date).
# include <version>
# else
# include <cstddef>
# endif
#elif defined(__cplusplus)
# include <cstddef>
#else
# include <stddef.h>