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a8713d15f4
- Enable `long double` C99 math usage - Switch 9.x back to building with GCC Changes: http://www.boost.org/users/history/ PR: 199601 Submitted by: Chen Xu, bapt, amdmi3, truckman (based on) Reviewed by: rakuco (kde) (earlier version) Exp-run by: antoine (3 tries), truckman (consumers only, earlier versions) Approved by: bapt (office)
34 lines
1 KiB
C++
34 lines
1 KiB
C++
--- boost/config/compiler/clang.hpp.orig 2016-09-21 14:33:21 UTC
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+++ boost/config/compiler/clang.hpp
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@@ -110,6 +110,16 @@
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# endif
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#endif
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+//
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+// Pick up _LIBCPP_VERSION definition if we are using libc++
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+// If _LIBCPP_VERSION is not defined, then we will assume that
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+// we are compiling on FreeBSD 9.x and using ancient libstdc++
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+// from base gcc 4.2 with limited c++11 support.
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+//
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+#ifdef __cplusplus
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+# include <ciso646>
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+#endif
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+
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#if !__has_feature(cxx_auto_type)
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# define BOOST_NO_CXX11_AUTO_DECLARATIONS
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# define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
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@@ -192,7 +202,13 @@
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# define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
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#endif
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-#if !__has_feature(cxx_rvalue_references)
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+//
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+// clang on FreeBSD 9.x uses libstdc++ from base GCC 4.2.1 which
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+// does not support std::forward which this feature requires.
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+// Assume that the lack of a _LIBCPP_VERSION definition indicates
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+// that is our environment.
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+//
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+#if !__has_feature(cxx_rvalue_references) || !defined(_LIBCPP_VERSION)
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# define BOOST_NO_CXX11_RVALUE_REFERENCES
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#endif
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