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Bug 906783 - Attempt to detect the standard C++ library version, r=Waldo
This commit is contained in:
Joshua Cranmer
parent
df9126512e
commit
642e66f518
@ -18,6 +18,7 @@
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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Compiler.h"
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#include "mozilla/TypeTraits.h"
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#include <stdint.h>
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@ -27,34 +28,16 @@
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* does not have <atomic>. So be sure to check for <atomic> support
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* along with C++0x support.
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*/
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#if defined(__clang__)
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#if defined(__clang__) || defined(__GNUC__)
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/*
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* clang doesn't like libstdc++'s version of <atomic> before GCC 4.7,
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* due to the loose typing of the __sync_* family of functions done by
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* GCC. We do not have a particularly good way to detect this sort of
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* case at this point, so just assume that if we're on a Linux system,
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* we can't use the system's <atomic>.
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*
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* OpenBSD uses an old libstdc++ 4.2.1 and thus doesnt have <atomic>.
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* Clang doesn't like <atomic> from libstdc++ before 4.7 due to the
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* loose typing of the atomic builtins. GCC 4.5 and 4.6 lacks inline
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* definitions for unspecialized std::atomic and causes linking errors.
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* Therefore, we require at least 4.7.0 for using libstdc++.
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*/
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# if !defined(__linux__) && !defined(__OpenBSD__) && \
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(__cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)) && \
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__has_include(<atomic>)
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# if MOZ_USING_LIBSTDCXX && MOZ_LIBSTDCXX_VERSION_AT_LEAST(4, 7, 0)
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# define MOZ_HAVE_CXX11_ATOMICS
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# endif
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/*
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* Android uses a different C++ standard library that does not provide
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* support for <atomic>.
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*
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* GCC 4.5.x and 4.6.x's unspecialized std::atomic template doesn't include
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* inline definitions for the functions declared therein. This oversight
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* leads to linking errors when using atomic enums. We therefore require
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* GCC 4.7 or higher.
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*/
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#elif defined(__GNUC__) && !defined(__ANDROID__)
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# include "mozilla/Compiler.h"
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# if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L) && \
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MOZ_GCC_VERSION_AT_LEAST(4, 7, 0)
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# elif MOZ_USING_LIBCXX
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# define MOZ_HAVE_CXX11_ATOMICS
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# endif
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#elif defined(_MSC_VER) && _MSC_VER >= 1700
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@ -29,4 +29,77 @@
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#endif
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/*
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* The situation with standard libraries is a lot worse than with compilers,
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* particularly as clang and gcc could end up using one of three or so standard
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* libraries, and they may not be up-to-snuff with newer C++11 versions. To
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* detect the library, we're going to include cstddef (which is a small header
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* which will be transitively included by everybody else at some point) to grab
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* the version macros and deduce macros from there.
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*/
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#ifdef __cplusplus
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# include <cstddef>
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# ifdef _STLPORT_MAJOR
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# define MOZ_USING_STLPORT 1
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# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) \
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(_STLPORT_VERSION >= ((major) << 8 | (minor) << 4 | (patch)))
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# elif defined(__LIBCPP_VERSION)
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/*
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* libc++, unfortunately, doesn't appear to have useful versioning macros.
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* Hopefully, the recommendations of N3694 with respect to standard libraries
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* will get applied instead and we won't need to worry about version numbers
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* here.
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*/
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# define MOZ_USING_LIBCXX 1
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# elif defined(__GLIBCXX__)
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# define MOZ_USING_LIBSTDCXX 1
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/*
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* libstdc++ is also annoying and doesn't give us useful versioning macros
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* for the library. If we're using gcc, then assume that libstdc++ matches
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* the compiler version. If we're using clang, we're going to have to fake
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* major/minor combinations by looking for newly-defined config macros.
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*/
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# if MOZ_IS_GCC
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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MOZ_GCC_VERSION_AT_LEAST(major, minor, patch)
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# elif defined(_GLIBCXX_THROW_OR_ABORT)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 8))
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# elif defined(_GLIBCXX_NOEXCEPT)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 7))
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# elif defined(_GLIBCXX_USE_DEPRECATED)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 6))
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# elif defined(_GLIBCXX_PSEUDO_VISIBILITY)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 5))
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# elif defined(_GLIBCXX_BEGIN_EXTERN_C)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 4))
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# elif defined(_GLIBCXX_VISIBILITY_ATTR)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 3))
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# elif defined(_GLIBCXX_VISIBILITY)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 2))
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# else
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# error "Your version of libstdc++ is unknown to us and is likely too old."
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# endif
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# endif
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// Flesh out the defines for everyone else
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# ifndef MOZ_USING_STLPORT
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# define MOZ_USING_STLPORT 0
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# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) 0
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# endif
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# ifndef MOZ_USING_LIBCXX
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# define MOZ_USING_LIBCXX 0
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# endif
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# ifndef MOZ_USING_LIBSTDCXX
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# define MOZ_USING_LIBSTDCXX 0
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) 0
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# endif
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#endif /* __cplusplus */
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#endif /* mozilla_Compiler_h */
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