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d4c3da3d2f
This fixes a copy-paste error introduced in r397043 ("Update the Qt4 ports to
4.8.7"): libc++ defines _LIBCPP_VERSION, not _LIBCPP_VER (which is defined by a
Dinkumware-based standard library used by QNX). In practice, this meant
Q_COMPILER_INITIALIZER_LISTS was never being enabled with clang.
Submitted by: Tobias Berner <tcberner@gmail.com>
36 lines
1.6 KiB
C
36 lines
1.6 KiB
C
clang: Only enable Q_COMPILER_INITIALIZER_LISTS with libc++.
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This is a workaround for the FreeBSD 9.x series: in Qt 4.8.7, C++11 features
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are detected by checking if the compiler supports them. However, initializer
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lists support also depends on the C++ standard library. 9.x's libstdc++ from
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base (GCC 4.2) does not, so ports with e.g. USES=compiler:c++0x or
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compiler:c++11-lang would break: they build with clang and base's libstdc++, so
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Qt considers the support is there (including the C++ header) while this is not
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the case.
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Work around the problem by only enabling Q_COMPILER_INITIALIZER_LISTS if libc++
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is being used. Detecting libstdc++'s version is too cumbersome (we would at
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least need to include a non-lightweight header such as cstdio to have access to
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__GLIBCXX__) and not worth the effort.
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--- src/corelib/global/qglobal.h
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+++ src/corelib/global/qglobal.h
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@@ -854,7 +855,18 @@ namespace QT_NAMESPACE {}
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# define Q_COMPILER_DEFAULT_DELETE_MEMBERS
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# endif
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# if __has_feature(cxx_generalized_initializers)
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-# define Q_COMPILER_INITIALIZER_LISTS
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+/*
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+ * Workaround for FreeBSD 9.x, where we can end up building a port with clang
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+ * and base's libstdc++ from GCC 4.2 (which does not support initializer
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+ * lists). Since detecting libstdc++'s version is not trivial, only enable the
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+ * macro with libc++.
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+ */
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+# if defined(__cplusplus) /* Only C++ has ciso646. */
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+# include <ciso646>
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+# if defined(_LIBCPP_VERSION)
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+# define Q_COMPILER_INITIALIZER_LISTS
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+# endif
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+# endif
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# endif
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# if __has_feature(cxx_lambdas)
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# define Q_COMPILER_LAMBDA
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