qversiontagging.h: remove the attempt to use the "retain" attribute
GCC 11 knows about it, meaning __has_attribute(retain) = 1 regardless of whether GCC can emit code for it. Clang has a similar limitation. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99587 Fixes: QTBUG-101753 Change-Id: Ic30914a4448d4bc28974fffd16dce9a78cdefe5b Reviewed-by: Marc Mutz <marc.mutz@qt.io>
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@ -137,11 +137,7 @@ struct QVersionTag
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# ifdef Q_OS_DARWIN
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# define QT_VERSION_TAG_SECTION __attribute__((section("__DATA,.qtversion")))
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# endif
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# if __has_attribute(retain)
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# define QT_VERSION_TAG_ATTRIBUTE __attribute__((visibility("hidden"), retain, used))
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# else
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# define QT_VERSION_TAG_ATTRIBUTE __attribute__((visibility("hidden"), used))
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# endif
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# define QT_VERSION_TAG_ATTRIBUTE __attribute__((visibility("hidden"), used))
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# define QT_VERSION_TAG2(sym, imp) \
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extern "C" Q_DECL_IMPORT const char sym; \
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QT_VERSION_TAG_ATTRIBUTE QT_VERSION_TAG_SECTION constexpr inline QtPrivate::QVersionTag sym ## _use(&sym)
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