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qglobal: add a way to selectively export in Qt 6 XOR Qt 7

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Because at least one compiler *cough*MSVC*cough* is unable to dllexport
a method that is in a dllexport'ed class.

Change-Id: I54f205f6b7314351b078fffd16d06b4e6ef0c086
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Thiago Macieira 2022-02-03 15:44:08 -08:00
parent 0e84d04b90
commit ea89d0a36c
2 changed files with 21 additions and 1 deletions
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4
doc/global/qt-cpp-defines.qdocconf
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@ -208,7 +208,9 @@ Cpp.ignoredirectives += \
QT_WARNING_DISABLE_INTEL \
QT_WARNING_DISABLE_MSVC \
Q_ATTRIBUTE_FORMAT_PRINTF \
Q_MV_IOS
Q_MV_IOS \
QT6_ONLY \
QT7_ONLY
# Qt 6: Remove
falsehoods += \

18
src/corelib/global/qglobal.h
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@ -107,6 +107,24 @@
#define QT_CONFIG(feature) (1/QT_FEATURE_##feature == 1)
#define QT_REQUIRE_CONFIG(feature) Q_STATIC_ASSERT_X(QT_FEATURE_##feature == 1, "Required feature " #feature " for file " __FILE__ " not available.")
/*
helper macros to make some simple code work active in Qt 6 or Qt 7 only,
like:
struct QT6_ONLY(Q_CORE_EXPORT) QTrivialClass
{
void QT7_ONLY(Q_CORE_EXPORT) void operate();
}
*/
#if QT_VERSION_MAJOR == 7
# define QT7_ONLY(...) __VA_ARGS__
# define QT6_ONLY(...)
#elif QT_VERSION_MAJOR == 6
# define QT7_ONLY(...)
# define QT6_ONLY(...) __VA_ARGS__
#else
# error Qt major version not 6 or 7
#endif
/* These two macros makes it possible to turn the builtin line expander into a
* string literal. */
#define QT_STRINGIFY2(x) #x