Compile kdsingleapplicationguard as separate lib

thirdparty/kdsingleapplicationguard/kdtoolsglobal.cpp

@@ -0,0 +1,32 @@
+#include "kdtoolsglobal.h"
+
+#include <QByteArray>
+
+#include <algorithm>
+
+namespace {
+    struct Version {
+	unsigned char v[3];
+    };
+
+    static inline bool operator<( const Version & lhs, const Version & rhs ) {
+	return std::lexicographical_compare( lhs.v, lhs.v + 3, rhs.v, rhs.v + 3 );
+    }
+    static inline bool operator==( const Version & lhs, const Version & rhs ) {
+	return std::equal( lhs.v, lhs.v + 3, rhs.v );
+    }
+    KDTOOLS_MAKE_RELATION_OPERATORS( Version, static inline )
+}
+
+static Version kdParseQtVersion( const char * const version ) {
+    if ( !version || qstrlen( version ) < 5 || version[1] != '.' || version[3] != '.' || ( version[5] != 0 && version[5] != '.' && version[5] != '-' ) )
+	return Version(); // parse error
+    const Version result = { { version[0] - '0', version[2] - '0', version[4] - '0' } };
+    return result;
+}
+
+bool _kdCheckQtVersion_impl( int major, int minor, int patchlevel ) {
+    static const Version actual = kdParseQtVersion( qVersion() ); // do this only once each run...
+    const Version requested = { { major, minor, patchlevel } };
+    return actual >= requested;
+}