qdoc: Add config variable for clang defines

The qdoc 'defines' config variable lists values
that contain '*' to represent wildcards, but clang
doesn't accept them. This change adds a new config
variable called 'clangdefines' which explicitly
lists all the defines that match the wildcards.

It also lists several Qt defines for C++11 stuff,
because when clangqdoc comes into use, all the
supported compilers for Qt will support C++11
constructs.

There might be a few defines listed in clangdefines
that are unnecessary and maybe a few that we really
should not include, but we can adjust the list as
needed.

The clangqdoc code that reads this new config variable
will be added in a separate change. This change will
not affect the non-clang qdoc, because qdoc will just
ignore the clangdefines variable.

This change also adds Q_CLANG_QDOC to 'defines' and
to 'clangdefine'. Q_CLANG_QDOC is meant to be used
in the sources the way Q_QDOC is used. It indicates
that a particular use of Q_QDOC has been reviewed and
is still required for clangqdoc.

Change-Id: I3b00b18ec726196eda5cfa8411cd3e87433fec59
Reviewed-by: Martin Smith <martin.smith@qt.io>

doc/global/qt-cpp-defines.qdocconf

@@ -1,6 +1,7 @@
 versionsym              = QT_VERSION_STR
 
 defines                 += Q_QDOC \
+                          Q_CLANG_QDOC \
                           QT_.*_SUPPORT \
                           QT_.*_LIB \
                           QT_COMPAT \
@@ -18,6 +19,53 @@ defines                 += Q_QDOC \
                           Q_COMPILER_UNIFORM_INIT \
                           Q_COMPILER_RVALUE_REFS
 
+clangdefines            += __cplusplus \
+                           Q_QDOC \
+                           Q_CLANG_QDOC \
+                           QT_COMPAT \
+                           QT3_SUPPORT \
+                           QT_BUILD_CORE_LIB \
+                           QT_BUILD_EGL_DEVICE_LIB \
+                           QT_BUILD_LOCATION_LIB \
+                           QT_BUILD_SCRIPT_LIB \
+                           QT_BUILD_TESTLIB_LIB \
+                           QT_BUILD_WIDGETS_LIB \
+                           QT_CORE_LIB \
+                           QT_DEPRECATED \
+                           QT_GUI_LIB \
+                           QT_KEYPAD_NAVIGATION \
+                           QT_LARGEFILE_SUPPORT \
+                           QT_NETWORK_LIB \
+                           QT_NO_EGL \
+                           QT_OPENGL_SUPPORT \
+                           QT_SCRIPT_LIB \
+                           QT_SHARED_POINTER_BACKTRACE_SUPPORT \
+                           QT_WIDGETS_LIB \
+                           Q_BYTE_ORDER \
+                           Q_CC_CLANG \
+                           Q_COMPILER_CONSTEXPR \
+                           Q_COMPILER_DEFAULT_MEMBERS \
+                           Q_COMPILER_DELETE_MEMBERS \
+                           Q_COMPILER_EXPLICIT_OVERRIDES \
+                           Q_COMPILER_INITIALIZER_LISTS \
+                           Q_COMPILER_MANGLES_RETURN_TYPE \
+                           Q_COMPILER_NOEXCEPT \
+                           Q_COMPILER_NULLPTR \
+                           Q_COMPILER_RVALUE_REFS \
+                           Q_COMPILER_STATIC_ASSERT \
+                           Q_COMPILER_UNIFORM_INIT \
+                           Q_COMPILER_UNICODE_STRINGS \
+                           Q_COMPILER_VARIADIC_MACROS \
+                           Q_COMPILER_VARIADIC_TEMPLATES \
+                           Q_ATOMIC_INT16_IS_SUPPORTED \
+                           Q_ATOMIC_INT64_IS_SUPPORTED \
+                           Q_ATOMIC_INT8_IS_SUPPORTED \
+                           Q_DEAD_CODE_FROM_QT4_MAC \
+                           Q_DEAD_CODE_FROM_QT4_WIN \
+                           Q_DEAD_CODE_FROM_QT4_X11
+
+# Q_COMPILER_REF_QUALIFIERS is not yet supported by all compilers
+
 Cpp.ignoretokens        += \
                           ENGINIOCLIENT_EXPORT \
                           PHONON_EXPORT \