libcalamares: use Pybind11Helpers consistently

This header includes all of the needed pybind11 headers,
but also wrangles defines and warnings in one spot.

src/libcalamares/python/Api.cpp

@@ -14,6 +14,7 @@
 #include "compat/Variant.h"
 #include "locale/Global.h"
 #include "partition/Mount.h"
+#include "python/Pybind11Helpers.h"
 #include "python/PythonJob.h"
 #include "utils/Logger.h"
 #include "utils/RAII.h"
@@ -26,10 +27,6 @@
 #include <QDir>
 #include <QStandardPaths>
 
-#undef slots
-#include <pybind11/embed.h>
-#include <pybind11/pybind11.h>
-
 namespace py = pybind11;
 
 /** @namespace

src/libcalamares/python/Logger.h

@@ -18,8 +18,7 @@
 
 #include "utils/Logger.h"
 
-#undef slots
-#include <pybind11/pybind11.h>
+#include "python/Pybind11Helpers.h"
 
 #include <string>
 

src/libcalamares/python/Pybind11Helpers.h

@@ -14,9 +14,27 @@
 
 #include <string>
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wcovered-switch-default"
+#pragma clang diagnostic ignored "-Wfloat-equal"
+#pragma clang diagnostic ignored "-Wweak-vtables"
+#pragma clang diagnostic ignored "-Wmissing-variable-declarations"
+#pragma clang diagnostic ignored "-Wold-style-cast"
+#pragma clang diagnostic ignored "-Wshadow-uncaptured-local"
+#pragma clang diagnostic ignored "-Wshadow-field-in-constructor"
+#pragma clang diagnostic ignored "-Wshadow-field"
+#pragma clang diagnostic ignored "-Wdocumentation"
+#pragma clang diagnostic ignored "-Wmissing-noreturn"
+#pragma clang diagnostic ignored "-Wreserved-identifier"
+#endif
+
 #undef slots
 #include <pybind11/pybind11.h>
 
+#include <pybind11/embed.h>
+#include <pybind11/eval.h>
+
 namespace Calamares
 {
 namespace Python __attribute__( ( visibility( "hidden" ) ) )
@@ -35,4 +53,9 @@ namespace Python __attribute__( ( visibility( "hidden" ) ) )
 
 }  // namespace Python
 }  // namespace Calamares
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
 #endif

src/libcalamares/python/PythonJob.cpp

@@ -13,16 +13,13 @@
 #include "JobQueue.h"
 #include "python/Api.h"
 #include "python/Logger.h"
+#include "python/Pybind11Helpers.h"
 #include "utils/Logger.h"
 
 #include <QDir>
 #include <QFileInfo>
 #include <QString>
 
-#undef slots
-#include <pybind11/embed.h>
-#include <pybind11/eval.h>
-
 namespace py = pybind11;
 
 namespace