[libcalamares] Prepare for ie (Interlingue) support in Qt

src/libcalamares/locale/Tests.cpp

@@ -122,9 +122,15 @@ LocaleTests::testEsperanto()
 void
 LocaleTests::testInterlingue()
 {
+#if CALAMARES_QT_SUPPORT_INTERLINGUE
+    // ie was fixed in version ... of Qt
+    QCOMPARE( QLocale( "ie" ).language(), QLocale::Interlingue );
+    QCOMPARE( QLocale( QLocale::Interlingue ).language(), QLocale::Interlingue );
+#else
     // ie / Interlingue is borked (is "ie" even the right name?)
     QCOMPARE( QLocale( "ie" ).language(), QLocale::C );
     QCOMPARE( QLocale( QLocale::Interlingue ).language(), QLocale::English );
+#endif
 
     // "ia" exists (post-war variant of Interlingue)
     QCOMPARE( QLocale( "ia" ).language(), QLocale::Interlingua );

src/libcalamares/locale/Translation.cpp

@@ -94,11 +94,11 @@ static constexpr const TranslationSpecialCase special_cases[] = {
       QLocale::Script::AnyScript,
       QLocale::Country::AnyCountry,
       nullptr },
-    // Interlingue is mapped to interlingu*a* because
+    // Interlingue is mapped to interlingu*a* (up until Qt version ...) because
     //   the real Language::Interlingue acts like C locale.
     { "ie",
       nullptr,
-      QLocale::Language::Interlingua,
+      CALAMARES_QT_SUPPORT_INTERLINGUE ? QLocale::Language::Interlingue : QLocale::Language::Interlingua,
       QLocale::Script::AnyScript,
       QLocale::Country::AnyCountry,
       "Interlingue" },

src/libcalamares/locale/Translation.h

@@ -18,6 +18,9 @@
 #include <QObject>
 #include <QString>
 
+///@brief Define to 1 if the Qt version being used supports Interlingue fully
+#define CALAMARES_QT_SUPPORT_INTERLINGUE 0
+
 namespace Calamares
 {
 namespace Locale
@@ -35,6 +38,8 @@ namespace Locale
  *   Serbian written with Latin characters (not Cyrillic).
  * - `ca@valencia` is the Catalan dialect spoken in Valencia.
  *   There is no Qt code for it.
+ *
+ * (There are more special cases, not documented here)
  */
 class DLLEXPORT Translation : public QObject
 {