temporarily support armv4

debian/changelog

@@ -19,6 +19,9 @@ qt6-base (6.6.2+dfsg-9) UNRELEASED; urgency=medium
   * Backport upstream commit f319895389705a3db7c2134d1ed47ceade1b204e to fix
     the build on the Hurd; patch
     upstream_IPC-add-PATH_MAX-less-fallback-definition-for-MAX_PA.patch.
+  * Copy/import the patch armv4.diff from Qt5 to support ARMv4; it is needed
+    to be able to build Qt6 bits with clang 16 and older, which in Debian still
+    defaults to ARMv4.
 
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sat, 22 Jun 2024 17:18:30 +0200
 

debian/patches/armv4.diff

@@ -0,0 +1,26 @@
+Description: support ARMv4 architecture, needed for armel builds
+Author: Dmitry Shachnev <mitya57@debian.org>
+Forwarded: no
+Last-Update: 2016-07-01
+
+--- a/src/corelib/global/qprocessordetection.h
++++ b/src/corelib/global/qprocessordetection.h
+@@ -132,6 +132,8 @@
+ #  elif defined(__ARM_ARCH_5TEJ__) \
+         || defined(__ARM_ARCH_5TE__)
+ #    define Q_PROCESSOR_ARM 5
++#  elif defined(__ARM_ARCH_4T__)
++#    define Q_PROCESSOR_ARM 4
+ #  else
+ #    define Q_PROCESSOR_ARM 0
+ #  endif
+@@ -146,6 +148,9 @@
+ #  endif
+ #  if Q_PROCESSOR_ARM >= 5
+ #    define Q_PROCESSOR_ARM_V5
++#  endif
++#  if Q_PROCESSOR_ARM >= 4
++#    define Q_PROCESSOR_ARM_V4
+ #  else
+ #    error "ARM architecture too old"
+ #  endif

debian/patches/series

@@ -15,5 +15,8 @@ remove_rpath_from_examples.patch
 forkfd_grow_stack_upwards_on_hppa.patch
 enable_skip_plugins.patch
 
-# Don't use yield on CPUs that might not support it
+# Support old ARM architectures
+# - Don't use yield on CPUs that might not support it
 armel-noyield.patch
+# - Support ARMv4 until clang < 17 is available in Debian
+armv4.diff