From a2440fb078b98dbc2a40260675284cf476def57a Mon Sep 17 00:00:00 2001
From: Adam Joseph <adam@westernsemico.com>
Date: Fri, 3 Nov 2023 22:25:17 -0700
Subject: [PATCH] pyqt5: fix cross

---
 pkgs/development/python-modules/pyqt/5.x.nix | 55 ++++++++++++++++++--
 1 file changed, 52 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/python-modules/pyqt/5.x.nix b/pkgs/development/python-modules/pyqt/5.x.nix
index 12d2ea182af0..c514b9f83584 100644
--- a/pkgs/development/python-modules/pyqt/5.x.nix
+++ b/pkgs/development/python-modules/pyqt/5.x.nix
@@ -12,6 +12,7 @@
 , pyqt5_sip
 , pyqt-builder
 , libsForQt5
+, enableVerbose ? true
 , withConnectivity ? false
 , withMultimedia ? false
 , withWebKit ? false
@@ -19,6 +20,9 @@
 , withLocation ? false
 , withSerialPort ? false
 , withTools ? false
+, pkgsBuildTarget
+, buildPackages
+, dbusSupport ? !stdenv.isDarwin
 }:
 
 buildPythonPackage rec {
@@ -45,6 +49,7 @@ buildPythonPackage rec {
   # be more verbose
   ''
     cat >> pyproject.toml <<EOF
+  '' + lib.optionalString enableVerbose ''
     [tool.sip.project]
     verbose = true
   ''
@@ -55,6 +60,37 @@ buildPythonPackage rec {
     minimum-macos-version = "11.0"
   '' + ''
     EOF
+  ''
+
+  # pyqt-builder tries to compile *and run* these programs.  This
+  # is really sad because the only thing they do is print out a
+  # flag based on whether or not some compile-time symbol was
+  # defined.  This could all be done without having to *execute*
+  # cross-compiled programs!
+  #
+  # Here is the complete list of things checked:
+  #
+  # QT_NO_PRINTDIALOG                                                           => PyQt_PrintDialog
+  # QT_NO_PRINTER                                                               => PyQt_Printer
+  # QT_NO_PRINTPREVIEWDIALOG                                                    => PyQt_PrintPreviewDialog
+  # QT_NO_PRINTPREVIEWWIDGET                                                    => PyQt_PrintPreviewWidget
+  # QT_NO_SSL                                                                   => PyQt_SSL
+  # QT_SHARED || QT_DLL                                                         => shared (otherwise static)
+  # QT_NO_PROCESS                                                               => PyQt_Process
+  # QT_NO_FPU || Q_PROCESSOR_ARM || Q_OS_WINCE                                  => PyQt_qreal_double
+  # sizeof (qreal) != sizeof (double)                                           => PyQt_qreal_double
+  # !Q_COMPILER_CONSTEXPR !Q_COMPILER_UNIFORM_INIT                              => PyQt_CONSTEXPR
+  # QT_NO_ACCESSIBILITY                                                         => PyQt_Accessibility
+  # QT_NO_OPENGL                                                                => PyQt_OpenGL PyQt_Desktop_OpenGL
+  # defined(QT_OPENGL_ES) || defined(QT_OPENGL_ES_2) || defined(QT_OPENGL_ES_3) => PyQt_Desktop_OpenGL
+  # QT_NO_RAWFONT                                                               => PyQt_RawFont
+  # QT_NO_SESSIONMANAGER                                                        => PyQt_SessionManager
+  #
+  + lib.optionalString (!(stdenv.buildPlatform.canExecute stdenv.hostPlatform)) ''
+    rm config-tests/cfgtest_QtCore.cpp
+    rm config-tests/cfgtest_QtGui.cpp
+    rm config-tests/cfgtest_QtNetwork.cpp
+    rm config-tests/cfgtest_QtPrintSupport.cpp
   '';
 
   enableParallelBuilding = true;
@@ -68,16 +104,27 @@ buildPythonPackage rec {
     export MAKEFLAGS+="''${enableParallelBuilding:+-j$NIX_BUILD_CORES}"
   '';
 
+  # tons of warnings from subpackages, no point in playing whack-a-mole
+  env = lib.optionalAttrs (!enableVerbose) {
+    NIX_CFLAGS_COMPILE = "-w";
+  };
+
   outputs = [ "out" "dev" ];
 
   dontWrapQtApps = true;
 
-  nativeBuildInputs = with libsForQt5; [
+  nativeBuildInputs = [
     pkg-config
-    qmake
+  ] ++ lib.optionals (stdenv.buildPlatform == stdenv.hostPlatform) [
+    libsForQt5.qmake
+  ] ++ [
     setuptools
     lndir
     sip
+  ] ++ (with pkgsBuildTarget.targetPackages.libsForQt5; [
+  ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
+    qmake
+  ] ++ [
     qtbase
     qtsvg
     qtdeclarative
@@ -90,11 +137,13 @@ buildPythonPackage rec {
     ++ lib.optional withLocation qtlocation
     ++ lib.optional withSerialPort qtserialport
     ++ lib.optional withTools qttools
-  ;
+  );
 
   buildInputs = with libsForQt5; [
     dbus
+  ] ++ lib.optionals (stdenv.buildPlatform == stdenv.hostPlatform) [
     qtbase
+  ] ++ [
     qtsvg
     qtdeclarative
     pyqt-builder