From f198a8a111ef08079f76171c5b8efdda50518283 Mon Sep 17 00:00:00 2001
From: Doron Behar <doron.behar@gmail.com>
Date: Sat, 16 Aug 2025 22:00:26 +0300
Subject: [PATCH] gnuradio: fix cross compilation

---
 pkgs/applications/radio/gnuradio/default.nix | 4 +++-
 pkgs/applications/radio/gnuradio/shared.nix  | 8 +++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/pkgs/applications/radio/gnuradio/default.nix b/pkgs/applications/radio/gnuradio/default.nix
index f376fe9e5061..96962f914f7a 100644
--- a/pkgs/applications/radio/gnuradio/default.nix
+++ b/pkgs/applications/radio/gnuradio/default.nix
@@ -67,7 +67,7 @@ let
       # when gr-qtgui is disabled, icu needs to be included, otherwise
       # building with boost 1.7x fails
       ++ lib.optionals (!(hasFeature "gr-qtgui")) [ icu ];
-      pythonNative = with python.pkgs; [
+      pythonNative = with python.pythonOnBuildForHost.pkgs; [
         mako
         six
       ];
@@ -337,6 +337,8 @@ stdenv.mkDerivation (
         # This is the only python reference worth removing, if needed.
         + lib.optionalString (!hasFeature "python-support") ''
           remove-references-to -t ${python} $out/lib/cmake/gnuradio/GnuradioConfig.cmake
+        ''
+        + lib.optionalString (!hasFeature "python-support" && hasFeature "gnuradio-runtime") ''
           remove-references-to -t ${python} $(readlink -f $out/lib/libgnuradio-runtime${stdenv.hostPlatform.extensions.sharedLibrary})
           remove-references-to -t ${python.pkgs.pybind11} $out/lib/cmake/gnuradio/gnuradio-runtimeTargets.cmake
         '';
diff --git a/pkgs/applications/radio/gnuradio/shared.nix b/pkgs/applications/radio/gnuradio/shared.nix
index 74864a98cf1b..c604f0bb7360 100644
--- a/pkgs/applications/radio/gnuradio/shared.nix
+++ b/pkgs/applications/radio/gnuradio/shared.nix
@@ -24,6 +24,7 @@ let
     minor = builtins.elemAt (lib.splitVersion version) 2;
     patch = builtins.elemAt (lib.splitVersion version) 3;
   };
+  cross = stdenv.hostPlatform != stdenv.buildPlatform;
 in
 {
   src =
@@ -57,7 +58,12 @@ in
       ))
     ) featuresInfo
   );
-  cmakeFlags = lib.mapAttrsToList (
+  cmakeFlags = [
+    # https://pybind11.readthedocs.io/en/stable/changelog.html#version-2-13-0-june-25-2024
+    (lib.cmakeBool "CMAKE_CROSSCOMPILING" cross)
+    (lib.cmakeBool "PYBIND11_USE_CROSSCOMPILING" (cross && hasFeature "gnuradio-runtime"))
+  ]
+  ++ lib.mapAttrsToList (
     feat: info:
     (
       if feat == "basic" then