tdlib: fix cross-compilation

Author: eilvelia

pkgs/by-name/td/tdlib/package.nix

@@ -10,6 +10,7 @@
   writeShellApplication,
   common-updater-scripts,
   jq,
+  buildPackages,
 }:
 
 let
@@ -49,12 +50,28 @@ stdenv.mkDerivation {
   };
 
   buildInputs = [
-    gperf
     openssl
     readline
     zlib
   ];
-  nativeBuildInputs = [ cmake ];
+
+  nativeBuildInputs = [
+    cmake
+    gperf
+  ];
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
+  preConfigure = lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cmake -B native-build \
+      -DCMAKE_C_COMPILER=$CC_FOR_BUILD \
+      -DCMAKE_CXX_COMPILER=$CXX_FOR_BUILD \
+      -DCMAKE_AR=$(command -v $AR_FOR_BUILD) \
+      -DCMAKE_RANLIB=$(command -v $RANLIB_FOR_BUILD) \
+      -DCMAKE_STRIP=$(command -v $STRIP_FOR_BUILD) \
+      -DTD_GENERATE_SOURCE_FILES=ON .
+    cmake --build native-build -j $NIX_BUILD_CORES
+  '';
 
   # https://github.com/tdlib/td/issues/1974
   postPatch =