cross stdenv adaptor: Support --host --build --target across the board

Packages get --host and --target by default, but can explicitly request
any subset to be passed as needed. See docs for more info.

rustc: Avoid hash breakage by using the old (ignored)
dontSetConfigureCross when not cross building

1 files changed, 4 insertions, 2 deletions

diff --git a/pkgs/applications/video/mplayer/default.nix b/pkgs/applications/video/mplayer/default.nix
index 37b424d922ba5..9ae1b99f86fd4 100644
--- a/pkgs/applications/video/mplayer/default.nix
+++ b/pkgs/applications/video/mplayer/default.nix
@@ -25,6 +25,7 @@
 , libjpegSupport ? true, libjpeg ? null
 , useUnfreeCodecs ? false
 , darwin ? null
+, hostPlatform
 }:
 
 assert fontconfigSupport -> (fontconfig != null);
@@ -185,13 +186,14 @@ stdenv.mkDerivation rec {
     '';
 
   crossAttrs = {
-    dontSetConfigureCross = true;
+    configurePlatforms = [];
     # Some things (vidix) are nanonote specific. Once someone cares, we can make options from them.
+    # Note, the `target` vs `host` confusion is intensional.
     preConfigure = ''
       configureFlags="`echo $configureFlags |
         sed -e 's/--codecsdir[^ ]\+//' \
         -e 's/--enable-runtime-cpudetection//' `"
-      configureFlags="$configureFlags --target=${stdenv.cross.arch}-linux
+      configureFlags="$configureFlags --target=${hostPlatform.arch}-linux
         --enable-cross-compile --cc=$crossConfig-gcc --as=$crossConfig-as
         --disable-vidix-pcidb --with-vidix-drivers=no --host-cc=gcc"
     '';