Merge pull request #37885 from dtzWill/fix/musl-fts

musl-fts: setup-hook to add -lfts, use in xar and libselinux

pkgs/os-specific/linux/libselinux/default.nix

@@ -1,5 +1,6 @@
 { stdenv, fetchurl, fetchpatch, pkgconfig, libsepol, pcre
 , enablePython ? true, swig ? null, python ? null
+, musl-fts
 }:
 
 assert enablePython -> swig != null && python != null;
@@ -18,7 +19,8 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ libsepol pcre ]
-             ++ optionals enablePython [ swig python ];
+             ++ optionals enablePython [ swig python ]
+             ++ optional stdenv.hostPlatform.isMusl musl-fts;
 
   # Avoid this false warning:
   # avc_internal.c: In function 'avc_netlink_receive':

pkgs/os-specific/linux/musl/fts-setup-hook.sh

@@ -0,0 +1,17 @@
+ftsLdflags() {
+    # The `depHostOffset` describes how the host platform of the dependencies
+    # are slid relative to the depending package. It is brought into scope of
+    # the environment hook defined as the role of the dependency being applied.
+    case $depHostOffset in
+        -1) local role='BUILD_' ;;
+        0)  local role='' ;;
+        1)  local role='TARGET_' ;;
+        *)  echo "cc-wrapper: Error: Cannot be used with $depHostOffset-offset deps" >2;
+            return 1 ;;
+    esac
+
+    export NIX_${role}LDFLAGS+=" -lfts"
+}
+
+addEnvHooks "$hostOffset" ftsLdflags
+

pkgs/os-specific/linux/musl/fts.nix

@@ -11,4 +11,6 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
+
+  setupHook = ./fts-setup-hook.sh;
 }

pkgs/tools/compression/xar/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, libxml2, openssl, zlib, bzip2 }:
+{ stdenv, fetchurl, libxml2, openssl, zlib, bzip2, musl-fts }:
 
 stdenv.mkDerivation rec {
   version = "1.6.1";
@@ -9,7 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "0ghmsbs6xwg1092v7pjcibmk5wkyifwxw6ygp08gfz25d2chhipf";
   };
 
-  buildInputs = [ libxml2 openssl zlib bzip2 ];
+  buildInputs = [ libxml2 openssl zlib bzip2 ]
+    ++ stdenv.lib.optional stdenv.hostPlatform.isMusl musl-fts;
 
   meta = {
     homepage    = https://mackyle.github.io/xar/;