darwin.Libsystem: export _mach_init_routine

pkgs/os-specific/darwin/apple-source-releases/Libsystem/default.nix

@@ -56,9 +56,8 @@ appleDerivation rec {
     # The startup object files
     cp ${Csu}/lib/* $out/lib
 
-    # Narrowly speaking, these would work if we re-exported libsystem_c and libsystem_kernel,
-    # but we also need to run the original central libsystem constructor (which initializes
-    # a ton of crap for its consitutent libraries) so we link against the central library here.
+    # We can't re-exported libsystem_c and libsystem_kernel directly,
+    # so we link against the central library here.
     mkdir -p $out/lib/system
     ld -macosx_version_min 10.7 -arch x86_64 -dylib \
        -o $out/lib/system/libsystem_c.dylib \
@@ -70,8 +69,14 @@ appleDerivation rec {
        /usr/lib/libSystem.dylib \
        -reexported_symbols_list ${./system_kernel_symbols}
 
-    libs=$(otool -arch x86_64 -L /usr/lib/libSystem.dylib | tail -n +3 | awk '{ print $1 }')
+    # The umbrella libSystem also exports some symbols,
+    # but we don't want to pull in everything from the other libraries.
+    ld -macosx_version_min 10.7 -arch x86_64 -dylib \
+       -o $out/lib/libSystem_internal.dylib \
+       /usr/lib/libSystem.dylib \
+       -reexported_symbols_list ${./system_symbols}
 
+    libs=$(otool -arch x86_64 -L /usr/lib/libSystem.dylib | tail -n +3 | awk '{ print $1 }')
 
     for i in $libs; do
       if [ "$i" != "/usr/lib/system/libsystem_kernel.dylib" ] && [ "$i" != "/usr/lib/system/libsystem_c.dylib" ]; then
@@ -79,14 +84,13 @@ appleDerivation rec {
       fi
     done
 
-    ld -macosx_version_min 10.7 \
-       -arch x86_64 \
-       -dylib \
+    ld -macosx_version_min 10.7 -arch x86_64 -dylib \
        -o $out/lib/libSystem.B.dylib \
        -compatibility_version 1.0 \
        -current_version 1226.10.1 \
        -reexport_library $out/lib/system/libsystem_c.dylib \
        -reexport_library $out/lib/system/libsystem_kernel.dylib \
+       -reexport_library $out/lib/libSystem_internal.dylib \
        $args
 
     ln -s libSystem.B.dylib $out/lib/libSystem.dylib

pkgs/os-specific/darwin/apple-source-releases/Libsystem/system_symbols

@@ -0,0 +1 @@
+_mach_init_routine