freshBootstrapTools.bootstrapTools: update for new SDK pattern

- Drop libSystem. It’s no longer needed. The SDK can be downloaded and
built with existing tools.
- Add jq and tapi. Adding these allows the stdenv bootstrap to stop
special-casing stage 0.
- Update tests for updated ld64. It handles code-signing properly, so
the signatures aren’t broken.

pkgs/stdenv/darwin/stdenv-bootstrap-tools.nix

···
   gnused,
   gnutar,
   gzip,
+  jq,
   ld64,
   libffi,
   libiconv,
+  libtapi,
   libxml2,
-  libyaml,
   llvmPackages,
   ncurses,
   nukeReferences,
+  oniguruma,
   openssl,
   patch,
   pbzx,
   runCommand,
   writeText,
-  xar,
+  xarMinimal,
   xz,
   zlib,
 }:
···
 
     in
     ''
-      mkdir -p $out/bin $out/lib $out/lib/darwin
-
-      ${lib.optionalString stdenv.targetPlatform.isx86_64 ''
-        # Copy libSystem's .o files for various low-level boot stuff.
-        cp -d ${getLib darwin.Libsystem}/lib/*.o $out/lib
+      mkdir -p $out/bin $out/include $out/lib $out/lib/darwin
 
-        # Resolv is actually a link to another package, so let's copy it properly
-        cp -L ${getLib darwin.Libsystem}/lib/libresolv.9.dylib $out/lib
-      ''}
-
-      cp -rL ${getDev darwin.Libsystem}/include $out
       chmod -R u+w $out/include
       cp -rL ${getDev libiconv}/include/* $out/include
       cp -rL ${getDev gnugrep.pcre2}/include/* $out/include
-      mv $out/include $out/include-Libsystem
 
       # Copy binutils.
       for i in as ld ar ranlib nm strip otool install_name_tool lipo codesign_allocate; do
···
       cp ${getBin xz}/bin/xz $out/bin
       cp -d ${getLib bzip2}/lib/libbz2*.dylib $out/lib
       cp -d ${getLib gmpxx}/lib/libgmp*.dylib $out/lib
-      cp -d ${getLib xar}/lib/libxar*.dylib $out/lib
+      cp -d ${getLib xarMinimal}/lib/libxar*.dylib $out/lib
       cp -d ${getLib xz}/lib/liblzma*.dylib $out/lib
       cp -d ${getLib zlib}/lib/libz*.dylib $out/lib
 
···
       cp -d ${getLib llvmPackages.llvm}/lib/libLLVM.dylib $out/lib
       cp -d ${getLib libffi}/lib/libffi*.dylib $out/lib
 
-      mkdir $out/include
       cp -rd ${getDev llvmPackages.libcxx}/include/c++ $out/include
 
-      # copy .tbd assembly utils
-      cp ${getBin darwin.rewrite-tbd}/bin/rewrite-tbd $out/bin
-      cp -d ${getLib libyaml}/lib/libyaml*.dylib $out/lib
+      # Copy tools needed to build the SDK
+      cp -d ${getBin jq}/bin/* $out/bin
+      cp -d ${getBin libtapi}/bin/* $out/bin
+
+      cp -d ${getLib jq}/lib/lib*.dylib $out/lib
+      cp -d ${getLib oniguruma}/lib/lib*.dylib $out/lib
+      cp -d ${getLib libtapi}/lib/libtapi*.dylib $out/lib
 
       # copy sigtool
       cp -d ${getBin darwin.sigtool}/bin/{codesign,sigtool} $out/bin
-
-      cp -d ${getLib darwin.libtapi}/lib/libtapi*.dylib $out/lib
 
       # tools needed to unpack bootstrap archive
       mkdir -p unpack/bin unpack/lib

pkgs/stdenv/darwin/test-bootstrap-tools.nix

···
 {
   lib,
   stdenv,
+  apple-sdk,
   bootstrapTools,
   hello,
 }:
···
     mkdir -p $out/bin
 
     for exe in $tools/bin/*; do
-      [[ $exe =~ bunzip2|codesign.*|false|install_name_tool|ld|lipo|pbzx|ranlib|rewrite-tbd|sigtool ]] && continue
+      [[ $exe =~ bunzip2|codesign.*|false|install_name_tool|ld|lipo|pbzx|ranlib|sigtool ]] && continue
       $exe --version > /dev/null || { echo $exe failed >&2; exit 1; }
     done
 
···
     lipo -info true
     pbzx -v
     # ranlib gets tested bulding hello
-    rewrite-tbd </dev/null
     sigtool -h
     rm true
 
···
     # an SSL-capable curl
     curl --version | grep SSL
 
-    # This approximates a bootstrap version of libSystem can that be
-    # assembled via fetchurl. Adapted from main libSystem expression.
-    mkdir libSystem-boot
-    cp -vr \
-      ${stdenv.cc.libc_dev}/lib/libSystem.B.tbd \
-      ${stdenv.cc.libc_dev}/lib/system \
-      libSystem-boot
+    # The stdenv bootstrap builds the SDK in the bootstrap. Use an existing SDK to test the tools.
+    export SDKROOT='${apple-sdk.sdkroot}'
 
-    sed -i "s|/usr/lib/system/|$PWD/libSystem-boot/system/|g" libSystem-boot/libSystem.B.tbd
-    ln -s libSystem.B.tbd libSystem-boot/libSystem.tbd
-    # End of bootstrap libSystem
-
-    export flags="-idirafter $tools/include-Libsystem --sysroot=$tools -L$tools/lib -L$PWD/libSystem-boot"
+    export flags="-idirafter $SDKROOT/usr/include --sysroot=$SDKROOT -L$SDKROOT/usr/lib -L$tools/lib -DTARGET_OS_IPHONE=0"
 
     export CPP="clang -E $flags"
     export CC="clang $flags"
     export CXX="clang++ $flags --stdlib=libc++ -isystem$tools/include/c++/v1"
 
-    # NOTE: These tests do a separate 'install' step (using cp), because
-    # having clang write directly to the final location apparently will make
-    # running the executable fail signature verification. (SIGKILL'd)
-    #
-    # Suspect this is creating a corrupt entry in the kernel cache, but it is
-    # unique to cctools ld. (The problem goes away with `-fuse-ld=lld`.)
-
     echo '#include <stdio.h>' >> hello1.c
     echo '#include <float.h>' >> hello1.c
     echo '#include <limits.h>' >> hello1.c
     echo 'int main() { printf("Hello World\n"); return 0; }' >> hello1.c
-    $CC -o hello1 hello1.c
-    cp hello1 $out/bin/
+    $CC -o $out/bin/hello1 hello1.c
     $out/bin/hello1
 
     echo '#include <iostream>' >> hello3.cc
     echo 'int main() { std::cout << "Hello World\n"; }' >> hello3.cc
-    $CXX -v -o hello3 hello3.cc
-    cp hello3 $out/bin/
+    $CXX -v -o $out/bin/hello3 hello3.cc
     $out/bin/hello3
 
     # test that libc++.dylib rpaths are correct so it can reference libc++abi.dylib when linked.
     # using -Wl,-flat_namespace is required to generate an error
     mkdir libtest/
     ln -s $tools/lib/libc++.dylib libtest/
-    clang++ -Wl,-flat_namespace -idirafter $tools/include-Libsystem -isystem$tools/include/c++/v1 \
-      --sysroot=$tools -L./libtest -L$PWD/libSystem-boot hello3.cc
+    clang++ -Wl,-flat_namespace -idirafter $SDKROOT/usr/include -isystem$tools/include/c++/v1 \
+      --sysroot=$SDKROOT -L$SDKROOT/usr/lib  -L./libtest -L$PWD/libSystem-boot hello3.cc
 
     tar xvf ${hello.src}
     cd hello-*