fix: Build for darwin-arm64 (Apple M1)

- `liblzma-config.sh`: If configure fails, run autogen.sh / autoconf (*)
- refactor `build` action in `bindings.gyp` so that config and build scripts output is shown, making troubleshooting easier
  - `build` action refactored into `build` and `configure` actions with dependencies between them
  - since `configure` is a separate action instead of a command that runs as part of the 'input' key, it is free to output anything
  - script output is made less verbose and more clear, so it's not necessary to send to log file
  - this essentially means that configure & build could be the same script (configure is not run as part of configure stage of gyp)
- for reference, add link to XZ library used to README.md

(*) The drawback of this is that the fallback to autoconf requires a full autoconf type build environment, but it is a last resort fallback.

.gitignore

@@ -1,3 +1,4 @@
+*.log
 build/
 binding*/
 node_modules/
@@ -8,3 +9,4 @@ README.md.xz
 .nyc_output
 /.idea/
 prebuilds/
+/.vscode

README.md

@@ -9,7 +9,7 @@ lzma-native
 [![Dependency Status](https://david-dm.org/addaleax/lzma-native.svg?style=flat)](https://david-dm.org/addaleax/lzma-native)
 [![devDependency Status](https://david-dm.org/addaleax/lzma-native/dev-status.svg?style=flat)](https://david-dm.org/addaleax/lzma-native#info=devDependencies)
 
-Node.js interface to the native liblzma compression library (.xz file format, among others)
+Node.js interface for the native [XZ Utils liblzma native compression library](https://tukaani.org/xz/) (.xz file format, among others)
 
 This package provides interfaces for compression and decompression
 of `.xz` (and legacy `.lzma`) files, both stream-based and string-based.

binding.gyp

@@ -52,14 +52,17 @@
       "conditions" : [
         [ 'OS!="win"' , {
           "actions" : [
+            {
+              "action_name" : "configure",
+              'inputs':  ['liblzma-config.sh'],
+              'outputs': ['build/liblzma'],
+              'action':  ['eval', 'sh liblzma-config.sh build deps/xz-5.2.3.tar.bz2'],
+            },
             {
               "action_name" : "build",
-               # a hack to run deps/xz-5.2.3 ./configure during `node-gyp configure`
-              'inputs': ['<!@(sh liblzma-config.sh "<(module_root_dir)/build" "<(module_root_dir)/deps/xz-5.2.3.tar.bz2")'],
-              'outputs': [''],
-              'action': [
-                'sh', '<(module_root_dir)/liblzma-build.sh', '<(module_root_dir)/build'
-              ]
+              'inputs':  ['build/liblzma', 'liblzma-build.sh'],
+              'outputs': ['build/liblzma/Release'],
+              'action':  ['eval', 'sh liblzma-build.sh build'],
             }
           ]
         }, {

liblzma-build.sh

@@ -1,11 +1,18 @@
 #!/bin/sh
+
+echo
+echo "--- liblzma-build.sh $*"
+echo "--- CWD = $PWD"
+echo
+
 set -e
 
 case $(uname | tr '[:upper:]' '[:lower:]') in
   *bsd) alias make='gmake';;
   *)
 esac
 
-cd "$1/liblzma"
+set -x
+cd "$1" && cd liblzma
 make
 make install

liblzma-config.sh

@@ -1,22 +1,57 @@
 #!/bin/sh
-set -e
+
+echo
+echo "--- liblzma-config.sh $*"
+echo "--- CWD = $PWD"
+echo
 
 SRC_TARBALL="$2"
 TARGET_DIR="$1/liblzma"
-
 mkdir -p "$TARGET_DIR"
+
+tar xjf "$SRC_TARBALL" -C "$TARGET_DIR" || exit 1
+
 cd "$TARGET_DIR"
+TARGET_DIR="$(pwd)" # ensure absolute since --prefix needs it
+
+function autoconf() {
+    ( cd xz-* ; sh ./autogen.sh --no-po4a )
+    return $?
+}
 
-tar xvjf "$SRC_TARBALL" >node_liblzma_config.log 2>&1
+function configure() {
+    sh xz-*/configure \
+        --quiet --enable-silent-rules \
+        --prefix="$TARGET_DIR/build" \
+        CFLAGS="-fPIC $CFLAGS" \
+        --enable-static \
+        --disable-xz \
+        --disable-xzdec \
+        --disable-lzmadec \
+        --disable-lzmainfo \
+        --disable-lzma-links \
+        --disable-rpath \
+        --disable-shared \
+        --disable-scripts
+    return $?
+}
 
-export CFLAGS="-fPIC $CFLAGS"
+set -x
 
-# Fix build on Apple Silicon
+# FIXME: Remove after XZ 5.3 is released
 if [ $(uname) = "Darwin" -a $(uname -m) = "arm64" ]; then
-    XZ_SRC_DIR=$(ls | grep xz-*)
-    sed -i '' 's/\tnone)/\tarm64-*)\n\t\tbasic_machine=$(echo $basic_machine | sed "s\/arm64\/aarch64\/")\n\t\t;;\n\t\tnone)/g' $XZ_SRC_DIR/build-aux/config.sub
+    echo "--- Patching config.sub for Apple Silicon"
+    sed -i \
+        's/\tnone)/\tarm64-*)\n\t\tbasic_machine=$(echo $basic_machine | sed "s\/arm64\/aarch64\/")\n\t\t;;\n\t\tnone)/g' \
+        xz-*/build-aux/config.sub
+    echo
 fi
 
-sh xz-*/configure --enable-static --disable-shared --disable-scripts --disable-lzmainfo \
-    --disable-lzma-links --disable-lzmadec --disable-xzdec --disable-xz --disable-rpath \
-    --prefix="$TARGET_DIR/build" CFLAGS="$CFLAGS" >>node_liblzma_config.log 2>&1
+configure # || exit 1 # uncomment to disable use of autoconf
+if [ $? -ne 0 ] ; then
+  echo
+  echo "--- ./configure failed => trying to run autoconf first"
+  echo "--- NOTE: This requires a full autoconf build environment, and so may also fail"
+  echo
+  autoconf && configure
+fi