Hermes: Always use Unix Makefiles for Apple build, and use all available cores

Summary:
Hermes' build scripts use the Ninja build utility if available, otherwise they default to Unix Makefiles. When Unix Makefiles were used, builds would take far too long due to the use of a single core.

To reduce the surface area of issues that may arise as we switch to building Hermes from source, we will now focus on a single build system using Unix Makefiles. We will also ensure all available cores are used when building on macOS.

Changelog: [Internal]

Reviewed By: cortinico, neildhar

Differential Revision: D36296838

fbshipit-source-id: 4be23739fb022e3ae8e974ad3c2c70e7011abb5a

.circleci/config.yml

@@ -417,7 +417,7 @@ jobs:
       - with_brew_cache_span:
           steps:
             - brew_install:
-                package: cmake ninja
+                package: cmake
 
       - run:
           name: Setup the CocoaPods environment
@@ -474,7 +474,7 @@ jobs:
       - with_brew_cache_span:
           steps:
             - brew_install:
-                package: watchman cmake ninja
+                package: watchman cmake
             - run:
                 name: "Brew: Tap wix/brew"
                 command: brew tap wix/brew >/dev/null
@@ -745,7 +745,7 @@ jobs:
       - with_brew_cache_span:
           steps:
             - brew_install:
-                package: cmake ninja
+                package: cmake
 
       - run:
           name: Install CocoaPods dependencies
@@ -999,7 +999,7 @@ jobs:
       - run:
           name: Install dependencies
           command: |
-            brew install cmake ninja
+            brew install cmake
       - run:
           name: Build HermesC for macOS
           command: |

sdks/hermes-engine/utils/build-apple-framework.sh

@@ -10,20 +10,7 @@ else
   BUILD_TYPE="Release"
 fi
 
-function command_exists {
-  command -v "${1}" > /dev/null 2>&1
-}
-
-if command_exists "cmake"; then
-  if command_exists "ninja"; then
-    BUILD_SYSTEM="Ninja"
-  else
-    BUILD_SYSTEM="Unix Makefiles"
-  fi
-else
-  echo >&2 'CMake is required to install Hermes, install it with: brew install cmake'
-  exit 1
-fi
+NUM_CORES=$(sysctl -n hw.ncpu)
 
 function get_release_version {
   ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').version"
@@ -40,7 +27,7 @@ function get_mac_deployment_target {
 # Build host hermes compiler for internal bytecode
 function build_host_hermesc {
   cmake -S . -B build_host_hermesc
-  cmake --build ./build_host_hermesc --target hermesc
+  cmake --build ./build_host_hermesc --target hermesc -j ${NUM_CORES}
 }
 
 # Utility function to configure an Apple framework
@@ -58,7 +45,7 @@ function configure_apple_framework {
     build_cli_tools="false"
   fi
 
-  cmake -S . -B "build_$1" -G "$BUILD_SYSTEM" \
+  cmake -S . -B "build_$1" \
     -DHERMES_APPLE_TARGET_PLATFORM:STRING="$1" \
     -DCMAKE_OSX_ARCHITECTURES:STRING="$2" \
     -DCMAKE_OSX_DEPLOYMENT_TARGET:STRING="$3" \
@@ -84,12 +71,7 @@ function build_apple_framework {
   echo "Host hermesc is required to build apple frameworks!"
 
   configure_apple_framework "$1" "$2" "$3"
-
-  if [[ "$BUILD_SYSTEM" == "Ninja" ]]; then
-    (cd "./build_$1" && ninja install/strip)
-  else
-    (cd "./build_$1" && make install/strip)
-  fi
+  cmake --build "./build_$1" --target install/strip -j ${NUM_CORES}
 }
 
 # Accepts an array of frameworks and will place all of