Rebuild ForsythTriOptimizer for macOS

- on macOS Catalina 10.15.7
- with Xcode 12.4
- as a Universal binary.

#rb self
#jira UE-145038
#preflight n/a
#rnx

[CL 19373146 by will damon in ue5-main branch]

Engine/Build/Commit.gitdeps.xml

@@ -89473,8 +89473,8 @@
     <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Linux/aarch64-unknown-linux-gnueabi/libForsythTriOptimizerd.a" Hash="a13bae58406198875eab796279c6a2c92a1ad4a1" />
     <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Linux/x86_64-unknown-linux-gnu/libForsythTriOptimizer.a" Hash="b6768889c54212051b1ce1b757f80daecb324404" />
     <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Linux/x86_64-unknown-linux-gnu/libForsythTriOptimizerd.a" Hash="a74820f224523f02b66e728812f93c3175f1c545" />
-    <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Mac/libForsythTriOptimizer.a" Hash="a00052fdb985f6e2cf545d0b2fec53db26886bdb" />
-    <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Mac/libForsythTriOptimizerd.a" Hash="4a5b3fa350a92b2e7d19b7015fdd7323e4c831ee" />
+    <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Mac/libForsythTriOptimizer.a" Hash="51ab078659077d24b102b09da0136a33d1e75b06" />
+    <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Mac/libForsythTriOptimizerd.a" Hash="f482177091dc93b9c609bebb4402b08567613608" />
     <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Win64/VS2015/ForsythTriOptimizerD_64.lib" Hash="87e9411db6e4e0afd8b3d8cb160b1d8ddbe31c8e" />
     <File Name="Engine/Source/ThirdParty/ForsythTriOO/Lib/Win64/VS2015/ForsythTriOptimizer_64.lib" Hash="89717cee96b378da39a9b46a387850313542cb6e" />
     <File Name="Engine/Source/ThirdParty/FreeImage/FreeImage-3.18.0/README.iphone" Hash="02da9bb9424be90dfeaacc88c1fb706438f1b0e4" />
@@ -122939,7 +122939,6 @@
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@@ -124711,6 +124710,7 @@
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@@ -171294,6 +171294,7 @@
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Engine/Source/ThirdParty/ForsythTriOO/BuildForMac.command

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+set -e
+
+UE_MODULE_LOCATION=`pwd`
+
+SOURCE_LOCATION="$UE_MODULE_LOCATION/"
+INSTALL_LOCATION="$UE_MODULE_LOCATION/Lib/Mac/"
+BUILD_LOCATION="$UE_MODULE_LOCATION/Intermediate"
+
+rm -rf $BUILD_LOCATION
+
+mkdir $BUILD_LOCATION
+pushd $BUILD_LOCATION
+
+CMAKE_ARGS=(
+    -DCMAKE_INSTALL_PREFIX="$INSTALL_LOCATION"
+    -DCMAKE_OSX_DEPLOYMENT_TARGET="10.9"
+    -DCMAKE_BUILD_TYPE=Release
+    -DBUILD_SHARED_LIBS=OFF
+)
+
+if [ "$BUILD_UNIVERSAL" = true ] ; then
+    CMAKE_ARGS+=(-DCMAKE_OSX_ARCHITECTURES="arm64;x86_64")
+fi
+
+echo Configuring build for ForsythTriOO...
+cmake -G "Xcode" $SOURCE_LOCATION "${CMAKE_ARGS[@]}"
+
+echo Building ForsythTriOO for Debug...
+cmake --build . --config Debug
+
+echo Installing ForsythTriOO for Debug...
+cmake --install . --config Debug
+
+echo Building ForsythTriOO for Release...
+cmake --build . --config Release
+
+echo Installing ForsythTriOO for Release...
+cmake --install . --config Release
+
+cp "$BUILD_LOCATION/Release/libForsythTriOptimizer.a" "$INSTALL_LOCATION/libForsythTriOptimizer.a"
+cp "$BUILD_LOCATION/Debug/libForsythTriOptimizer.a" "$INSTALL_LOCATION/libForsythTriOptimizerd.a"
+
+popd
+
+echo Done.