ffi: add script to build xcframework

We need to use a custom target spec for the iOS simulator. More details:

  rust-lang/rust#79408

Since that issue, all the targets except the x86_64 simulator have been
updated (one landed last night). There is a PR that updates the
simulator:

  rust-lang/rust#87699

Once that PR is merged we can remove the `x86_64-apple-ios7.0.json`
custom target spec and use the builtin.

ffi/.gitignore

@@ -0,0 +1,2 @@
+libs/
+out/

ffi/Cargo.toml

@@ -5,6 +5,10 @@ authors = ["David Cowden <david@withuno.com>"]
 license = "AGPL-3.0-only"
 edition = "2018"
 
+[lib]
+name = "uno"
+crate-type = ["staticlib"]
+
 [dependencies]
 uno = "0.1"
 

ffi/clean.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -x
+
+# libuno-*.a
+rm libs/*
+
+# Uno.xcframework
+rm out/* 
+
+rmdir libs out 

ffi/sumo.sh

@@ -0,0 +1,130 @@
+#!/bin/sh
+set -ex
+
+: "${LIBNAME:=libuno}"
+: "${OUTNAME:=Uno}"
+: "${TOOLCHAIN:=nightly}"
+: "${PROFILE:=release}"
+: "${PROFDIR:=$PROFILE}"
+
+#
+# Build an archs table because the triple arch is not the same as lipo arch.
+#
+ARCHS="
+aarch64
+x86_64
+"
+subarchs=$(mktemp -d)
+echo "arm64v8" > $subarchs/aarch64
+echo "x86_64" > $subarchs/x86_64
+
+mkdir -p libs
+
+#
+# Build macOS.
+#
+lipo_args=""
+
+for ARCH in $ARCHS
+do
+  TRIPLE="$ARCH-apple-darwin"
+  cargo +$TOOLCHAIN build \
+      -Z unstable-options --profile $PROFILE \
+      -Z build-std \
+      --target $TRIPLE
+
+  larch=$(< $subarchs/$ARCH)
+  lipo_args="$lipo_args
+    -arch $larch ../target/$TRIPLE/$PROFDIR/$LIBNAME.a"
+done
+
+lipo -create $lipo_args -output libs/$LIBNAME-macos.a
+
+xc_args="$xc_args
+    -library libs/$LIBNAME-macos.a"
+xc_args="$xc_args
+    -headers include"
+
+
+#
+# Build iOS.
+#
+cargo +$TOOLCHAIN build \
+    -Z unstable-options --profile $PROFILE \
+    -Z build-std \
+    --target aarch64-apple-ios
+
+cp ../target/aarch64-apple-ios/$PROFDIR/$LIBNAME.a libs/$LIBNAME-ios.a
+
+xc_args="$xc_args
+    -library libs/$LIBNAME-ios.a"
+xc_args="$xc_args
+    -headers include"
+
+
+#
+# Build ios simulator.
+#
+cargo +$TOOLCHAIN build \
+    -Z unstable-options --profile $PROFILE \
+    -Z build-std \
+    --target aarch64-apple-ios-sim
+
+lipo_args="
+    -arch arm64v8 ../target/aarch64-apple-ios-sim/$PROFDIR/$LIBNAME.a"
+
+#
+# The simulator rustc target on x86_64 does not have the correct load_command.
+# Use a custom target with the correct one specified. Can be removed when:
+#
+#   https://github.com/rust-lang/rust/pull/87699
+#
+# is merged.
+#
+cargo +$TOOLCHAIN build \
+    -Z unstable-options --profile $PROFILE \
+    -Z build-std \
+    --target x86_64-apple-ios7.0.json
+
+lipo_args="$lipo_args
+    -arch x86_64 ../target/x86_64-apple-ios7.0/$PROFDIR/$LIBNAME.a"
+
+lipo -create $lipo_args -output libs/$LIBNAME-ios-sim.a
+
+xc_args="$xc_args
+    -library libs/$LIBNAME-ios-sim.a"
+xc_args="$xc_args
+    -headers include"
+
+
+#
+# Build mac catalyst.
+#
+lipo_args=""
+for ARCH in $ARCHS
+do
+  TRIPLE="$ARCH-apple-ios-macabi"
+  cargo +$TOOLCHAIN build \
+      -Z unstable-options --profile $PROFILE \
+      -Z build-std \
+      --target $TRIPLE
+
+  larch=$(< $subarchs/$ARCH)
+  lipo_args="$lipo_args
+    -arch $larch ../target/$TRIPLE/$PROFDIR/$LIBNAME.a"
+done
+
+lipo -create $lipo_args -output libs/$LIBNAME-ios-macabi.a
+
+xc_args="$xc_args
+    -library libs/$LIBNAME-ios-macabi.a"
+xc_args="$xc_args
+    -headers include"
+
+
+#
+# Build the sumo xcframework.
+#
+mkdir -p out
+xcodebuild -create-xcframework $xc_args -output out/$OUTNAME.xcframework
+

ffi/x86_64-apple-ios7.0.json

@@ -0,0 +1,36 @@
+{
+  "abi-return-struct-as-int": true,
+  "arch": "x86_64",
+  "archive-format": "darwin",
+  "cpu": "core2",
+  "data-layout": "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128",
+  "dll-suffix": ".dylib",
+  "dwarf-version": 2,
+  "eh-frame-header": false,
+  "emit-debug-gdb-scripts": false,
+  "executables": true,
+  "frame-pointer": "always",
+  "function-sections": false,
+  "has-rpath": true,
+  "is-builtin": false,
+  "is-like-osx": true,
+  "link-env": [
+    "ZERO_AR_DATE=1"
+  ],
+  "link-env-remove": [
+    "MACOSX_DEPLOYMENT_TARGET"
+  ],
+  "linker-is-gnu": false,
+  "llvm-target": "x86_64-apple-ios7.0",
+  "max-atomic-width": 64,
+  "os": "ios",
+  "split-debuginfo": "packed",
+  "stack-probes": {
+    "kind": "call"
+  },
+  "target-family": [
+    "unix"
+  ],
+  "target-pointer-width": "64",
+  "vendor": "apple"
+}