Add all the manually-generated bits for the c-bindings crate

Including:
 * A script to automatically generate all the rest,
 * Cargo.toml and cbindgen.toml,
 * manually-written wrapper types for a few types

Author: TheBlueMatt

genbindings.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+set -e
+cd c-bindings-gen && cargo build && cd ..
+GEN="$(pwd)/c-bindings-gen/target/debug/c-bindings-gen"
+SRC="$(pwd)/lightning/src"
+OUT="$(pwd)/lightning-c-bindings/src"
+OUT_F="$(pwd)/lightning-c-bindings/include/rust_types.h"
+echo > $OUT_F
+
+rm lightning-c-bindings/src/{ln,util,chain}/*
+RUST_BACKTRACE=1 $GEN $SRC/ $OUT/ lightning "" $OUT_F
+
+cd lightning-c-bindings
+cargo build
+PATH="$PATH:~/.cargo/bin"
+cbindgen -v --config cbindgen.toml -o include/lightning.h
+gcc -static -pthread demo.c ../target/debug/liblightning.a -ldl
+echo "Bin size w/o optimization:"
+ls -lha a.out
+
+cargo rustc -v --release -- -C lto
+clang -flto -O2 -static -pthread demo.c ../target/release/liblightning.a -ldl
+echo "Bin size with only RL optimized:"
+ls -lha a.out
+
+cargo rustc -v --release -- -C linker-plugin-lto -C lto
+clang -flto -O2 -static -pthread demo.c ../target/release/liblightning.a -ldl
+echo "Bin size with cross-language LTO:"
+ls -lha a.out

lightning-c-bindings/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "lightning-c-bindings"
+version = "0.0.1"
+authors = ["Matt Corallo"]
+license = "Apache-2.0"
+edition = "2018"
+description = """
+Utilities to fetch the chain from Bitcoin Core REST/RPC Interfaces and feed them into Rust Lightning.
+"""
+
+[lib]
+name = "lightning"
+crate-type = ["staticlib"]
+
+[dependencies]
+bitcoin = "0.23"
+lightning = { version = "0.0.11", path = "../lightning" }