Update README.md

Author: Jason Mobarak

README.md

@@ -1,56 +1,18 @@
-# Overview of llvm-obfuscator-arm
+# Overview of Swift Toolchains
 
 [![Build Status](https://travis-ci.org/swift-nav/llvm-obfuscator-arm.svg?branch=master)](https://travis-ci.org/swift-nav/llvm-obfuscator-arm)
 
-Obfuscating compiler for ARM using https://github.com/obfuscator-llvm/obfuscator.
+This collection of toolchains includes several things:
 
-This is designed to be integrated with buildroot in order to provide an 
-obfuscating compiler for components that need it.
+- A build of LLVM 6 for ARM and x64 for use within Buildroot to run clang-tidy (and friends)
+- An abfuscating compiler for ARM using https://github.com/obfuscator-llvm/obfuscator
+- GCC arm-eabi-none toolchains for "bare metal" builds
 
-# Example usage
+# Example usage of LLVM packages in Buildroot
 
-To integrate with with buildroot, a package.mk will look like this (the `*_SOURCE`
-var below is important, you'll need to interact with the GitHub API to find it
-when upgrading to a new release):
-
-```make
-HOST_LLVM_OBFUSCATOR_VERSION = v7
-HOST_LLVM_OBFUSCATOR_SOURCE = $(HOST_LLVM_OBFUSCATOR_VERSION)/llvm-obfuscator-arm-x86.txz
-HOST_LLVM_OBFUSCATOR_SITE = https://github.com/swift-nav/llvm-obfuscator-arm/releases/download/
-HOST_LLVM_OBFUSCATOR_ACTUAL_SOURCE_TARBALL = llvm-obfuscator-$(HOST_LLVM_OBFUSCATOR_VERSION).tar.xz
-
-HOST_LLVM_OBFUSCATOR_DEPENDENCIES = host-xz
-
-define HOST_LLVM_OBFUSCATOR_PRE_EXTRACT_FIXUP
-	if ! [ -e $(DL_DIR)/$(HOST_LLVM_OBFUSCATOR_ACTUAL_SOURCE_TARBALL) ]; then \
-		mv -v $(DL_DIR)/$(shell basename $(HOST_LLVM_OBFUSCATOR_SOURCE)) $(DL_DIR)/$(HOST_LLVM_OBFUSCATOR_ACTUAL_SOURCE_TARBALL); fi
-	$(eval HOST_LLVM_OBFUSCATOR_SOURCE=$(HOST_LLVM_OBFUSCATOR_ACTUAL_SOURCE_TARBALL))
-endef
-
-HOST_LLVM_OBFUSCATOR_PRE_EXTRACT_HOOKS += HOST_LLVM_OBFUSCATOR_PRE_EXTRACT_FIXUP
-
-define HOST_LLVM_OBFUSCATOR_INSTALL_CMDS
-	mkdir -p $(HOST_DIR)/opt/llvm-obfuscator
-	rsync -az $(@D)/opt/llvm-obfuscator/ $(HOST_DIR)/opt/llvm-obfuscator/
-endef
-
-LLVM_OBF_CC = $(HOST_DIR)/opt/llvm-obfuscator/wrappers/bin/arm-linux-gnueabihf-clang
-LLVM_OBF_CXX = $(HOST_DIR)/opt/llvm-obfuscator/wrappers/bin/arm-linux-gnueabihf-clang++
-
-$(eval $(host-generic-package))
-```
-
-To upgrade to a new release of the compiler, use the GitHub API to find the
-new artifact ID (uses [jq](https://stedolan.github.io/jq/)):
-
-```bash
-> export GITHUB_TOKEN=... # your GitHub auth token
-> curl -sSL -H "Authorization: token $GITHUB_TOKEN" -H "Accept: application/vnd.github.v3.raw" https://api.github.com/repos/swift-nav/llvm-obfuscator-arm/releases/latest | jq '.assets[0].id,.assets[0].name,.tag_name'
-
-5086675
-"llvm-obfuscator-arm.txz"
-"v4"
-```
+To integrate with with Buildroot, see the examples in [piksi_buildroot](https://github.com/swift-nav/piksi_buildroot):
+- [llvm_obfuscator.mk](https://github.com/swift-nav/piksi_buildroot/blob/v2.2.0-release/package/llvm_obfuscator/llvm_obfuscator.mk)
+- [llvm_vanilla.mk](https://github.com/swift-nav/piksi_buildroot/blob/v2.2.0-release/package/llvm_vanilla/llvm_vanilla.mk)
 
 # Copyright