Added the ability to vendor shaderc

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "vendor/llvm"]
 	path = vendor/llvm
 	url = https://github.com/llvm/llvm-project
+[submodule "vendor/shaderc"]
+	path = vendor/shaderc
+	url = https://github.com/google/shaderc

CMakeLists.txt

@@ -6,7 +6,7 @@ set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 include(FindPkgConfig)
-find_package(Boost 1.78
+find_package(Boost 1.74
         COMPONENTS log)
 list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")
 if (EXISTS "${CMAKE_CURRENT_LIST_DIR}/vendor/llvm/llvm/CMakeLists.txt")
@@ -26,14 +26,19 @@ if (EXISTS "${CMAKE_CURRENT_LIST_DIR}/vendor/llvm/llvm/CMakeLists.txt")
 
 else()
 message(STATUS "Using system LLVM")
-find_package(LLVM 13 REQUIRED CONFIG)
+find_package(LLVM 14 REQUIRED CONFIG)
 endif()
 
 include(AddLLVM)
 include(HandleLLVMOptions)
 
+if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/vendor/shaderc/CMakeLists.txt")
+    set(SHADERC_SKIP_TESTS ON)
+    add_subdirectory(vendor/shaderc)
 
-#pkg_check_modules(shaderc REQUIRED IMPORTED_TARGET shaderc)
+else()
+    pkg_check_modules(shaderc REQUIRED IMPORTED_TARGET shaderc)
+endif()
 
 message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
 

README.md

@@ -1,7 +1,8 @@
 Installing on RPi (3 or 4):
 
-```
+```shell
 curl https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
 echo deb https://apt.llvm.org/bullseye llvm-toolchain-bullseye-14 main >/etc/apt/sources.list.d/llvm14.list
-apt install llvm-14-tools llvm-14-dev clang build-essential cmake
-```
+apt install llvm-14-tools clang build-essential cmake git \ 
+    llvm-14-dev libboost-log-dev spirv-headers spirv-tools
+```