cmake: add a toolchain file and convenience script for clang builds

.gitignore

@@ -9,7 +9,8 @@ demos
 .idea/
 CmakeSettings.json
 cmake-build-*/
-build
+build/
+build-clang/
 build-DobieStation-*
 debug
 release

cmake/Toolchain-clang-linux-native.cmake

@@ -0,0 +1,16 @@
+# The name of the target operating system
+set(CMAKE_SYSTEM_NAME Linux)
+
+# Try to find clang for C and C++
+find_program(CMAKE_C_COMPILER   clang)
+find_program(CMAKE_CXX_COMPILER clang++)
+
+# Toolchain find root modes
+#   NEVER - search host system only
+#   ONLY  - search CMAKE_FIND_ROOT_PATH only
+#   BOTH  - search both
+# Probably not needed for a native toolchain so commenting these out
+#set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+#set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+#set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+#set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

gen-clang.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+CMAKE="cmake"
+BUILD_DIR="build-clang"
+TOOLCHAIN="./cmake/Toolchain-clang-linux-native.cmake"
+
+exec $CMAKE . -B "$BUILD_DIR" -DCMAKE_TOOLCHAIN_FILE="$TOOLCHAIN" "$@"