test: add test of LLVM integration into lake

src/lake/tests/llvm-bitcode-gen/.gitignore

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+/build
+/lakefile.olean
+/lake-packages/*

src/lake/tests/llvm-bitcode-gen/LlvmBitcodeGen.lean

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+-- This module serves as the root of the `LlvmBitcodeGen` library.
+-- Import modules here that should be built as part of the library.
+import «LlvmBitcodeGen».Basic

src/lake/tests/llvm-bitcode-gen/LlvmBitcodeGen/Basic.lean

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+def hello := "world"

src/lake/tests/llvm-bitcode-gen/Main.lean

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+import «LlvmBitcodeGen»
+import Lean
+open Lean
+
+
+def main : IO Unit :=
+  IO.println s!"LLVM backend enabled: '{Lean.Internal.hasLLVMBackend ()}'"

src/lake/tests/llvm-bitcode-gen/clean.sh

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+rm -rf build
+rm -rf lakefile.olean
+rm -rf lake-manifest.json

src/lake/tests/llvm-bitcode-gen/lake-manifest.json

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+{"version": 6,
+ "packagesDir": "lake-packages",
+ "packages": [],
+ "name": "«llvm-bitcode-gen»"}

src/lake/tests/llvm-bitcode-gen/lakefile.lean

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+import Lake
+import Lean
+open Lean
+open Lake DSL
+
+package «llvm-bitcode-gen» where
+  -- add package configuration options here
+  backend := .llvm
+
+lean_lib «LlvmBitcodeGen» where
+  -- add library configuration options here
+
+@[default_target]
+lean_exe «llvm-bitcode-gen» where
+  root := `Main
+  -- Enables the use of the Lean interpreter by the executable (e.g.,
+  -- `runFrontend`) at the expense of increased binary size on Linux.
+  -- Remove this line if you do not need such functionality.
+  supportInterpreter := true
+
+script hasLLVMBackend do
+  IO.println s!"Lake Lean.Internal.hasLLVMBackend: {Lean.Internal.hasLLVMBackend ()}"
+  return 0
+

src/lake/tests/llvm-bitcode-gen/test.sh

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+#!/usr/bin/env bash
+set -euxo pipefail
+
+LAKE=${LAKE:-../../build/bin/lake}
+
+./clean.sh
+
+# Skip test if we don't have LLVM backend in the Lean toolchain
+if [[ ! $(lean --features) =~ LLVM ]]; then
+  echo "Skipping test: 'lean' does not have LLVM backend enabled"
+  exit 0
+fi
+
+$LAKE update
+$LAKE build -v | grep "Main.bc.o" # check that we build using the bitcode object file.
+
+# If we have the LLVM backend, check that the `lakefile.lean` is aware of this.
+lake script run llvm-bitcode-gen/hasLLVMBackend | grep "true"
+
+# If we have the LLVM backend in the Lean toolchain, then we expect this to
+# print `true`, as this queries the same flag that Lake queries to check the presence
+# of the LLVM toolchian.
+./build/bin/llvm-bitcode-gen | grep 'true'
+
+# If we have the LLVM backend, check that lake builds bitcode artefacts.
+test -f build/ir/LlvmBitcodeGen.bc
+test -f build/ir/Main.bc