fix building without llvm

cli/Cargo.toml

@@ -20,7 +20,8 @@ default = ["target-aarch64", "target-x86_64", "target-wasm32", "editor", "llvm"]
 wasm32-cli-run = ["target-wasm32", "run-wasm32"]
 i386-cli-run = ["target-x86"]
 
-llvm = ["roc_build/llvm"]
+# TODO: change to roc_repl_cli/llvm once roc_repl can run without llvm.
+llvm = ["roc_build/llvm", "roc_repl_cli"]
 
 editor = ["roc_editor"]
 
@@ -59,7 +60,7 @@ roc_reporting = { path = "../reporting" }
 roc_error_macros = { path = "../error_macros" }
 roc_editor = { path = "../editor", optional = true }
 roc_linker = { path = "../linker" }
-roc_repl_cli = { path = "../repl_cli" }
+roc_repl_cli = { path = "../repl_cli", optional = true }
 clap = { version = "= 3.0.0-beta.5", default-features = false, features = ["std", "color", "suggestions"] }
 const_format = "0.2.22"
 bumpalo = { version = "3.8.0", features = ["collections"] }

cli/src/main.rs

@@ -63,10 +63,16 @@ fn main() -> io::Result<()> {
             }
         }
         Some((CMD_REPL, _)) => {
-            roc_repl_cli::main()?;
+            #[cfg(feature = "llvm")]
+            {
+                roc_repl_cli::main()?;
 
-            // Exit 0 if the repl exited normally
-            Ok(0)
+                // Exit 0 if the repl exited normally
+                Ok(0)
+            }
+
+            #[cfg(not(feature = "llvm"))]
+            todo!("enable roc repl without llvm");
         }
         Some((CMD_EDIT, matches)) => {
             match matches

compiler/build/src/program.rs

@@ -179,7 +179,7 @@ pub fn gen_from_mono_module(
     _emit_debug_info: bool,
 ) -> CodeGenTiming {
     match opt_level {
-        OptLevel::Optimize => {
+        OptLevel::Optimize | OptLevel::Size => {
             todo!("Return this error message in a better way: optimized builds not supported without llvm backend");
         }
         OptLevel::Normal | OptLevel::Development => {

repl_cli/Cargo.toml

@@ -14,7 +14,7 @@ rustyline = {git = "https://github.com/rtfeldman/rustyline", tag = "v9.1.1"}
 rustyline-derive = {git = "https://github.com/rtfeldman/rustyline", tag = "v9.1.1"}
 target-lexicon = "0.12.2"
 
-roc_build = {path = "../compiler/build"}
+roc_build = {path = "../compiler/build", features = ["llvm"]}
 roc_collections = {path = "../compiler/collections"}
 roc_gen_llvm = {path = "../compiler/gen_llvm"}
 roc_load = {path = "../compiler/load"}