fix(cli): elf name requires output directory

crates/build/src/build.rs

@@ -44,15 +44,15 @@ pub fn execute_build_program(
         create_local_command(args, &program_dir, &program_metadata)
     };
 
-    execute_command(cmd, args.docker)?;
-
     let target_elf_paths = generate_elf_paths(&program_metadata, Some(args))?;
 
-    if let Some(output_directory) = &args.output_directory {
-        if target_elf_paths.len() > 1 && args.elf_name.is_some() {
-            anyhow::bail!("--elf-name is not supported when --output-directory is used and multiple ELFs are built.");
-        }
+    if target_elf_paths.len() > 1 && args.elf_name.is_some() {
+        anyhow::bail!("--elf-name is not supported when --output-directory is used and multiple ELFs are built.");
+    }
+
+    execute_command(cmd, args.docker)?;
 
+    if let Some(output_directory) = &args.output_directory {
         // The path to the output directory, maybe relative or absolute.
         let output_directory = PathBuf::from(output_directory);
 
@@ -72,8 +72,6 @@ pub fn execute_build_program(
 
             std::fs::copy(&elf_path, &output_path)?;
         }
-    } else if args.elf_name.is_some() {
-        println!("cargo:warning=ELF name is set but --output-directory is not used, the ELF will be place in the `target/` directory");
     }
 
     print_elf_paths_cargo_directives(&target_elf_paths);

crates/build/src/lib.rs

@@ -70,7 +70,7 @@ pub struct BuildArgs {
         num_args = 1..
     )]
     pub binaries: Vec<String>,
-    #[clap(long, action, help = "ELF binary name")]
+    #[clap(long, action, requires = "output_directory", help = "ELF binary name")]
     pub elf_name: Option<String>,
     #[clap(alias = "out-dir", long, action, help = "Copy the compiled ELF to this directory")]
     pub output_directory: Option<String>,