编译Resurrection Remix时brunch触发Makefile语法错误求助

Hey there, let's break down those frustrating Makefile errors you're hitting—they're all about strict syntax rules that Make enforces, so once we spot the mismatch, fixing it will be straightforward.

First, let's clarify what those errors actually mean:

• *** missing separator: Make requires every command line (recipe) under a target to start with a single, literal Tab character. Spaces, multiple Tabs, or mixed spaces/Tabs will trigger this error immediately.
• *** recipe commences before first target: This happens when Make encounters what it thinks is a command (recipe) but can't find a corresponding target line (like target: dependencies) above it. It usually means your syntax is mixed up, so Make can't tell what's a target and what's a command.

Common Mistakes to Check in Your Modified Line 41 #

Since the issue is isolated to line 41 after your edit, let's walk through the most likely culprits:

1. Incorrect Indentation (Even If You Think You Used a Tab)
   Make is extremely picky about Tabs vs. spaces. Many editors auto-convert Tabs to spaces by default—so double-check by enabling "show invisible characters" in your editor (VS Code: toggle "Control Characters" in the view menu; Vim: run :set list).

   • If line 41 uses spaces instead of a Tab: Replace them with a single Tab.
   • If you mixed spaces and Tabs: Clean it up to use only one Tab at the start of the command.

2. Broken Target-Command Structure
   Compare your modified line 41 to the original in the GitHub device tree:

   • Original line 41 likely follows this structure:

     some-target: dependency1 dependency2
     	@echo "Running command"  # This line starts with a Tab
     

   • If you deleted or modified the target line (the one ending with :) above line 41, Make will see your command as a floating recipe with no target, triggering the "commences before first target" error.
   • If you added extra characters or forgot the : in the target line, Make can't recognize it as a valid target, leading to the same issue.

3. Accidental Recipe vs. Variable Assignment
   If you were modifying a variable (like CFLAGS += -O2) but added a Tab before it, Make will treat the variable line as a recipe. Variable assignments need to use spaces (not Tabs) for indentation. For example:

   • Wrong:

     CFLAGS += -O2  # Tab here makes it a recipe
     

   • Correct:

     CFLAGS += -O2  # No Tab, just regular spacing
     

Quick Debugging Trick #

Run your build with extra verbosity to get clearer context:

make --warn-undefined-variables --debug=b

This will print detailed info about how Make parses each line, helping you pinpoint exactly where the syntax breaks down.

内容的提问来源于stack exchange，提问作者Chinmay Dalal