Coding⏱️ 3 min read📅 2026-06-04

How to Fix: "multiple target patterns" Makefile error

Makefile error fix: multiple target patterns

Quick Answer: Check for colon in variable names, and avoid using shell commands to set variables.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The 'multiple target patterns' error in Makefile is typically encountered when a single rule is defined with multiple target specifications. This can happen due to incorrect syntax or unexpected input from shell commands. The error message indicates that GNU make has detected multiple target patterns in the same rule, which causes it to stop processing and report an error.

This issue can be frustrating as it prevents the Makefile from compiling successfully. However, identifying and fixing the root cause of this problem is crucial for resolving the error.

🛑 Root Causes of the Error

  • The primary reason for this error is when a single rule is defined with multiple target specifications. For example, if you have a rule like $(FOO): bar where FOO is set from a shell command that contains an error message with a colon (:) character.
  • Another alternative reason could be when the Makefile contains a pattern rule with multiple target specifications, which can also trigger this error.

✅ Best Solutions to Fix It

Fixing Multiple Target Patterns by Correcting Rule Syntax

  1. Step 1: Step 1: Review your Makefile to identify any rules that contain multiple target specifications. Look for rules where the target specification contains a colon (:) character or is separated by spaces.
  2. Step 2: Step 2: Correctly define each rule with a single target specification. Ensure that the target name does not contain any characters that could be interpreted as a colon (:) character, such as colons, semicolons (;), or backslashes ( ).
  3. Step 3: Step 3: Test your corrected Makefile to verify that it compiles successfully without encountering the 'multiple target patterns' error.

Alternative Fix Method Using Pattern Rules

  1. Step 1: Step 1: Identify pattern rules in your Makefile that contain multiple target specifications. These types of rules can be tricky to diagnose and fix.
  2. Step 2: Step 2: Rewrite the pattern rule to use a single target specification, ensuring that the target name is correctly formatted without any characters that could trigger the error. You may need to use wildcard patterns or other techniques to achieve this.
  3. Step 3: Step 3: Verify that your corrected Makefile compiles successfully using the alternative fix method.

🎯 Final Words

By following these steps and correcting the syntax of your Makefile, you should be able to resolve the 'multiple target patterns' error. Remember to test your corrected Makefile thoroughly to ensure that it produces the desired output without encountering any other errors.

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