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MPLAB XC-DSC C Compiler User's Guide

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6 Compiler Command-Line Driver
6.6 Driver Option Descriptions
6.6.4 Options for Controlling Warnings and Errors
6.6.4.1 Options to Control the Amount and Types of Warnings
6.6.4.1.9 -Wimplicit-function-declaration

Notice to Development Tools Customers
1 Preface
2 Compiler Overview
3 Compiler and Other Development Tools
4 How To's
5 XC-DSC Toolchain and MPLAB® X IDE
6 Compiler Command-Line Driver
7 Device-Related Features
8 Differences Between MPLAB® XC-DSC and C Standard
9 Supported Data Types and Variables
10 Fixed-Point Arithmetic Support - dsPIC33C/E/F and dsPIC30 Only
11 Memory Allocation and Access
12 Operators and Statements
13 Register Usage
14 Functions
15 Interrupts
16 Main, Runtime Startup and Reset
17 Mixing C and Assembly Code
18 Library Routines
19 Optimizations
20 Preprocessing
21 Linking Programs
22 Implementation-Defined Behavior
23 Embedded Compiler Compatibility Mode
24 Common C Interface
25 Diagnostic Pragmas
26 Diagnostic Messages
27 GNU Free Documentation License
28 Built-in Functions
29 Document Revision History
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6.6.4.1.9 -Wimplicit-function-declaration

Give a warning whenever a function is used before being declared.

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