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69<a name="Control-Warnings_003a-_002dW_002c-_002d_002dwarn_002c-_002d_002dno_002dwarn_002c-_002d_002dfatal_002dwarnings"></a>
70<h3 class="section">2.17 Control Warnings: <samp>-W</samp>, <samp>--warn</samp>, <samp>--no-warn</samp>, <samp>--fatal-warnings</samp></h3>
71
72<p><code>as</code> should never give a warning or error message when
73assembling compiler output.  But programs written by people often
74cause <code>as</code> to give a warning that a particular assumption was
75made.  All such warnings are directed to the standard error file.
76</p>
77<a name="index-_002dW"></a>
78<a name="index-_002d_002dno_002dwarn"></a>
79<a name="index-suppressing-warnings"></a>
80<a name="index-warnings_002c-suppressing"></a>
81<p>If you use the <samp>-W</samp> and <samp>--no-warn</samp> options, no warnings are issued.
82This only affects the warning messages: it does not change any particular of
83how <code>as</code> assembles your file.  Errors, which stop the assembly,
84are still reported.
85</p>
86<a name="index-_002d_002dfatal_002dwarnings"></a>
87<a name="index-errors_002c-caused-by-warnings"></a>
88<a name="index-warnings_002c-causing-error"></a>
89<p>If you use the <samp>--fatal-warnings</samp> option, <code>as</code> considers
90files that generate warnings to be in error.
91</p>
92<a name="index-_002d_002dwarn"></a>
93<a name="index-warnings_002c-switching-on"></a>
94<p>You can switch these options off again by specifying <samp>--warn</samp>, which
95causes warnings to be output as usual.
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