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<h3 class="section">2.17 Control Warnings: <samp><span class="option">-W</span></samp>, <samp><span class="option">--warn</span></samp>, <samp><span class="option">--no-warn</span></samp>, <samp><span class="option">--fatal-warnings</span></samp></h3>

<p><samp><span class="command">as</span></samp> should never give a warning or error message when
assembling compiler output.  But programs written by people often
cause <samp><span class="command">as</span></samp> to give a warning that a particular assumption was
made.  All such warnings are directed to the standard error file.

   <p><a name="index-g_t_002dW-103"></a><a name="index-g_t_002d_002dno_002dwarn-104"></a><a name="index-suppressing-warnings-105"></a><a name="index-warnings_002c-suppressing-106"></a>If you use the <samp><span class="option">-W</span></samp> and <samp><span class="option">--no-warn</span></samp> options, no warnings are issued. 
This only affects the warning messages: it does not change any particular of
how <samp><span class="command">as</span></samp> assembles your file.  Errors, which stop the assembly,
are still reported.

   <p><a name="index-g_t_002d_002dfatal_002dwarnings-107"></a><a name="index-errors_002c-caused-by-warnings-108"></a><a name="index-warnings_002c-causing-error-109"></a>If you use the <samp><span class="option">--fatal-warnings</span></samp> option, <samp><span class="command">as</span></samp> considers
files that generate warnings to be in error.

   <p><a name="index-g_t_002d_002dwarn-110"></a><a name="index-warnings_002c-switching-on-111"></a>You can switch these options off again by specifying <samp><span class="option">--warn</span></samp>, which
causes warnings to be output as usual.

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