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| This file documents the GNU Assembler "as". |
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| <h3 class="section">1.7 Error and Warning Messages</h3> |
| |
| <!-- man begin DESCRIPTION --> |
| <p><a name="index-error-messages-40"></a><a name="index-warning-messages-41"></a><a name="index-messages-from-assembler-42"></a><samp><span class="command">as</span></samp> may write warnings and error messages to the standard error |
| file (usually your terminal). This should not happen when a compiler |
| runs <samp><span class="command">as</span></samp> automatically. Warnings report an assumption made so |
| that <samp><span class="command">as</span></samp> could keep assembling a flawed program; errors report a |
| grave problem that stops the assembly. |
| |
| <!-- man end --> |
| <p><a name="index-format-of-warning-messages-43"></a>Warning messages have the format |
| |
| <pre class="smallexample"> file_name:<b>NNN</b>:Warning Message Text |
| </pre> |
| <p class="noindent"><a name="index-file-names-and-line-numbers_002c-in-warnings_002ferrors-44"></a>(where <b>NNN</b> is a line number). If both a logical file name |
| (see <a href="File.html#File"><code>.file</code></a>) and a logical line number |
| (see <a href="Line.html#Line"><code>.line</code></a>) |
| have been given then they will be used, otherwise the file name and line number |
| in the current assembler source file will be used. The message text is |
| intended to be self explanatory (in the grand Unix tradition). |
| |
| <p>Note the file name must be set via the logical version of the <code>.file</code> |
| directive, not the DWARF2 version of the <code>.file</code> directive. For example: |
| |
| <pre class="smallexample"> .file 2 "bar.c" |
| error_assembler_source |
| .file "foo.c" |
| .line 30 |
| error_c_source |
| </pre> |
| <p>produces this output: |
| |
| <pre class="smallexample"> Assembler messages: |
| asm.s:2: Error: no such instruction: `error_assembler_source' |
| foo.c:31: Error: no such instruction: `error_c_source' |
| </pre> |
| <p><a name="index-format-of-error-messages-45"></a>Error messages have the format |
| |
| <pre class="smallexample"> file_name:<b>NNN</b>:FATAL:Error Message Text |
| </pre> |
| <p>The file name and line number are derived as for warning |
| messages. The actual message text may be rather less explanatory |
| because many of them aren't supposed to happen. |
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