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| Next: <a href="Warning-Options.html#Warning-Options" accesskey="n" rel="next">Warning Options</a>, Previous: <a href="Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options.html#Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options" accesskey="p" rel="prev">Objective-C and Objective-C++ Dialect Options</a>, Up: <a href="Invoking-GCC.html#Invoking-GCC" accesskey="u" rel="up">Invoking GCC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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| <hr> |
| <a name="Options-to-Control-Diagnostic-Messages-Formatting"></a> |
| <h3 class="section">3.7 Options to Control Diagnostic Messages Formatting</h3> |
| <a name="index-options-to-control-diagnostics-formatting"></a> |
| <a name="index-diagnostic-messages"></a> |
| <a name="index-message-formatting"></a> |
| |
| <p>Traditionally, diagnostic messages have been formatted irrespective of |
| the output device’s aspect (e.g. its width, …). You can use the |
| options described below |
| to control the formatting algorithm for diagnostic messages, |
| e.g. how many characters per line, how often source location |
| information should be reported. Note that some language front ends may not |
| honor these options. |
| </p> |
| <dl compact="compact"> |
| <dt><code>-fmessage-length=<var>n</var></code></dt> |
| <dd><a name="index-fmessage_002dlength"></a> |
| <p>Try to format error messages so that they fit on lines of about <var>n</var> |
| characters. The default is 72 characters for <code>g++</code> and 0 for the rest of |
| the front ends supported by GCC. If <var>n</var> is zero, then no |
| line-wrapping is done; each error message appears on a single |
| line. |
| </p> |
| </dd> |
| <dt><code>-fdiagnostics-show-location=once</code></dt> |
| <dd><a name="index-fdiagnostics_002dshow_002dlocation"></a> |
| <p>Only meaningful in line-wrapping mode. Instructs the diagnostic messages |
| reporter to emit source location information <em>once</em>; that is, in |
| case the message is too long to fit on a single physical line and has to |
| be wrapped, the source location won’t be emitted (as prefix) again, |
| over and over, in subsequent continuation lines. This is the default |
| behavior. |
| </p> |
| </dd> |
| <dt><code>-fdiagnostics-show-location=every-line</code></dt> |
| <dd><p>Only meaningful in line-wrapping mode. Instructs the diagnostic |
| messages reporter to emit the same source location information (as |
| prefix) for physical lines that result from the process of breaking |
| a message which is too long to fit on a single line. |
| </p> |
| </dd> |
| <dt><code>-fdiagnostics-color[=<var>WHEN</var>]</code></dt> |
| <dt><code>-fno-diagnostics-color</code></dt> |
| <dd><a name="index-fdiagnostics_002dcolor"></a> |
| <a name="index-highlight_002c-color_002c-colour"></a> |
| <a name="index-GCC_005fCOLORS-environment-variable"></a> |
| <p>Use color in diagnostics. <var>WHEN</var> is ‘<samp>never</samp>’, ‘<samp>always</samp>’, |
| or ‘<samp>auto</samp>’. The default is ‘<samp>never</samp>’ if <code>GCC_COLORS</code> environment |
| variable isn’t present in the environment, and ‘<samp>auto</samp>’ otherwise. |
| ‘<samp>auto</samp>’ means to use color only when the standard error is a terminal. |
| The forms <samp>-fdiagnostics-color</samp> and <samp>-fno-diagnostics-color</samp> are |
| aliases for <samp>-fdiagnostics-color=always</samp> and |
| <samp>-fdiagnostics-color=never</samp>, respectively. |
| </p> |
| <p>The colors are defined by the environment variable <code>GCC_COLORS</code>. |
| Its value is a colon-separated list of capabilities and Select Graphic |
| Rendition (SGR) substrings. SGR commands are interpreted by the |
| terminal or terminal emulator. (See the section in the documentation |
| of your text terminal for permitted values and their meanings as |
| character attributes.) These substring values are integers in decimal |
| representation and can be concatenated with semicolons. |
| Common values to concatenate include |
| ‘<samp>1</samp>’ for bold, |
| ‘<samp>4</samp>’ for underline, |
| ‘<samp>5</samp>’ for blink, |
| ‘<samp>7</samp>’ for inverse, |
| ‘<samp>39</samp>’ for default foreground color, |
| ‘<samp>30</samp>’ to ‘<samp>37</samp>’ for foreground colors, |
| ‘<samp>90</samp>’ to ‘<samp>97</samp>’ for 16-color mode foreground colors, |
| ‘<samp>38;5;0</samp>’ to ‘<samp>38;5;255</samp>’ |
| for 88-color and 256-color modes foreground colors, |
| ‘<samp>49</samp>’ for default background color, |
| ‘<samp>40</samp>’ to ‘<samp>47</samp>’ for background colors, |
| ‘<samp>100</samp>’ to ‘<samp>107</samp>’ for 16-color mode background colors, |
| and ‘<samp>48;5;0</samp>’ to ‘<samp>48;5;255</samp>’ |
| for 88-color and 256-color modes background colors. |
| </p> |
| <p>The default <code>GCC_COLORS</code> is |
| ‘<samp>error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01</samp>’ |
| where ‘<samp>01;31</samp>’ is bold red, ‘<samp>01;35</samp>’ is bold magenta, |
| ‘<samp>01;36</samp>’ is bold cyan, ‘<samp>01;32</samp>’ is bold green and |
| ‘<samp>01</samp>’ is bold. Setting <code>GCC_COLORS</code> to the empty |
| string disables colors. |
| Supported capabilities are as follows. |
| </p> |
| <dl compact="compact"> |
| <dt><code>error=</code></dt> |
| <dd><a name="index-error-GCC_005fCOLORS-capability"></a> |
| <p>SGR substring for error: markers. |
| </p> |
| </dd> |
| <dt><code>warning=</code></dt> |
| <dd><a name="index-warning-GCC_005fCOLORS-capability"></a> |
| <p>SGR substring for warning: markers. |
| </p> |
| </dd> |
| <dt><code>note=</code></dt> |
| <dd><a name="index-note-GCC_005fCOLORS-capability"></a> |
| <p>SGR substring for note: markers. |
| </p> |
| </dd> |
| <dt><code>caret=</code></dt> |
| <dd><a name="index-caret-GCC_005fCOLORS-capability"></a> |
| <p>SGR substring for caret line. |
| </p> |
| </dd> |
| <dt><code>locus=</code></dt> |
| <dd><a name="index-locus-GCC_005fCOLORS-capability"></a> |
| <p>SGR substring for location information, ‘<samp>file:line</samp>’ or |
| ‘<samp>file:line:column</samp>’ etc. |
| </p> |
| </dd> |
| <dt><code>quote=</code></dt> |
| <dd><a name="index-quote-GCC_005fCOLORS-capability"></a> |
| <p>SGR substring for information printed within quotes. |
| </p></dd> |
| </dl> |
| |
| </dd> |
| <dt><code>-fno-diagnostics-show-option</code></dt> |
| <dd><a name="index-fno_002ddiagnostics_002dshow_002doption"></a> |
| <a name="index-fdiagnostics_002dshow_002doption"></a> |
| <p>By default, each diagnostic emitted includes text indicating the |
| command-line option that directly controls the diagnostic (if such an |
| option is known to the diagnostic machinery). Specifying the |
| <samp>-fno-diagnostics-show-option</samp> flag suppresses that behavior. |
| </p> |
| </dd> |
| <dt><code>-fno-diagnostics-show-caret</code></dt> |
| <dd><a name="index-fno_002ddiagnostics_002dshow_002dcaret"></a> |
| <a name="index-fdiagnostics_002dshow_002dcaret"></a> |
| <p>By default, each diagnostic emitted includes the original source line |
| and a caret ’^’ indicating the column. This option suppresses this |
| information. |
| </p> |
| </dd> |
| </dl> |
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| Next: <a href="Warning-Options.html#Warning-Options" accesskey="n" rel="next">Warning Options</a>, Previous: <a href="Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options.html#Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options" accesskey="p" rel="prev">Objective-C and Objective-C++ Dialect Options</a>, Up: <a href="Invoking-GCC.html#Invoking-GCC" accesskey="u" rel="up">Invoking GCC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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