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<title>Language Independent Options - Using the GNU Compiler Collection (GCC)</title>
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Next: <a rel="next" accesskey="n" href="Warning-Options.html#Warning-Options">Warning Options</a>,
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Previous: <a rel="previous" accesskey="p" href="Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options.html#Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options">Objective-C and Objective-C++ Dialect Options</a>,
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</div>
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<h3 class="section">3.7 Options to Control Diagnostic Messages Formatting</h3>
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<p><a name="index-options-to-control-diagnostics-formatting-257"></a><a name="index-diagnostic-messages-258"></a><a name="index-message-formatting-259"></a>
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Traditionally, diagnostic messages have been formatted irrespective of
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the output device's aspect (e.g. its width, <small class="dots">...</small>). You can use the
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options described below
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to control the formatting algorithm for diagnostic messages,
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e.g. how many characters per line, how often source location
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information should be reported. Note that some language front ends may not
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honor these options.
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<dl>
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<dt><code>-fmessage-length=</code><var>n</var><dd><a name="index-fmessage_002dlength-260"></a>Try to format error messages so that they fit on lines of about
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<var>n</var> characters. If <var>n</var> is zero, then no line-wrapping is
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done; each error message appears on a single line. This is the
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default for all front ends.
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<br><dt><code>-fdiagnostics-show-location=once</code><dd><a name="index-fdiagnostics_002dshow_002dlocation-261"></a>Only meaningful in line-wrapping mode. Instructs the diagnostic messages
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reporter to emit source location information <em>once</em>; that is, in
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case the message is too long to fit on a single physical line and has to
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be wrapped, the source location won't be emitted (as prefix) again,
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over and over, in subsequent continuation lines. This is the default
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behavior.
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<br><dt><code>-fdiagnostics-show-location=every-line</code><dd>Only meaningful in line-wrapping mode. Instructs the diagnostic
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messages reporter to emit the same source location information (as
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prefix) for physical lines that result from the process of breaking
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a message which is too long to fit on a single line.
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<br><dt><code>-fdiagnostics-color[=</code><var>WHEN</var><code>]</code><dt><code>-fno-diagnostics-color</code><dd><a name="index-fdiagnostics_002dcolor-262"></a><a name="index-highlight_002c-color_002c-colour-263"></a><a name="index-GCC_005fCOLORS-_0040r_007benvironment-variable_007d-264"></a>Use color in diagnostics. <var>WHEN</var> is ‘<samp><span class="samp">never</span></samp>’, ‘<samp><span class="samp">always</span></samp>’,
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or ‘<samp><span class="samp">auto</span></samp>’. The default depends on how the compiler has been configured,
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it can be any of the above <var>WHEN</var> options or also ‘<samp><span class="samp">never</span></samp>’
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if <samp><span class="env">GCC_COLORS</span></samp> environment variable isn't present in the environment,
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and ‘<samp><span class="samp">auto</span></samp>’ otherwise.
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‘<samp><span class="samp">auto</span></samp>’ means to use color only when the standard error is a terminal.
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The forms <samp><span class="option">-fdiagnostics-color</span></samp> and <samp><span class="option">-fno-diagnostics-color</span></samp> are
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aliases for <samp><span class="option">-fdiagnostics-color=always</span></samp> and
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<samp><span class="option">-fdiagnostics-color=never</span></samp>, respectively.
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<p>The colors are defined by the environment variable <samp><span class="env">GCC_COLORS</span></samp>.
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Its value is a colon-separated list of capabilities and Select Graphic
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Rendition (SGR) substrings. SGR commands are interpreted by the
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terminal or terminal emulator. (See the section in the documentation
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of your text terminal for permitted values and their meanings as
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character attributes.) These substring values are integers in decimal
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representation and can be concatenated with semicolons.
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Common values to concatenate include
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‘<samp><span class="samp">1</span></samp>’ for bold,
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‘<samp><span class="samp">4</span></samp>’ for underline,
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‘<samp><span class="samp">5</span></samp>’ for blink,
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‘<samp><span class="samp">7</span></samp>’ for inverse,
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‘<samp><span class="samp">39</span></samp>’ for default foreground color,
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‘<samp><span class="samp">30</span></samp>’ to ‘<samp><span class="samp">37</span></samp>’ for foreground colors,
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‘<samp><span class="samp">90</span></samp>’ to ‘<samp><span class="samp">97</span></samp>’ for 16-color mode foreground colors,
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‘<samp><span class="samp">38;5;0</span></samp>’ to ‘<samp><span class="samp">38;5;255</span></samp>’
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for 88-color and 256-color modes foreground colors,
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‘<samp><span class="samp">49</span></samp>’ for default background color,
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‘<samp><span class="samp">40</span></samp>’ to ‘<samp><span class="samp">47</span></samp>’ for background colors,
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‘<samp><span class="samp">100</span></samp>’ to ‘<samp><span class="samp">107</span></samp>’ for 16-color mode background colors,
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and ‘<samp><span class="samp">48;5;0</span></samp>’ to ‘<samp><span class="samp">48;5;255</span></samp>’
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for 88-color and 256-color modes background colors.
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<p>The default <samp><span class="env">GCC_COLORS</span></samp> is
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<pre class="smallexample"> error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01
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</pre>
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<p class="noindent">where ‘<samp><span class="samp">01;31</span></samp>’ is bold red, ‘<samp><span class="samp">01;35</span></samp>’ is bold magenta,
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‘<samp><span class="samp">01;36</span></samp>’ is bold cyan, ‘<samp><span class="samp">01;32</span></samp>’ is bold green and
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‘<samp><span class="samp">01</span></samp>’ is bold. Setting <samp><span class="env">GCC_COLORS</span></samp> to the empty
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string disables colors.
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Supported capabilities are as follows.
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<dl>
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<dt><code>error=</code><dd><a name="index-error-GCC_005fCOLORS-_0040r_007bcapability_007d-265"></a>SGR substring for error: markers.
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<br><dt><code>warning=</code><dd><a name="index-warning-GCC_005fCOLORS-_0040r_007bcapability_007d-266"></a>SGR substring for warning: markers.
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<br><dt><code>note=</code><dd><a name="index-note-GCC_005fCOLORS-_0040r_007bcapability_007d-267"></a>SGR substring for note: markers.
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<br><dt><code>caret=</code><dd><a name="index-caret-GCC_005fCOLORS-_0040r_007bcapability_007d-268"></a>SGR substring for caret line.
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<br><dt><code>locus=</code><dd><a name="index-locus-GCC_005fCOLORS-_0040r_007bcapability_007d-269"></a>SGR substring for location information, ‘<samp><span class="samp">file:line</span></samp>’ or
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‘<samp><span class="samp">file:line:column</span></samp>’ etc.
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<br><dt><code>quote=</code><dd><a name="index-quote-GCC_005fCOLORS-_0040r_007bcapability_007d-270"></a>SGR substring for information printed within quotes.
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</dl>
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<br><dt><code>-fno-diagnostics-show-option</code><dd><a name="index-fno_002ddiagnostics_002dshow_002doption-271"></a><a name="index-fdiagnostics_002dshow_002doption-272"></a>By default, each diagnostic emitted includes text indicating the
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command-line option that directly controls the diagnostic (if such an
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option is known to the diagnostic machinery). Specifying the
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<samp><span class="option">-fno-diagnostics-show-option</span></samp> flag suppresses that behavior.
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<br><dt><code>-fno-diagnostics-show-caret</code><dd><a name="index-fno_002ddiagnostics_002dshow_002dcaret-273"></a><a name="index-fdiagnostics_002dshow_002dcaret-274"></a>By default, each diagnostic emitted includes the original source line
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and a caret '^' indicating the column. This option suppresses this
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information. The source line is truncated to <var>n</var> characters, if
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the <samp><span class="option">-fmessage-length=n</span></samp> option is given. When the output is done
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to the terminal, the width is limited to the width given by the
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<samp><span class="env">COLUMNS</span></samp> environment variable or, if not set, to the terminal width.
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</dl>
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</body></html>
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