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| 22 | <title>Severity Pragmas (GNU C Language Manual)</title>
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| 31 | <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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| 32 | <link href="Pragmas.html" rel="up" title="Pragmas">
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| 33 | <link href="Optimization-Pragmas.html" rel="next" title="Optimization Pragmas">
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| 55 | </head>
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| 56 |
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| 57 | <body lang="en">
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| 58 | <span id="Severity-Pragmas"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Optimization-Pragmas.html" accesskey="n" rel="next">Optimization Pragmas</a>, Previous: <a href="Pragma-Basics.html" accesskey="p" rel="prev">Pragma Basics</a>, Up: <a href="Pragmas.html" accesskey="u" rel="up">Pragmas</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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| 61 | </div>
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| 62 | <hr>
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| 63 | <span id="Severity-Pragmas-1"></span><h4 class="subsection">30.1.2 Severity Pragmas</h4>
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| 64 |
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| 65 | <p>These pragmas control the severity of classes of diagnostics.
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| 66 | You can specify the class of diagnostic with the GCC option that causes
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| 67 | those diagnostics to be generated.
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| 68 | </p>
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| 69 | <dl compact="compact">
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| 70 | <dt><code>#pragma GCC diagnostic error <var>option</var></code></dt>
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| 71 | <dt><code>_Pragma ("GCC diagnostic error <var>option</var>")</code></dt>
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| 72 | <dd><p>For code following this pragma, treat diagnostics of the variety
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| 73 | specified by <var>option</var> as errors. For example:
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| 74 | </p>
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| 75 | <div class="example">
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| 76 | <pre class="example">_Pragma ("GCC diagnostic error -Wformat")
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| 77 | </pre></div>
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| 78 |
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| 79 | <p>specifies to treat diagnostics enabled by the <var>-Wformat</var> option
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| 80 | as errors rather than warnings.
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| 81 | </p>
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| 82 | </dd>
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| 83 | <dt><code>#pragma GCC diagnostic warning <var>option</var></code></dt>
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| 84 | <dt><code>_Pragma ("GCC diagnostic warning <var>option</var>")</code></dt>
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| 85 | <dd><p>For code following this pragma, treat diagnostics of the variety
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| 86 | specified by <var>option</var> as warnings. This overrides the
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| 87 | <var>-Werror</var> option which says to treat warnings as errors.
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| 88 | </p>
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| 89 | </dd>
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| 90 | <dt><code>#pragma GCC diagnostic ignore <var>option</var></code></dt>
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| 91 | <dt><code>_Pragma ("GCC diagnostic ignore <var>option</var>")</code></dt>
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| 92 | <dd><p>For code following this pragma, refrain from reporting any diagnostics
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| 93 | of the variety specified by <var>option</var>.
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| 94 | </p>
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| 95 | </dd>
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| 96 | <dt><code>#pragma GCC diagnostic push</code></dt>
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| 97 | <dt><code>_Pragma ("GCC diagnostic push")</code></dt>
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| 98 | <dt><code>#pragma GCC diagnostic pop</code></dt>
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| 99 | <dt><code>_Pragma ("GCC diagnostic pop")</code></dt>
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| 100 | <dd><p>These pragmas maintain a stack of states for severity settings.
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| 101 | ‘<samp>GCC diagnostic push</samp>’ saves the current settings on the stack,
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| 102 | and ‘<samp>GCC diagnostic pop</samp>’ pops the last stack item and restores
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| 103 | the current settings from that.
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| 104 | </p>
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| 105 | <p>‘<samp>GCC diagnostic pop</samp>’ when the severity setting stack is empty
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| 106 | restores the settings to what they were at the start of compilation.
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| 107 | </p>
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| 108 | <p>Here is an example:
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| 109 | </p>
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| 110 | <div class="example">
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| 111 | <pre class="example">_Pragma ("GCC diagnostic error -Wformat")
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| 112 |
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| 113 | /* <span class="roman"><samp>-Wformat</samp> messages treated as errors. </span> */
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| 114 |
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| 115 | _Pragma ("GCC diagnostic push")
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| 116 | _Pragma ("GCC diagnostic warning -Wformat")
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| 117 |
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| 118 | /* <span class="roman"><samp>-Wformat</samp> messages treated as warnings. </span> */
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| 119 |
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| 120 | _Pragma ("GCC diagnostic push")
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| 121 | _Pragma ("GCC diagnostic ignored -Wformat")
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| 122 |
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| 123 | /* <span class="roman"><samp>-Wformat</samp> messages suppressed. </span> */
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| 124 |
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| 125 | _Pragma ("GCC diagnostic pop")
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| 126 |
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| 127 | /* <span class="roman"><samp>-Wformat</samp> messages treated as warnings again. </span> */
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| 128 |
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| 129 | _Pragma ("GCC diagnostic pop")
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| 130 |
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| 131 | /* <span class="roman"><samp>-Wformat</samp> messages treated as errors again. </span> */
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| 132 |
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| 133 | /* <span class="roman">This is an excess ‘<samp>pop</samp>’ that matches no ‘<samp>push</samp>’. </span> */
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| 134 | _Pragma ("GCC diagnostic pop")
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| 135 |
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| 136 | /* <span class="roman"><samp>-Wformat</samp> messages treated once again</span>
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| 137 | <span class="roman">as specified by the GCC command-line options.</span> */
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| 138 | </pre></div>
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| 139 | </dd>
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| 140 | </dl>
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| 141 |
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| 142 | <hr>
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| 143 | <div class="header">
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| 144 | <p>
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| 145 | Next: <a href="Optimization-Pragmas.html" accesskey="n" rel="next">Optimization Pragmas</a>, Previous: <a href="Pragma-Basics.html" accesskey="p" rel="prev">Pragma Basics</a>, Up: <a href="Pragmas.html" accesskey="u" rel="up">Pragmas</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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