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<a href="https://gitlab.rtems.org/joel">Joel Sherrill</a> created an issue: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5263">#5263</a>
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<a href="#summary" aria-hidden="true" class="anchor" id="user-content-summary" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Summary</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Newer GCC versions have turned K&R old-style function definitions into at least warnings. The zlib version in RTEMS has almost 100 warnings of this type. Hopefully it can be updated to eliminate these. Here is an example of one.</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">In file included from ../../../cpukit/include/zlib.h:34,</span>
<span id="LC2" class="line" lang="plaintext"> from ../../../cpukit/compression/zlib/zutil.h:22,</span>
<span id="LC3" class="line" lang="plaintext"> from ../../../cpukit/compression/zlib/zutil.c:8:</span>
<span id="LC4" class="line" lang="plaintext">../../../cpukit/compression/zlib/zutil.c: In function 'z_zError':</span>
<span id="LC5" class="line" lang="plaintext">../../../cpukit/include/zconf.h:139:33: warning: old-style function definition [-Wold-style-definition]</span>
<span id="LC6" class="line" lang="plaintext"> 139 | # define zError z_zError</span>
<span id="LC7" class="line" lang="plaintext"> | ^~~~~~~~</span>
<span id="LC8" class="line" lang="plaintext">../../../cpukit/compression/zlib/zutil.c:135:22: note: in expansion of macro 'zError'</span>
<span id="LC9" class="line" lang="plaintext"> 135 | const char * ZEXPORT zError(err)</span></code></pre>
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<a href="#steps-to-reproduce" aria-hidden="true" class="anchor" id="user-content-steps-to-reproduce" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Steps to reproduce</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Compile with GCC 15.</p>
<h3 dir="auto" style="font-size: 1.3em; margin: 24px 0 0;" align="initial">
<a href="#pre-set-options" aria-hidden="true" class="anchor" id="user-content-pre-set-options" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Pre-set options</h3>
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<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5263">View it on GitLab</a>.
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