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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/5327">#5327</a>
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Assignee: Joel Sherrill
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<a href="#summary" aria-hidden="true" class="anchor" id="user-content-summary" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Summary</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">RTEMS builds do not use the -std= compiler option except for a few specific cases shown below. Because of this builds are done using the default C language version for the GCC version in use.</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; 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; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; 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; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">rtems]$ grep -r std= spec/</span>
<span id="LC2" class="line" lang="plaintext">spec/build/cpukit/librtemscxx.yml:- -std=c++17</span>
<span id="LC3" class="line" lang="plaintext">spec/build/testsuites/libtests/rcxx01.yml:- -std=c++17</span>
<span id="LC4" class="line" lang="plaintext">spec/build/testsuites/sptests/spcxx01.yml:- -std=gnu++17</span>
<span id="LC5" class="line" lang="plaintext">spec/build/testsuites/sptests/spstdc17.yml:- -std=c17</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I was looking into this because the published POSIX Issue 8 is based on C17, not C11 as drafts were.</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">GCC 13 defaults to C17.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">GCC 15 defaults to C23.</li>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">The autoconf build system did not specify the C Language version either.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I really believe that we should have been specifying this all along but somehow this got missed.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I have been building with both versions and we can build with either language version with -Werror. We just need to make a decision which we want to build against and add this option to the RTEMS compiler flags.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I don't particular have a preference for C17 or C23 for 7. But if we change 6 to specify the version, it should be C17 so we are not changing released behavior.</p>
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<a href="#pre-set-options" aria-hidden="true" class="anchor" id="user-content-pre-set-options" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Pre-set options</h3>
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