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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/5268">#5268</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; 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">With GCC 14, multiple BSPs get a linking warning for using a stub __sync_synchronize method based on the multilib of the GCC support libraries linked against. This is the warning:</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;">/home/joel/rtems-work/tools/next-gcc14/bin/../lib/gcc/arm-rtems7/14.3.0/../../../../arm-rtems7/bin/ld: ./librtemstest.a(t-test.c.80.o): in function `T_output_buffer_fill':</span>
<span id="LC2" class="line" lang="plaintext">/home/joel/rtems-work/rtems/build/arm/rtl22xx/../../../cpukit/libtest/t-test.c:235:(.text.T_output_buffer_fill.constprop.0+0x68): warning: This implementation of __sync_synchronize is a stub with no effect. Relink with</span>
<span id="LC3" class="line" lang="plaintext"> -specs=sync-{none,dmb,cp15dmb}.specs</span>
<span id="LC4" class="line" lang="plaintext">to specify exactly which barrier format to use and avoid this warning</span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">This is the list of BSPs reporting this as of GCC 14.</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-beagleboardorig</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-beagleboardxm</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-beagleboneblack</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-beaglebonewhite</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-csb336</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-csb337</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-csb637</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-edb7312</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-gumstix</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-kit637_v6</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc2362</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc23xx_tli800</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc24xx_ea</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc24xx_ncs_ram</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc24xx_ncs_rom_ext</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc24xx_ncs_rom_int</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc24xx_plx800_ram</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc24xx_plx800_rom_int</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc32xx_mzx</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc32xx_mzx_stage_1</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc32xx_mzx_stage_2</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-lpc32xx_phycore</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-raspberrypi</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-rtl22xx</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-rtl22xx_t</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">arm-smdk2410</li>
</ul>
<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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