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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a>
commented:
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<p dir="auto">Try something like this ?</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"># check for gcc's atomic read-add-write functionality</span>
<span id="LC2" class="line" lang="plaintext">AC_MSG_CHECKING([for __sync_fetch_and_add (int)])</span>
<span id="LC3" class="line" lang="plaintext">AC_LINK_IFELSE(</span>
<span id="LC4" class="line" lang="plaintext"> [AC_LANG_SOURCE([</span>
<span id="LC5" class="line" lang="plaintext"> int main(void) { return __sync_fetch_and_add((int *)0, 0); }</span>
<span id="LC6" class="line" lang="plaintext"> ])],</span>
<span id="LC7" class="line" lang="plaintext"> [AC_DEFINE([WITH_SYNC_FETCH_AND_ADD], [1], [use __sync_fetch_and_add]) AC_MSG_RESULT([yes])],</span>
<span id="LC8" class="line" lang="plaintext"> [AC_MSG_RESULT([no])]</span>
<span id="LC9" class="line" lang="plaintext">)</span></code></pre>
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