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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1294#note_369325885">configure.ac</a>:
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="plaintext">fi</span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="plaintext">AC_MSG_CHECKING([whether the compiler supports __builtin_available()])</span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="plaintext">AC_COMPILE_IFELSE([</span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="plaintext">  AC_LANG_PROGRAM([[</span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="plaintext">#include <stdlib.h></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext">  ]],[[</span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="plaintext">    if (__builtin_available(macOS 10.8, iOS 5.0, *)) {}</span>
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<p dir="auto">Can't this be done sorely in the C file, with <code>#if has_builtin(__builtin_available)</code>?</p>
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