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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang does not define __GNUC_GNU_INLINE__"
href="https://bugs.llvm.org/show_bug.cgi?id=37784">37784</a>
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<th>Summary</th>
<td>clang does not define __GNUC_GNU_INLINE__
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>ndesaulniers@google.com
</td>
</tr>
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<th>CC</th>
<td>llozano@chromium.org, llvm-bugs@lists.llvm.org, manojgupta@google.com, srhines@google.com
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<p>
<div>
<pre>In the linux kernel, we prefer to use gnu89 semantics for extern inline
functions. Writing a feature test for the attribute gnu_inline should be
straightforward, except that gcc did not get __has_attribute until 5.1.
Instead, older versions of gcc define __GNUC_GNU_INLINE__ if that attribute is
supported. It seems that clang does not, which makes writing a feature test a
little wonky:
#ifdef __GNUC_GNU_INLINE__
#define __gnu_inline __attribute__((gnu_inline))
#else
#define __gnu_inline
#warning "No gnu inline"
#endif
produces a warning in clang.
We can likely work around this via:
#ifndef __has_attribute // Optional of course.
#define __has_attribute(x) 0 // Compatibility with non-clang compilers.
#endif
#if defined(__GNUC_GNU_INLINE__) || __has_attribute(gnu_inline)
#define __gnu_inline __attribute__(gnu_inline)
#endif</pre>
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