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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/4370/">https://reviewboard.asterisk.org/r/4370/</a>
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<p style="margin-top: 0;">On January 26th, 2015, 6:36 a.m. CET, <b>Diederik de Groot</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4370/diff/1/?file=71056#file71056line44" style="color: black; font-weight: bold; text-decoration: underline;">/branches/11/include/asterisk/inline_api.h</a>
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(Diff revision 1)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> Note that Clang uses different semantics for the inline keyword</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> which causes it to view 'extern inline' as a re-definition.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> Since Clang views inline as a mild suggestion, we currently</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> have it ignore it.</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cp">#if !defined(LOW_MEMORY)</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cp">#if !defined(LOW_MEMORY)<span class="hl"> && !defined(__clang__)</span></span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You might want to check out:
#define forceinline __inline__ __attribute__((always_inline))
#define ensure_forceinline __attribute__((always_inline)) // inline or die
To see if they would help forcing clang to inline</pre>
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<p>On February 20th, 2015, 5:08 a.m. CET, <b>Matt Jordan</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I gave it a shot, and clang still believes that the functions are re-defined.
There may be a magical invocation to get clang to believe that these inlinings should occur, but I'm not sure what it is.</pre>
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<p>On February 20th, 2015, 2:18 p.m. CET, <b>Diederik de Groot</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I was intriged by the inline issue a little. There must be some solution. Declaring the function static ought to help against the multiple definition warning. Be cause the goal is to inline the function, we already expect the function content to be replicated all over the place, so the argument in the comment in include/asterisk/inline_api.h line 30 doesn't completely hold up.
For the non-inlined version, static will not really be problematic, as the clang compiler (even in -O0 mode) will optimize the multiple declarations out (as opposed to gcc, which would not do this in -O0 mode, resulting in a bigger binary then necessary).
So:
--- include/asterisk/inline_api.h 2015-02-20 14:11:49.011228989 +0100
+++ include/asterisk/inline_api.h~ 2015-02-20 14:11:38.000000000 +0100
@@ -52,7 +52,7 @@
#if !defined(AST_API_MODULE)
#if defined(__clang__)
-#define AST_INLINE_API(hdr, body) static hdr; static inline hdr body
+#define AST_INLINE_API(hdr, body) static hdr; static forceinline hdr body
#else
#define AST_INLINE_API(hdr, body) hdr; extern inline hdr body
#endif
Seems to do the trick, as far as i can tell. Can you verify this ?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Diff went a little astray:
Final result should have looked like:
#if !defined(AST_API_MODULE)
#if defined(__clang__)
#define AST_INLINE_API(hdr, body) static hdr; static inline hdr body
#else
#define AST_INLINE_API(hdr, body) hdr; extern inline hdr body
#endif
#else
#define AST_INLINE_API(hdr, body) hdr; hdr body
#endif
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<p>- Diederik</p>
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<p>On February 20th, 2015, 5:09 a.m. CET, Matt Jordan wrote:</p>
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<div>Review request for Asterisk Developers and Diederik de Groot.</div>
<div>By Matt Jordan.</div>
<p style="color: grey;"><i>Updated Feb. 20, 2015, 5:09 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-20850">ASTERISK-20850</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is a continuation of the patch put up for review on r3488. It addresses the issues found on that review.
This patch *should* make Asterisk compile under clang. Note that compiling with --enable-dev-mode will cause Asterisk to fail to compile under clang, as it detects a number of warnings that aren't fixed under this patch.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">* Compiled Asterisk with and without --enable-dev-mode using gcc. Asterisk compiles correctly.
* Compiled Asterisk without --enable-dev-mode using clang. Asterisk compiles, links, and executes.
Note that you will need the BlocksRuntime to run Asterisk when it is compiled with clang.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/11/makeopts.in <span style="color: grey">(432011)</span></li>
<li>/branches/11/main/Makefile <span style="color: grey">(432011)</span></li>
<li>/branches/11/include/asterisk/utils.h <span style="color: grey">(432011)</span></li>
<li>/branches/11/include/asterisk/inline_api.h <span style="color: grey">(432011)</span></li>
<li>/branches/11/configure.ac <span style="color: grey">(432011)</span></li>
<li>/branches/11/configure <span style="color: grey">(UNKNOWN)</span></li>
<li>/branches/11/Makefile <span style="color: grey">(432011)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4370/diff/" style="margin-left: 3em;">View Diff</a></p>
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