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hacking: add a section on preprocessor conventions
* doc/hacking.html.in (preprocessor): New section to document recently-discussed style issues. Signed-off-by: Eric Blake <eblake@redhat.com>
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HACKING
14
HACKING
@ -102,6 +102,20 @@ Usually they're in macro definitions or strings, and should be converted
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anyhow.
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Preprocessor
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============
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For variadic macros, stick with C99 syntax:
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#define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__)
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Use parenthesis when checking if a macro is defined, and use
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indentation to track nesting:
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#if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE)
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# define fallocate(a,ignored,b,c) posix_fallocate(a,b,c)
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#endif
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C types
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=======
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Use the right type.
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@ -124,6 +124,25 @@
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</p>
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<h2><a href="types">Preprocessor</a></h2>
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<p>
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For variadic macros, stick with C99 syntax:
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<pre>
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#define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__)
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</pre>
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</p>
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<p>Use parenthesis when checking if a macro is defined, and use
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indentation to track nesting:
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<pre>
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#if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE)
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# define fallocate(a,ignored,b,c) posix_fallocate(a,b,c)
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#endif
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</pre>
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</p>
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<h2><a href="types">C types</a></h2>
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<p>
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@ -405,7 +424,7 @@
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#include <limits.h>
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#if HAVE_NUMACTL Some system includes aren't supported
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#include <numa.h> everywhere so need these #if defences.
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# include <numa.h> everywhere so need these #if defences.
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#endif
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#include "internal.h" Include this first, after system includes.
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