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add docs recommending to only have 1 cImport

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This commit is contained in:
Andrew Kelley 2018-01-31 20:18:47 -05:00
parent a795e4ce32
commit 3a11757d57
1 changed files with 11 additions and 0 deletions
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doc/langref.html.in
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@ -3887,6 +3887,17 @@ comptime {
<code>@cInclude</code>, <code>@cDefine</code>, and <code>@cUndef</code> work
within this expression, appending to a temporary buffer which is then parsed as C code.
</p>
<p>
Usually you should only have one <code>@cImport</code> in your entire application, because it saves the compiler
from invoking clang multiple times, and prevents inline functions from being duplicated.
</p>
<p>
Reasons for having multiple <code>@cImport</code> expressions would be:
</p>
<ul>
<li>To avoid a symbol collision, for example if foo.h and bar.h both <code>#define CONNECTION_COUNT</code></li>
<li>To analyze the C code with different preprocessor defines</li>
</ul>
{#see_also|Import from C Header File|@cInclude|@cDefine|@cUndef#}
{#header_close#}
{#header_open|@cInclude#}