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Lib/javascript/v8/javascriptrun.swg: clean up pre-processor conditions.

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Harmonize javascriptcode.swg javascripthelpers.swg and clarify
documentation.
This commit is contained in:
Andy Polyakov 2021-03-09 15:34:31 +01:00
commit b56814ce08
4 changed files with 27 additions and 33 deletions
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15
Doc/Manual/Javascript.html
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@ -89,19 +89,24 @@ $ swig -javascript -jsc example.i</pre>
<pre>
$ swig -c++ -javascript -jsc example.i</pre>
</div>
<p>The V8 code that SWIG generates should work with most versions from 3.11.10 up to 3.29.14 and later.</p>
<p>The API headers for V8 &gt;= 4.3.0 define constants which SWIG can use to
determine the V8 version it is compiling for. For versions &lt; 4.3.0, you
<p>The V8 code that SWIG generates should work with most versions from 3.11.10.
However, the only early version that receives some testing is 3.14.5, which is
still shipped with Ubuntu for some reason. Other than that it's probably safer
to assume that versions earlier than 5.0 are no longer supported. Keep in mind
that these are V8 versions, not Node.js. To give some perspective, Node.js v6.0
uses V8 5.0, v12.0 - 7.4, v14.0 - 8.1...</p>
<p>The API headers for V8 &gt;= 4.3.10 define constants which SWIG can use to
determine the V8 version it is compiling for. For versions &lt; 4.3.10, you
need to specify the V8 version when running SWIG. This is specified as a hex
constant, but the constant is read as pairs of decimal digits, so for V8
3.25.30 use constant 0x032530. This scheme can't represent components &gt; 99,
but this constant is only useful for V8 &lt; 4.3.0, and no V8 versions from
but this constant is only useful for V8 &lt; 4.3.10, and no V8 versions from
that era had a component &gt; 99. For example:</p>
<div class="shell">
<pre>
$ swig -c++ -javascript -v8 -DV8_VERSION=0x032530 example.i</pre>
</div>
<p>If you're targeting V8 &gt;= 4.3.0, you would just run swig like so:</p>
<p>If you're targeting V8 &gt;= 4.3.10, you would just run swig like so:</p>
<div class="shell">
<pre>
$ swig -c++ -javascript -v8 example.i</pre>