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@@ -33,6 +33,24 @@ In that case copy those two files to the same directory `libv8.so` was
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installed to.
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+Pointer Compression
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+-------------------
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+
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+V8 versions 8.0 and higher enable pointer compression by default.
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+See [the design document](https://docs.google.com/document/d/10qh2-b4C5OtSg-xLwyZpEI5ZihVBPtn1xwKBbQC26yI/edit)
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+for details.
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+
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+Hence if you use one of the recent version (which you really should),
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+then you
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+
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+ a) either need to manually disable pointer compression during
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+ the build of the library by passing the
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+ `v8_enable_pointer_compression=false` flag to `v8gen.py`
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+
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+ b) or compile php-v8js with pointer compression as well, by adding
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+ `CPPFLAGS="-DV8_COMPRESS_POINTERS"` to the `./configure` call.
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+
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+
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Compile V8 5.6 and newer (using GN)
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-----------------------------------
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@@ -51,7 +69,7 @@ fetch v8
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cd v8
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# (optional) If you'd like to build a certain version:
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-git checkout 6.4.388.18
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+git checkout 8.0.426.30
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gclient sync
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# Setup GN
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@@ -83,7 +101,7 @@ cd /tmp
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git clone https://github.com/phpv8/v8js.git
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cd v8js
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phpize
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-./configure --with-v8js=/opt/v8 LDFLAGS="-lstdc++"
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+./configure --with-v8js=/opt/v8 LDFLAGS="-lstdc++" CPPFLAGS="-DV8_COMPRESS_POINTERS"
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make
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make test
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sudo make install
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Stefan Siegl