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mention pointer compression in README, closes #439

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Stefan Siegl 2020-08-21 09:48:02 +02:00
parent 6f2eeb2fc0
commit cb96e6e6cb
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1 changed files with 20 additions and 2 deletions
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22
README.Linux.md
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@ -33,6 +33,24 @@ In that case copy those two files to the same directory `libv8.so` was
installed to.
Pointer Compression
-------------------
V8 versions 8.0 and higher enable pointer compression by default.
See [the design document](https://docs.google.com/document/d/10qh2-b4C5OtSg-xLwyZpEI5ZihVBPtn1xwKBbQC26yI/edit)
for details.
Hence if you use one of the recent version (which you really should),
then you
a) either need to manually disable pointer compression during
the build of the library by passing the
`v8_enable_pointer_compression=false` flag to `v8gen.py`
b) or compile php-v8js with pointer compression as well, by adding
`CPPFLAGS="-DV8_COMPRESS_POINTERS"` to the `./configure` call.
Compile V8 5.6 and newer (using GN)
-----------------------------------
@ -51,7 +69,7 @@ fetch v8
cd v8
# (optional) If you'd like to build a certain version:
git checkout 6.4.388.18
git checkout 8.0.426.30
gclient sync
# Setup GN
@ -83,7 +101,7 @@ cd /tmp
git clone https://github.com/phpv8/v8js.git
cd v8js
phpize
./configure --with-v8js=/opt/v8 LDFLAGS="-lstdc++"
./configure --with-v8js=/opt/v8 LDFLAGS="-lstdc++" CPPFLAGS="-DV8_COMPRESS_POINTERS"
make
make test
sudo make install