v8 pauses forever at 100% CPU during Context::New and mksnapshot

[you.dont....@gmail.com]

Hi,

Building v8 on centos 5 using:

scons arch=x64

Any code I link against libv8 now pauses forever at 100% CPU usage
when I call v8::Context::New()

I tried building with:

scons arch=x64 snapshot=on

This caused the build system to pause forever at 100% CPU running a
script called "mksnapshot".

Tried this using tags: 2.3.8, 2.5.9.6, branch 2.5 and trunk.

Is there a known issue with libv8 not working on Centos 5/Redhat 5?

[Vyacheslav Egorov]

What happens when you build debug version of v8?

scons arch=x64 shapshot=on mode=debug

Which version of GCC you are using?

--
Vyacheslav Egorov

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[you.dont....@gmail.com]

Thanks for responding quickly.

I'm using gcc 4.5.1.

When I compile using "mode=debug" then mksnapshot works fine and my
code stops freezing.

mode=release causes the 100% CPU freeze from at least version 2.3.8
onwards. Bad code generation using gcc 4.5.1 and -O3 maybe?

[Vyacheslav Egorov]

I think you have encountered the following issue: 

http://code.google.com/p/v8/issues/detail?id=884

--
Vyacheslav Egorov

[you.dont....@gmail.com]

Thank you,

That looks like the problem. I fixed it by adding the compiler flag "-
fno-builtin-memcpy"

Could someone with source access put a test in the scons script to set
this compiler option when the gcc version is 4.5.x? The gcc bugzilla
says this fix will be ready in gcc 4.6.

Cheers, James