I rebuilt it using gn. I used gn args to uncomment is_component_build and 
this sucessfully generated libv8.so on build. I then linked that and the 
libv8_libplatform.a that was generated earlier like so:
target_link_libraries(Main PUBLIC
  v8
  v8_libplatform
  icui18n
  icuuc
  rt
  dl
  pthread
)

That links fine.
On Friday, 12 August 2016 01:12:17 UTC+1, Jack wrote:
>
> When I try compiling my program on Debian using CMake I'm getting the 
> following the error:
>
> /home/jack/v8/out/native/obj.target/v8_libplatform/src/libplatform/default-platform.o:
>  
> In function `v8::platform::CreateDefaultPlatform(int)':
> ../src/libplatform/default-platform.cc:(.text._ZN2v88platform21CreateDefaultPlatformEi+0xb5):
>  
> undefined reference to `v8::base::SysInfo::NumberOfProcessors()'
> /home/jack/v8/out/native/obj.target/v8_libplatform/src/libplatform/default-platform.o:
>  
> In function `v8::platform::DefaultPlatform::SetThreadPoolSize(int)':
> ../src/libplatform/default-platform.cc:(.text._ZN2v88platform15DefaultPlatform17SetThreadPoolSizeEi+0x1a):
>  
> undefined reference to `v8::base::SysInfo::NumberOfProcessors()'
>
> Have I built v8 wrong? My CMakeLists file is like this for V8:
> link_directories(
>   ~/v8/out/native/obj.target/src
>   ~/v8/out/native/obj.target/third_party/icu
> )
> ...
> target_link_libraries(Main PUBLIC
>   v8_base
>   v8_libbase
>   v8_external_snapshot
>   v8_libplatform
>   v8_libsampler
>   icui18n
>   icuuc
>   rt
>   dl
>   pthread
> )
>
> ~/v8/out/native/obj.target/src includes the following:
> libv8_base.a  libv8_external_snapshot.a  libv8_libbase.a  
> libv8_libplatform.a  libv8_libsampler.a  libv8_nosnapshot.a
> and ~/v8/out/native/obj.target/third_party/icu contains:
> libicui18n.a  libicuuc.a
>

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