Seeing as you state the error message is in VS2019, I'm assuming you are
trying to use these libraries once built from a Visual Studio/MSVC project?
If so, the issue may be that you are building V8 with one toolchain and
standard library (i.e. clang & libc++), and trying to consume with another
(i.e. MSVC and its standard library). As a simple test, can you try with
"is_clang = false", and remove the "use_*libcxx*" settings and see if this
works. (Is there a specific reason you have these libcxx settings?).
Note: You do have use_custom_libcxx set to false, but looking in the
c++.gni file I see the below, so as you have use_custom_libxx_for_host set
to true, if your current_cpu and host_cpu are the same, maybe it's still
getting set to true.
use_custom_libcxx =
use_custom_libcxx || (use_custom_libcxx_for_host && current_cpu ==
host_cpu)
To be honest, I'm not super familiar with the various permutations and flow
of settings here through the GN build system, but I do know if you mix you
C++ standard library, you're going to have a bad time trying to link across
boundaries, and it seems here that v8::platform::NewDefaultPlatform exposes
standard library types in its signature, so it would be good to rule that
out first.
- Bill
On Friday, February 14, 2020 at 10:43:40 PM UTC-8, Safe Online World Ltd.
wrote:
>
> Hello,
>
> I'm getting linking error while trying to create
> v8::platform::NewDefaultPlatform in *v8 ver 8.2.77*
>
> This my v8 build command
> call gn gen out.gn/library --args="is_debug=false is_component_build=true
> v8_use_external_startup_data=true v8_static_library=false
> use_custom_libcxx=false use_custom_libcxx_for_host=true
> v8_enable_i18n_support=false target_cpu=\"x64\""
>
> call ninja -C out.gn/library v8.dll
>
> Link lib(s)
> v8.dll.lib
> v8_libbase.dll.lib
> v8_libplatform.dll.lib
>
> Error Message by Visual Studio 2019
> class std::unique_ptr<class v8::Platform,struct std::default_delete<class
> v8::Platform> > __cdecl v8::platform::NewDefaultPlatform(int,enum v8::
> platform::IdleTaskSupport,enum v8::platform::InProcessStackDumping,class
> std::unique_ptr<class v8::TracingController,struct std::default_delete<
> class v8::TracingController> >)"
> (?NewDefaultPlatform@platform@v8@@YA?AV?$unique_ptr@VPlatform@v8@@U?$default_delete@VPlatform@v8@@@std@@@std@@HW4IdleTaskSupport@12@W4InProcessStackDumping@12@V?$unique_ptr@VTracingController@v8@@U?$default_delete@VTracingController@v8@@@std@@@4@@Z)
>
>
> Please help me to solve this problem.
>
> Regards
> Rajib Chy
>
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