Help with Getting started with embedding V8

[Michel Araujo]

Hi guys,

I'm trying to run the Getting started with embedding V8 - Hello World example and I got stuck with "ninja" command,
I made all previous steps but when I run (step 4 in https://v8.dev/docs/embed):

ninja -C out.gn/x64.release.sample v8_monolith

I got this erros:

../../src/compiler/turboshaft/wasm-gc-type-reducer.cc:117:18: error: 'back_insert_iterator' may not intend to support class template argument deduction [-Werror,-Wctad-maybe-unsupported]
  117 |                  std::back_insert_iterator(snapshots), [this](Block* pred) {
      |                  ^
../../build/linux/debian_bullseye_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_iterator.h:596:11: note: add a deduction guide to suppress this warning
  596 |     class back_insert_iterator
      |           ^
1 error generated.

Someone can help me?

[Matthias Liedtke]

Hi,

This seems to be an issue with the combination of GCC's standard library in combination with Clang as a compiler and the Warning -Wctad-maybe-unsupported enabled plus -Werror.

See: https://godbolt.org/z/xTbr9W1oT

You should be able to solve this issue by:

A) Adding -stdlib=libc++ to your compiler invocation.

B) Compiling with GCC.

C) Not configuring warnings as errors.

D) Switching to a newer version of the source code. The code in question has already been removed in https://chromium-review.googlesource.com/c/v8/v8/+/4980266 (although just due to the algorithm being changed).

Best regards,

Matthias

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[Matthias Liedtke]

Just to clarify, either of the 4 options should solve the issue, no need to do all of them. :)

[Michel Araujo]

Great, worked!
I open the file "BUILD.gn" and remove flag "-Wctad-maybe-unsupported"

cflags += [ "-Wctad-maybe-unsupported" ]

Now I can build e run Hello World
Thanks for the Help!