Bug#1052002: firefox: FTBFS: ERROR: Cannot find wasi headers or problem with the wasm compiler. Please fix the problem. Or build with --without-wasm-sandboxed-libraries

[Faidon Liambotis]

Control: reopen -1
Control: found -1 1:16.0.6-17

This is still not fixed :( Mike's findings still stand:

On Sat, Sep 16, 2023 at 05:53:55AM +0900, Mike Hommey wrote:
> This is a regression from the upgrade to clang 16.
> 
> with clang 14:
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/include/wasm32-wasi/c++/v1
>  /usr/lib/llvm-14/lib/clang/14.0.6/include
>  /usr/local/include
>  /usr/include/wasm32-wasi
>  /usr/include
> End of search list.
> 
> with clang 16:
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/lib/llvm-16/lib/clang/16/include
>  /usr/local/include
>  /usr/include/wasm32-wasi
>  /usr/include
> End of search list.
> 
> Note how /usr/include/wasm32-wasi/c++/v1 is missing.

Test case:
  $ apt install clang lld libclang-rt-dev-wasm32 libc++-dev-wasm32
  $ cat > hello.cpp <<EOF
  #include <iostream>
  
  int main() {
    std::cout << "hello world" << std::endl;
    return 0;
  }
  EOF
  $ /usr/bin/clang++ -v --target=wasm32-wasi hello.cpp

Only C++ include paths are affected, not C. This almost certainly has to
do with the patch we carry for wasm include paths, that I have
contributed to. Unfortunately I have no time to look into it right now
:( I may find some time in a couple of weeks, but hoping someone else
can take care of it in the meantime :/

Best,
Faidon