[package] boost/*: package_info fails if host architecture is wasm

[ovostrikov]

Description

Boost package creation fails for WebAssembly if host profile is set up correctly.

Package and Environment Details

• Package Name/Version: boost/1.80.0
• Operating System+version: WSL Ubuntu 20.04
• Compiler+version: Emscripten 3.1.24
• Conan version: conan 1.53.0
• Python version: Python 3.8.10

Conan profile

[settings]
os=Emscripten
os_build=Linux
arch=wasm
arch_build=x86_64
compiler=clang
compiler.version=15
compiler.libcxx=libc++
build_type=Release
[options]
[conf]
[build_requires]
[env]

Steps to reproduce

conanfile.txt

[requires]
boost/1.80.0
[options]
boost:without_context=True

emscripten.profile

include(default)
[settings]
os=Emscripten
arch=wasm
compiler=clang
compiler.version=15
compiler.libcxx=libc++
[options]
[env]
#setup enviroment variable for emscripten

Call
conan install . --build --profile:host=emscripten.profile --profile:build=default

package_info method fails because _b2_architecture variable is empty since wasm is not in the list of b2 supported architectures.

Logs

Click to expand log

ERROR: boost/1.80.0: Error in package_info() method, line 1586
        libsuffix_data["arch"] = f"-{self._b2_architecture[0]}{self._b2_address_model}"
        TypeError: 'NoneType' object is not subscriptable

[unfor19]

@ovostrikov are you able to build boost for wasm after the fix?

[ovostrikov]

@unfor19 Yes, although I didn't need to build all of boost, but things I need work fine