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[boost] boost/1.70: MinGW build tries to use MSVC

See original GitHub issue

Package and Environment Details

Package Name/Version: boost/1.70
Operating System+version: Windows 10 Version 1903
Compiler+version: MinGW 8.1.0
Conan version: conan 1.19.1
Python version: Python 3.7.4

Conan profile

[settings]
os=Windows
os_build=Windows
arch=x86_64
arch_build=x86_64
compiler=gcc
compiler.version=8
compiler.libcxx=libstdc++11
build_type=Release
compiler.exception=seh
compiler.threads=posix
[options]
[build_requires]
*: mingw_installer/1.0@conan/stable, msys2_installer/latest@bincrafters/stable, cmake_installer/3.14.5@conan/stable
[env]

Steps to reproduce

Using MinGW I am no longer able to build. It selects gcc as the bootstrap compiler, but somehow falls back to msvc. This was working with an earlier recipe or boost version. I never had Visual Studio installed on this system.

I am using the following configuration in the conanfile.txt:

boost:bzip2 = False
boost:namespace = boost_ns
boost:namespace_alias = True
boost:magic_autolink = True

Logs

Click to expand log

boost/1.70.0@local/testing: Calling build()
boost/1.70.0@local/testing: bootstrap.bat gcc
Bootstrapping the build engine

Bootstrapping is done. To build, run:

    .\b2 --prefix=DIR install

boost/1.70.0@local/testing: WARN: C:\.conan\8011029\1\boost_1_70_0\tools\build\b2.exe -j8 --abbreviate-paths -d2
warning: No toolsets are configured.
warning: Configuring default toolset "msvc".
warning: If the default is wrong, your build may not work correctly.
warning: Use the "toolset=xxxxx" option to override our guess.
warning: For more configuration options, please consult
warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html

warning: Did not find command for MSVC toolset. If you have Visual Studio 2017 installed you will need to specify the full path to the command, set VS150COMNTOOLS for your installation, or build from the 'Visual Studio Command Prompt for VS 2017'.