[bug] Cross compiling with dual profile breaks with fPIC

I’m unable to use almost any package when cross compiling from Windows to Android.

It seems like the

   def config_options(self):
        if self.settings.os == "Windows":
            del self.options.fPIC

pattern that is used in almost all recipes breaks when I try use the new --profile:host/--profile:build logic to cross compile on Windows…

As a work around I tried to replace the config_options logic with:

    def package_id(self):
        if self.settings.os == "Windows":
            del self.info.options.fPIC

and it seems to work. It feels like a hack though.

I first create an issue in CCI (https://github.com/conan-io/conan-center-index/issues/4483) but I think it actually belongs here.

Environment Details (include every applicable attribute)

• Operating System+version: Windows 10
• Compiler+version: Visual Studio 16/Android Clang 11
• Conan version: conan 1.33.1
• Python version: Python 3.7.8

Conan profile

Configuration (profile_host):
[settings]
arch=armv8
build_type=Release
compiler=clang
compiler.libcxx=libc++
compiler.version=11
os=Android
os.api_level=22
[options]
[build_requires]
*: android-ndk/r22
[env]

Configuration (profile_build):
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=Visual Studio
compiler.runtime=MD
compiler.version=16
os=Windows
os_build=Windows
[options]
[build_requires]
[env]

Steps to reproduce (Include if Applicable)

Minimal example:

from conans import ConanFile

class fooConan(ConanFile):
    name = "foo"
    generators = "cmake", "cmake_find_package_multi"

    settings = "os", "arch", "compiler", "build_type"

    requires = (
        "protobuf/3.13.0", # to get Android libprotobuf
    )

    build_requires = (
        "protobuf/3.13.0", # to get Windows proto.exe
    )

run:

conan create . version@dirac/testing \
    --profile:host android-ndk-r20-api-21-arm64-v8a-clang-libcxx.txt \
    --profile:build default \
    --build=outdated

You get the error:

ERROR: protobuf/3.13.0: option 'fPIC' doesn't exist
Possible options are ['shared', 'with_zlib', 'lite']

Having either or of requires and build_requires works.

Logs (Include/Attach if Applicable)

Click to expand log

[HOOK - attribute_checker.py] pre_export(): WARN: Conanfile doesn't have 'url'. It is recommended to add it as attribute
[HOOK - attribute_checker.py] pre_export(): WARN: Conanfile doesn't have 'license'. It is recommended to add it as attribute
[HOOK - attribute_checker.py] pre_export(): WARN: Conanfile doesn't have 'description'. It is recommended to add it as attribute
Exporting package recipe
foo/version@dirac/testing: The stored package has not changed
foo/version@dirac/testing: Exported revision: fb9a654636e5e59257bc4d6b6fffaa74
Configuration (profile_host):
[settings]
arch=armv8
build_type=Release
compiler=clang
compiler.libcxx=libc++
compiler.version=11
os=Android
os.api_level=22
[options]
[build_requires]
*: android-ndk/r22
[env]

Configuration (profile_build):
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=Visual Studio
compiler.runtime=MD
compiler.version=16
os=Windows
os_build=Windows
[options]
[build_requires]
[env]

android-ndk/r22: Package is up to date
ERROR: protobuf/3.13.0: option 'fPIC' doesn't exist
Possible options are ['shared', 'with_zlib', 'lite']

[ytimenkov]

host context are being propagated to the protobuf that is as build_requires

Sounds similar to my issue: https://github.com/conan-io/conan-center-index/issues/4013 (and this one, names lockfiles but related to building a graph when same package is in build and ordinary requirement: https://github.com/conan-io/conan/issues/8335)

[czoido]

Hi @anton-dirac, Thanks a lot for reporting, I have been able to reproduce the issue. Looks like the options of the host context are being propagated to the protobuf that is as build_requires in the build context making the build fail. I will mark this as a bug and we will try to understand what’s happening there and what can we do to solve it.