Fix boost 1.86.0 recipe for x86 arch

[adaviding]

Summary

Changes to recipe: boost/1.86.0

Motivation

Fix #25864.

Details

We can see the relevant part of the build definition for boost 1.86.0 here. The token $(arch:G=) will evaluate to x86 in two conan recipe scenarios:

• settings.arch = "x86"
• settings.arch = "x86_64"

We also see an existing helper property _b2_architecture in the conan recipe here.

Therefore this change seems reasonable.

Testing

profile "win32_v192_debug.txt"

VS 2019 16.11.41

[settings]
arch=x86
build_type=Debug
compiler=msvc
compiler.runtime=dynamic
compiler.runtime_type=Debug
compiler.version=192
os=Windows

profile "x64_v192_debug.txt"

VS 2019 16.11.41

[settings]
arch=x86_64
build_type=Debug
compiler=msvc
compiler.runtime=dynamic
compiler.runtime_type=Debug
compiler.version=192
os=Windows

profile "win32_v194_debug.txt"

VS 2022 17.11.5

[settings]
arch=x86
build_type=Debug
compiler=msvc
compiler.runtime=dynamic
compiler.runtime_type=Debug
compiler.version=194
os=Windows

profile "x64_v194_debug.txt"

VS 2022 17.11.5

[settings]
arch=x86_64
build_type=Debug
compiler=msvc
compiler.runtime=dynamic
compiler.runtime_type=Debug
compiler.version=194
os=Windows

cases

Using Conan 2.9.2:

• conan create ./all --version 1.86.0 --build missing --profile:all "C:\tmp\conan_profiles\win32_v192_debug.txt"
• conan create ./all --version 1.86.0 --build missing --profile:all "C:\tmp\conan_profiles\x64_v192_debug.txt"
• conan create ./all --version 1.86.0 --build missing --profile:all "C:\tmp\conan_profiles\win32_v194_debug.txt"
• conan create ./all --version 1.86.0 --build missing --profile:all "C:\tmp\conan_profiles\x64_v194_debug.txt"

---

• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

[uilianries]

LGTM. B2 x86 covers both x86 and x86_64: https://www.boost.org/doc/libs/1_86_0/tools/build/doc/html/index.html#bbv2.overview.builtins.features

[jcar87]

Thanks @adaviding - please be aware that as of this week we have stopped supporting Conan 1.x in Conan Center - so while the fix is correct, it will only be made available for Conan 2.x onwards.

[adaviding]

@pya102 @robomics @SpaceIm @tpaustian I need one more review for this PR. Looking at the commit history for boost, you are the last 4 (besides Uilian) to touch it. I just need 1 of you.

BTW -- GitHub does not allow me to request a review in the normal way. (It appears to be a permission issue.)

[robomics]

@adaviding I believe you need one more approval from someone with write access to this repo.
Unfortunately I am a regular user, so I cannot help you.