[package] boost/1.75.0: Boost.Locale is not built with i18n_backend=icu

[theodelrieu]

Hello,

It seems this commit (552189c144dea0ef9287c208a2cc5cf03a568e62) broke Boost.Locale build. It was working well two weeks ago.

Package and Environment Details (include every applicable attribute)

• Package Name/Version: boost/1.75.0
• Operating System+version: macOS x86_64 BigSur
• Compiler+version: apple-clang 12.0
• Conan version: conan 1.32.1
• Python version: Python 3.8.5

Steps to reproduce (Include if Applicable)

conan install boost/1.75.0@ --build missing -o boost:i18n_backend=icu -o boost:without_locale=False

Logs (Include/Attach if Applicable)

Click to expand log

b2 output ``` - has statx syscall : no - has_icu builds : no - zlib : yes - bzip2 : yes - icu : no - icu (lib64) : no - Boost.Locale needs either iconv or ICU library to be built. - Boost.Locale needs either iconv or ICU library to be built. ``` conan output ``` boost/1.75.0: WARN: Boost component 'locale' is missing libraries. Try building boost with '-o boost:without_locale'. ERROR: boost/1.75.0: Error in package_info() method, line 1331 raise ConanException("These libraries were expected to be built, but were not built: {}".format(non_built)) ConanException: These libraries were expected to be built, but were not built: {'boost_locale'} ```

[theodelrieu]

I've dug a bit and I've another build issue on Windows, Boost.Locale ICU detection is broken for several reasons:

• It looks for icuXX lib names, but on Windows ICU adds prefixes and suffixes
• One could pass ICU_LINK to workaround that, but Boost.Regex emits an error when ICU_LINK is defined (https://github.com/boostorg/regex/commit/fc4dc17dc745a9fc4ab1849cef3710354a6b7782#diff-322788b77c72dedcc9b4a12bf0233ceb8451b4a6baa6d851173ecd5320ac14aeR38)

There's several solutions:

• Strip prefixes/suffixes from ICU lib names
• Patch Boost.Locale Jamfile.v2 to take a LOCALE_ICU_LINK var, and pass the correct link flags to it

I'd like to hear your input on this, thanks.

[Cogitri]

Unfortunately I've hit this too, even with boost:i18n_backend_icu=True set boost::locale:::localization_backend_manager::global().get_all_backends() returns an empty vector.

[Cogitri]

Actually, it appears that the ICU backend works when building with boost:shared=True and ich:shared=True

[uilianries]

Closing this issue due its age and the reported error seems be gone:

Full build logs checking the current issue are available here: https://gist.github.com/uilianries/17bc2863edbcb00f999da1ffb7b8318c

Please, feel free to re-open it in case this error still persists.