[package] zlib/1.2.11: can't compile with clang (not MSVC-clang)

[AndreyMlashkin]

Package and Environment Details (include every applicable attribute)

• Package Name/Version: zlib/1.2.11
• Operating System+version: Windows 10 docker
• Compiler+version: clang 12
• Docker image: https://github.com/AndreyMlashkin/windows-clang-conan/blob/main/Dockerfile
• Conan version: conan 1.38.0

Conan profile (output of conan profile show default or conan profile show <profile> if custom profile is in use)

[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=clang
compiler.version=12.0
os=Windows
os_build=Windows
[options]
[build_requires]
[env]
CC=clang-cl
CONAN_CMAKE_GENERATOR=Ninja
CXX=clang-cl

Steps to reproduce (Include if Applicable)

docker build .

Logs (Include/Attach if Applicable)

Click to expand log

conan install zlib/1.2.11@ --build missing
Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=clang
compiler.version=12.0
os=Windows
os_build=Windows
[options]
[build_requires]
[env]
CC=clang-cl
CONAN_CMAKE_GENERATOR=Ninja
CXX=clang-cl
zlib/1.2.11: Not found in local cache, looking in remotes...
zlib/1.2.11: Trying with 'conancenter'...
Downloading conanmanifest.txt completed [0.35k]
Downloading conanfile.py completed [5.94k]
Downloading conan_export.tgz completed [0.34k]
Decompressing conan_export.tgz completed [0.00k]
zlib/1.2.11: Downloaded recipe revision 0
Installing package: zlib/1.2.11
Requirements
    zlib/1.2.11 from 'conancenter' - Downloaded
Packages
    zlib/1.2.11:5448130be8147b3657e4a9b67d4df5c9629137b7 - Build

Installing (downloading, building) binaries...
Downloading conan_sources.tgz completed [1.14k]
Decompressing conan_sources.tgz completed [0.00k]
zlib/1.2.11: Configuring sources in C:\Users\ContainerAdministrator\.conan\data\zlib\1.2.11\_\_\source
Downloading zlib-1.2.11.tar.gz completed [593.46k]

zlib/1.2.11: Copying sources to build folder
zlib/1.2.11: Building your package in C:\Users\ContainerAdministrator\.conan\data\zlib\1.2.11\_\_\build\5448130be8147b3657e4a9b67d4df5c9629137b7
zlib/1.2.11: Generator cmake created conanbuildinfo.cmake
zlib/1.2.11: Calling build()
zlib/1.2.11:
zlib/1.2.11: ERROR: Package '5448130be8147b3657e4a9b67d4df5c9629137b7' build failed
zlib/1.2.11: WARN: Build folder C:\Users\ContainerAdministrator\.conan\data\zlib\1.2.11\_\_\build\5448130be8147b3657e4a9b67d4df5c9629137b7
ERROR: zlib/1.2.11: Error in build() method, line 75
        cmake.configure(build_folder=self._build_subfolder)
        ConanException: compiler.version setting required for vcvars not defined

[madebr]

I think you will have to bring this issue to the conan developers.

#6416 is releated.

It seems conan has 2 problems:

• clang-cl is not modeled by conan.
  • There is no settings.compiler == "clang-cl"
  • self.settings.compiler=="clang" has no option with e.g. self.settings.compiler.frontend=="msvc".
  • For Visual Studio, there exists self.settings.compiler.toolset -> "v141_clang_c2", "ClangCL".
    But this is not about toolset.
• clang-cl detection on Windows is wrong for cmake:
  https://github.com/conan-io/conan/blob/6b4728b25625a0e350cb010bd78dc761fc747000/conans/client/build/cmake.py#L223

[ruilvo]

Raise this issue in the actual conan "program" repo.

[AndreyMlashkin]

Fixed