fix libressl build error with Visual Studio 2022

[xyz1001]

Specify library name and version: libressl/3.0.2

Compiling libressl/3.0.2 with Visuao Studio 2022 will fail. Here are part of error output.

C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\corecrt_malloc.h(125,24): error C2485: 'constant': unrecognized extended attribute (compiling source file C:\Users\zgzf1\.conan\data\libressl\3.0.2\_\_\build\2b1be0a8976ecd1cd27d7c3d01af9a8d736344f8\source_subfolder\crypto\ui\ui_openssl_win.c) [C:\Users\zgzf1\.conan\data\libressl\3.0.2\_\_\build\2b1be0a8976ecd1 cd27d7c3d01af9a8d736344f8\source_subfolder\crypto\crypto.vcxproj]
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\corecrt_malloc.h(132,24): error C2485: 'constant': unrecognized extended attribute (compiling source file C:\Users\zgzf1\.conan\data\libressl\3.0.2\_\_\build\2b1be0a8976ecd1cd27d7c3d01af9a8d736344f8\source_subfolder\crypto\ui\ui_openssl_win.c) [C:\Users\zgzf1\.conan\data\libressl\3.0.2\_\_\build\2b1be0a8976ecd1 cd27d7c3d01af9a8d736344f8\source_subfolder\crypto\crypto.vcxproj]
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\corecrt_malloc.h(140,24): error C2485: 'constant': unrecognized extended attribute (compiling source file C:\Users\zgzf1\.conan\data\libressl\3.0.2\_\_\build\2b1be0a8976ecd1cd27d7c3d01af9a8d736344f8\source_subfolder\crypto\ui\ui_openssl_win.c) [C:\Users\zgzf1\.conan\data\libressl\3.0.2\_\_\build\2b1be0a8976ecd1 cd27d7c3d01af9a8d736344f8\source_subfolder\crypto\crypto.vcxproj]                                                                          

---

• I've read the contributing guidelines.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline

All green in build 2 (59f4b332586d51bd9c99e6a683e70a5eb41a479a):

• libressl/3.5.3@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

• libressl/3.2.1@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

• libressl/3.5.2@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

• libressl/3.0.2@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

• libressl/3.4.3@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

• libressl/2.9.2@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

• libressl/3.2.0@:
  All packages built successfully! (All logs)

  🔸 Informative: This recipe is not ready for Conan v2

  _{We have started the migration process to Conan v2 and exporting recipes successfully will be required in the future.
  This is just an informative note to gain awareness about the process, no need to take any action. The plan is to enforce smaller steps that are easier to fix and, eventually, this conan export step will work.
  See the recipe migration guide to know more about the changes required.}

  ERROR: Error loading conanfile at '/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py': Unable to load conanfile in /home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod_cci_PR-14729/recipes/libressl/all/conanfile.py", line 2, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  

[uilianries]

@xyz1001 Please, pass it directly to cmake definition in the recipe, as we a middle of a migration to Conan v2. The CMake wrapper is no longer used on Conan v2 and soon should be deprecated.

[xyz1001]

@uilianries I do not know how to add a C/C++ macro in the recipe. Is there any example?

[uilianries]

@xyz1001 No, because it should be patched to the upstream. Please, in case you identify a bug in the project, report directly to the upstream, so anyone, including the author, could have a proper hotfix.

[xyz1001]

@uilianries This bug is fixed in libressl 3.5.x. But 3.0.2 may not be fixed.

[uilianries]

@xyz1001 No problem, you can apply a patch here in CCI too. Please, take a look about patch policy: https://github.com/conan-io/conan-center-index/blob/master/docs/adding_packages/sources_and_patches.md#policy-about-patching