[question] How to choose which cmake version to use for build()?

• conan install .. --build missing
• Centos 7 (cmake is defaulted to cmake2)

How can I change the command to use?

Adding conan_cmake_program = cmake3 # environment CONAN_CMAKE_PROGRAM (overrides the make program used in CMake.cmake_program) in conan.conf didn’t change anything, it still uses cmake.

[czoido]

Hi @alexisfrjp,

In that case, you can try to prepend a path to the PATH where you create a symbolink link to the cmake3 binary and then add a [buildenv] section to your profile. For example:

mkdir ~/cmake3_symfolder
ln -s /usr/bin/cmake3 ~/cmake3_symfolder/cmake

Add the buildenv section to your profile, the folder will be prepended to the path each time Conan invokes the build() method (the (path) keyword stands for the current PATH variable):

[settings]
...
[buildenv]
PATH=+(path)~/cmake3_symfolder

Be aware that you have to set: tools.env.virtualenv:auto_use=True configuration so that this is automatically applied to the build. You can do that in the command line:

conan create . --profile=./<profile_with_buildenv> -c tools.env.virtualenv:auto_use=True

or adding it to the global.conf file.

Hope this helps.

[czoido]

Hi @alexisfrjp,

Be aware that the CONAN_CMAKE_PROGRAM environment variable does not work with the new integrations that are imported from the module conan, just for the old one that is imported from the module conans (note the extra ‘s’). So if you have in your recipe something like “from conan.tools.cmake import CMake” that may be the reason that the variable is not affecting the cmake run by build().

Anyway, at Conan level, what you can do is use a tool_requires in your profile, so that it will affect all the packages that need to be built. You can do that by adding setting something like:

[tool_requires]
cmake/3.23.2

Conan Center Index has CMake packages for versions that vary from 3.15, to 3.23, so you can select the one that is more adequate for you.

Hope this helps.