WIP: build systems rewrite for isc25 #442
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cmelone
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Jun 3, 2025
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| Spack then automatically sets the ``-DCMAKE_INSTALL_PREFIX`` path, appends the build type (defaulting to ``RelWithDebInfo``), and enables a verbose ``Makefile`` output by default. | ||
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| Next, we add the ``rpaths`` to ``-DCMAKE_INSTALL_RPATH:STRING``. | ||
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| Finally we add to ``-DCMAKE_PREFIX_PATH:STRING`` the locations of all our dependencies so that ``CMake`` can find them. | ||
| Finally, we add the locations of our dependencies to ``-DCMAKE_PREFIX_PATH:STRING`` so ``CMake`` can find them. | ||
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| In the end our ``cmake`` line will look like this (example is ``xrootd``): | ||
| The Spack-generated ``cmake`` line will look like this (example is ``xrootd``): | ||
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| .. code-block:: console | ||
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| $ cmake $HOME/spack/var/spack/stage/xrootd-4.6.0-4ydm74kbrp4xmcgda5upn33co5pwddyk/xrootd-4.6.0 -G Unix Makefiles -DCMAKE_INSTALL_PREFIX:PATH=$HOME/spack/opt/spack/darwin-sierra-x86_64/clang-9.0.0-apple/xrootd-4.6.0-4ydm74kbrp4xmcgda5upn33co5pwddyk -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -DCMAKE_FIND_FRAMEWORK:STRING=LAST -DCMAKE_INSTALL_RPATH_USE_LINK_PATH:BOOL=FALSE -DCMAKE_INSTALL_RPATH:STRING=$HOME/spack/opt/spack/darwin-sierra-x86_64/clang-9.0.0-apple/xrootd-4.6.0-4ydm74kbrp4xmcgda5upn33co5pwddyk/lib:$HOME/spack/opt/spack/darwin-sierra-x86_64/clang-9.0.0-apple/xrootd-4.6.0-4ydm74kbrp4xmcgda5upn33co5pwddyk/lib64 -DCMAKE_PREFIX_PATH:STRING=$HOME/spack/opt/spack/darwin-sierra-x86_64/clang-9.0.0-apple/cmake-3.9.4-hally3vnbzydiwl3skxcxcbzsscaasx5 | ||
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| We can see now how ``CMake`` takes care of a lot of the boilerplate code that would have to be otherwise typed in. | ||
| We'll now explore how ``CMake`` takes care of the boilerplate code that would otherwise be manually written. |
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I think this entire cmake section needs to be rewritten. (does a user need to know the step by step of the cmake command generation by spack?)
Let's look at these defaults in the
_std_args()method of theCMakePackageclass.
this method no longer exists. what replaced it?
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