44e3365775
See the docs in the new function for details. I think I found every instance of this copy pasted code. Polly could also use it, but currently does something different, so I will save the behavior change for a future revision. We get the shared, non-installed CMake modules following the pattern established in D116472. It might be good to have LLD and Flang also use this, but that would be a functional change and so I leave it as future work. Reviewed By: beanz, lebedev.ri Differential Revision: https://reviews.llvm.org/D116521
42 lines
1.9 KiB
CMake
42 lines
1.9 KiB
CMake
# Find the prefix from the `*Config.cmake` file being generated.
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#
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# When generating an installed `*Config.cmake` file, we often want to be able
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# to refer to the ancestor directory which contains all the installed files.
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#
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# We want to do this without baking in an absolute path when the config file is
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# generated, in order to allow for a "relocatable" binary distribution that
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# doesn't need to know what path it ends up being installed at when it is
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# built.
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#
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# The solution that we know the relative path that the config file will be at
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# within that prefix, like `"${prefix_var}/lib/cmake/${project}"`, so we count
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# the number of components in that path to figure out how many parent dirs we
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# need to traverse from the location of the config file to get to the prefix
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# dir.
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#
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# out_var:
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# variable to set the "return value" of the function, which is the code to
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# include in the config file under construction.
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#
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# prefix_var:
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# Name of the variable to define in the returned code (not directory for the
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# faller!) that will contain the prefix path.
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#
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# path_to_leave:
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# Path from the prefix to the config file, a relative path which we wish to
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# go up and out from to find the prefix directory.
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function(find_prefix_from_config out_var prefix_var path_to_leave)
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set(config_code
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"# Compute the installation prefix from this LLVMConfig.cmake file location."
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"get_filename_component(${prefix_var} \"\${CMAKE_CURRENT_LIST_FILE}\" PATH)")
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# Construct the proper number of get_filename_component(... PATH)
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# calls to compute the installation prefix.
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string(REGEX REPLACE "/" ";" _count "${path_to_leave}")
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foreach(p ${_count})
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list(APPEND config_code
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"get_filename_component(${prefix_var} \"\${${prefix_var}}\" PATH)")
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endforeach(p)
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string(REPLACE ";" "\n" config_code "${config_code}")
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set("${out_var}" "${config_code}" PARENT_SCOPE)
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endfunction()
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