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Fix standalone clang builds after fb80b6b2d58.

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When clang is built against a prebuilt LLVM, LLVM_SOURCE_DIR is
empty, which due to a cmake quirk caused list lengths to get out
of sync. Add a workaround.
This commit is contained in:
Nico Weber 2020-04-03 17:15:09 -04:00
parent 2c9dae12e1
commit 4b48a417a9
1 changed files with 5 additions and 0 deletions
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5
cmake/modules/AddLLVM.cmake
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@ -1484,9 +1484,14 @@ function(configure_lit_site_cfg site_in site_out)
if (ARG_PATHS)
# Walk ARG_PATHS and collect the current value of the variables in there.
# list(APPEND) ignores empty elements exactly if the list is empty,
# so start the list with a dummy element and drop it, to make sure that
# even empty values make it into the values list.
set(ARG_PATH_VALUES "dummy")
foreach(path ${ARG_PATHS})
list(APPEND ARG_PATH_VALUES "${${path}}")
endforeach()
list(REMOVE_AT ARG_PATH_VALUES 0)
# Compute paths relative to the directory containing output lit.site.cfg.py.
# Passing ARG_PATH_VALUES as-is to execute_process() makes cmake strip