Improve error message for cmake failure (#71404)

I ran into this error as a newbie, was educated
[here](https://discord.com/channels/636084430946959380/642426447167881246/1171016269387018310).
Updating the error message to be more descriptive about the problem and
my options.
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Jeremy Kun 2023-11-07 00:54:04 -08:00 committed by GitHub
parent 6b573f4611
commit ebc3302725
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@ -113,7 +113,12 @@ function(llvm_check_source_file_list)
else()
set(fn_relative "${fn}")
endif()
message(SEND_ERROR "Found unknown source file ${fn_relative}
message(SEND_ERROR "Found erroneous configuration for source file ${fn_relative}
LLVM's build system enforces that all source files are added to a build target, \
that exactly one build target exists in each directory, \
and that this target lists all files in that directory. \
If you want multiple targets in the same directory, add \
PARTIAL_SOURCES_INTENDED to the target specification, though it is discouraged.
Please update ${CMAKE_CURRENT_LIST_FILE}\n")
endif()
endif()