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[cmake] Limit missing external lit warning to be shown once

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When using a custom `LLVM_EXTERNAL_LIT`, it's possible the file may not exist at the CMake is generating the build. One example is LLDB standalone builds. When the external lit doesn't exist, a warning message is emitted, but the warning is printed once for every single lit target. This produces many redundant warnings.

This changes the warning to only be emitted once, controlled by a CACHE variable.

Other options are:
  1. remove the warning
  2. have callers pass an option to silence the warning if desired

See https://reviews.llvm.org/D76945 for some context.

Differential Revision: https://reviews.llvm.org/D89356
This commit is contained in:
Dave Lee 2020-10-13 17:50:02 -07:00
parent 41c38f2370
commit be14b92baf
1 changed files with 2 additions and 1 deletions
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3
cmake/modules/AddLLVM.cmake
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@ -1658,8 +1658,9 @@ function(get_llvm_lit_path base_dir file_name)
set(${file_name} ${LIT_FILE_NAME} PARENT_SCOPE)
set(${base_dir} ${LIT_BASE_DIR} PARENT_SCOPE)
return()
else()
elseif (NOT DEFINED CACHE{LLVM_EXTERNAL_LIT_MISSING_WARNED_ONCE})
message(WARNING "LLVM_EXTERNAL_LIT set to ${LLVM_EXTERNAL_LIT}, but the path does not exist.")
set(LLVM_EXTERNAL_LIT_MISSING_WARNED_ONCE YES CACHE INTERNAL "")
endif()
endif()
endif()