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Dave Lee 41f946a6d2 [cmake] Limit missing external lit warning to be shown once 
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
 		2020-10-13 21:03:49 -07:00
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modules [cmake] Limit missing external lit warning to be shown once 2020-10-13 21:03:49 -07:00
platforms Explicitly specify CMAKE_AR in WinMsvc.cmake 2020-09-23 18:05:29 -07:00
README
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config-ix.cmake [CMake] Use append for CMAKE_REQUIRED_* variables 2020-09-21 23:39:56 -07:00
config.guess [cmake] configure the host triple on an Apple Silicon machine correctly 2020-06-23 21:08:11 -07:00
dummy.cpp
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nsis_icon.ico
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nsis_logo.bmp
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README 

See docs/CMake.html for instructions on how to build LLVM with CMake.