[cmake-developers] [CMake 0015854]: Extreme memory usage by CMake 3.4

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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https://cmake.org/Bug/view.php?id=15854 
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Reported By:                Brad King
Assigned To:                Stephen Kelly
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Project:                    CMake
Issue ID:                   15854
Category:                   CMake
Reproducibility:            always
Severity:                   major
Priority:                   high
Status:                     assigned
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Date Submitted:             2015-11-19 14:16 EST
Last Modified:              2015-11-19 14:16 EST
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Summary:                    Extreme memory usage by CMake 3.4
Description: 
Since commit

 cmDefinitions: Implement in terms of cmLinkedTree.
 https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=25e04ddf

CMake uses a huge amount of memory to perform a task previously accomplished in
a moderate amount of memory.


Steps to Reproduce: 
$ cat example.cmake
function(concat v l r)
  set(${v} "${l};${r}" PARENT_SCOPE)
endfunction()

set(o "")
foreach(n RANGE 1 32768)
  concat(o "${o}" "a")
endforeach()

$ cmake -P example.cmake

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Issue History 
Date Modified    Username       Field                    Change               
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2015-11-19 14:16 Brad King      New Issue                                    
2015-11-19 14:16 Brad King      Status                   new => assigned     
2015-11-19 14:16 Brad King      Assigned To               => Stephen Kelly   
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