[CMake] performance of SET() vs. LIST(SET ...) ... and one feature request

[Alexander Neundorf]

Hi, 
 
for testing the performance of appending items to a list via SET(var 
${var} item) vs. LIST(SET var item) I wrote two ruby scripts which 
generate CMakeLists.txt which do nothing else than this. 
They do: 
-generate 100 variables 
-call set(var ${var} newItem) and respectively list(set var newItem) 1000 
times for each  
 
Results on a AMD XP 2000+: 
using set: 2 min 48 s 
using list(set ...): 9 s 
 
I.e. using list(SET ...) is much faster for appending items to a list 
than using SET(). 
The two scripts for generating the CMakeLists.txt are attached. 
 
(But unfortunately that's not the bottleneck for kdebase) 
 
One here comes the feature request: 
 
set(foo) 
list(SET foo "firstItem") 
 
fails: 
 
~/src/tests/cmakespeed$ cmake . 
CMake Error: Error in cmake code at 
/home/alex/src/tests/cmakespeed/CMakeLists.txt:2: 
LIST cannot find variable: foo 
-- Configuring done 
 
 
It would be nice if this would work, otherwise one again has to use 
 
if (var) 
   list(SET ...) 
else 
   set(var ...) 
endif 
 
 
everywhere. 
 
Bye 
Alex 
 

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