Compacting CMake unit test macros into one macro using conditional statement - foreach

Question

I want to reduce the CMake macro calls in my code below and compact it into one CMake macro call to execute my operation using an if-else statement.
I need to run ctest (using CMake) by passing different height and width parameters.
Please consider this as some arithmetic operations.
In my case, depending on width, my height ranges will change like this:
Width = 8 ,then height will be 8 16 24
Width = 16 ,then height will be 16 24
Width = 24 ,then height will be 24 32
So, is it possible to use some if-else statement in the CMake file to make a single call to EXECUTE_OPERATION(${width_val} ${height_val} )?
My current CMake file looks like this:
set(width 8)
set(size 8 16 24 )
foreach(size_val ${size}
foreach(width_val ${width})
EXECUTE_OPEARTION(${width_val} ${height_val} )
endforeach(width_val)
endforeach(size_val)
---------------------------
set(width 16)
set(height 16 24 )
foreach(height_val ${height}
foreach(width_val ${width})
EXECUTE_OPEARTION(${width_val} ${height_val} )
endforeach(width_val)
endforeach(size_val)
---------------------------
set(width 24)
set(size 24 32 )
foreach(size_val ${size}
foreach(width_val ${width})
EXECUTE_OPEARTION(${width_val} ${height_val} )
endforeach(width_val)
endforeach(size_val)
---------------------------
I tried to do this using the following, but it did not work:
set(width 8 16 24 )
if(width == 8)
set(height 8 16 24 )
elif(width == 16)
set(height 16 24 )
elif(width == 24)
set(height 24 32)
foreach(height_val ${height}
foreach(width_val ${width})
EXECUTE_OPEARTION(${width_val} ${height_val} )
endforeach(width_val)
endforeach(size_val)

Answer 1

Your if-statement seems to have Python syntax. You should use elseif instead of elif. Also, the CMake if-statement syntax to test for equality is EQUAL, not ==.
In addition, you need to move the if-statement block within the foreach() block in order for this to work. Try something like this:
# Define the width values to iterate through.
set(width 8 16 24)
# Iterate through each width value.
foreach(width_val ${width})
# Set the height values, based on the current width value.
if(${width_val} EQUAL 8)
set(height 8 16 24)
elseif(${width_val} EQUAL 16)
set(height 16 24)
elseif(${width_val} EQUAL 24)
set(height 24 32)
endif()
# Loop through each height value.
foreach(height_val ${height})
message("Calling EXECUTE_OPEARTION() with args: Width: ${width_val}, Height: ${height_val}")
EXECUTE_OPEARTION(${width_val} ${height_val})
endforeach(height_val)
endforeach(width_val)
This prints the following, verifying the function is called with the correct arguments:
Calling EXECUTE_OPEARTION() with args: Width: 8, Height: 8
Calling EXECUTE_OPEARTION() with args: Width: 8, Height: 16
Calling EXECUTE_OPEARTION() with args: Width: 8, Height: 24
Calling EXECUTE_OPEARTION() with args: Width: 16, Height: 16
Calling EXECUTE_OPEARTION() with args: Width: 16, Height: 24
Calling EXECUTE_OPEARTION() with args: Width: 24, Height: 24
Calling EXECUTE_OPEARTION() with args: Width: 24, Height: 32