[CMake] variable inheritance

[Patrick Spendrin]

Hi,

I just found something new for me, and wondered if this qualifies as a bug:

argv-bug.cmake
function(testfunc1)
    message(STATUS "testfunc1: ${ARGV0} ${ARGV1} ${ARGV2}")
    testfunc2("${ARGV0}")
endfunction(testfunc1)

function(testfunc2)
    message(STATUS "testfunc2: ${ARGV0} ${ARGV1} ${ARGV2}")
endfunction(testfunc2)

testfunc1(para1 para2 para3)

# output:
# L:\>cmake -P C:\kde\kde-stable\tmp\cmake-argv-bug\argv-bug.cmake
# -- testfunc1: para1 para2 para3
# -- testfunc2: para1 para2 para3

It is clear why this happens: since ARGV1 and ARGV2 are not used, they
do not get overwritten and thus are available in testfunc2. Since ARGVx
are special variables though, I would think this is a bug?

(I tested 2.8.4, 2.8.7 and 2.8.8, and all versions show this behaviour.)

regards,
Patrick