Question to the Compiler FLAG "Os"

[halma]

hi ;-)

i have an question to the compiler flag "Os" 

gcc.gnu.org says the compiler flag "Os" is --->  "Optimize for size"

so my question is:
while i try to comile the xen-tools, so long i use the "Os" flag i run into compiler error ..  is the "Os" really needed and if i dont use it is it just the binary Size what is not optimized or  may arise, other disadvantages ?

thats the reason why i am asking:
http://lists.xenproject.org/archives/html/xen-users/2014-07/msg00303.html

thanks all
best regards
Halma

[Juanito]

The idea is that tc should be as small as possible, but if "-Os" doesn't work, you can either omit it or use "-O2".

[halma]

hi juanito

thanks for the reply .. ok let me try what -02 will produce ...

many thanks
best regards
Halma

[halma]

great juanito the "O2" compiler flag seems to be working ;-)

thank you very much
best regards
Halma