What is -o2 in compiler flags?

[edgy shadow]

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[wooden socket]

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[tough marsh]

https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#Optimize-Options

in most cases you'll see the difference in binary size and speed (unnoticeable if there are small number of code that can be optimized).

[tribal bay]

-o2 sets the output file name to "2", -O2 sets the optimization level to 2

[sharp thicket]

Would -o2 even work?
I would've thought it'd complain about an invalid option.

[tribal bay]

why would it not work?

[sharp thicket]

Don't you need a space like this?

gcc main.c -o main
```instead of 

gcc main.c -omain

[tribal bay]

no

that applies to most single letter option in most programs

[sharp thicket]

Interesting

[tribal bay]

e.g. cut -d. -f1

[edgy shadow]

i am interested in this optimization level. how many levels are there and how they differ. any link?

[tribal bay]

https://gcc.gnu.org/onlinedocs/gcc.pdf

[sharp thicket]

#1066006208030462054 message

[magic crag]

You can consult the documentation provided. The information you seek lie within

[wooden socket]

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