What is ffreestanding in gcc ? What is it used for ? I came across the following :
gcc -ffreestanding -m32 -c kernel.c -o kernel.o
and do not understand, what does it mean exactly.
What is -ffreestanding option in gcc?
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A
freestandingenvironment is one in which the standard library may not exist, and program startup may not necessarily be at "main". The option-ffreestandingdirects the compiler to not assume that standard functions have their usual definition.By default, GCC will act as the compiler for a hosted implementation, defining
__STDC_HOSTED__as 1 and presuming that when the names of ISO C functions are used, they have the semantics defined in the standard. To make it act as a conforming freestanding implementation for a freestanding environment, use the option-ffreestanding. It will then define__STDC_HOSTED__to 0, and not make assumptions about the meanings of function names from the standard library.For more Info, This link may help.