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Re: -ffreestanding option of GCC

From: Andi Hellmund <mail at andihellmund dot com>
To: ali hagigat <hagigatali at gmail dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Tue, 04 Jan 2011 09:53:02 +0100
Subject: Re: -ffreestanding option of GCC
References: <AANLkTi=TwCt03zpW8jaJ2=iVSgvy-ecS20Uc3ApyLAB+@mail.gmail.com>

On 01/04/2011 06:11 AM, ali hagigat wrote:

What is the effect of -ffreestanding option? Is it like -fno-builtin exactly?

Hey Ali,

here's a quote from the man page:

"Assert that compilation takes place in a freestanding environment. This implies -fno-builtin. A freestanding environment is one in which the standard library may not exist, and program startup may not necessarily be at "main". The most obvious example is an OS kernel. This is equivalent to -fno-hosted."

From the code-level, the -ffreestanding option just sets -fno-hosted and the -fno-bulitin option.

Andi

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