Enum Pic 

pub enum Pic {
    Executable,
    Library,
}

Which of the two position independent questions the output is answering.

Everything this compiler writes is position independent, so this is not about whether there are absolute addresses in the text. It is about whether the link that reads the object is one that puts every name in the same program. An executable is such a link and a shared library is not, and the difference decides how a name is reached: from the instruction pointer where the distance is a number the linker has, and out of the global offset table where it is not.

The expensive answer is the one that has to be asked for, which is gcc’s arrangement and is why -fPIC is on the compile line of every library and nowhere else. A name is only reached the expensive way when it is one another object may define or replace, so -fPIC -fvisibility=hidden costs no more than an executable does.

Variants

Executable

-fPIE, -fpie and nothing at all. The link puts every name in one program, so a name this file defines is at a distance from the instruction asking, and a name it declares ends up at one too, because the linker answers a reference to a variable defined in a library by making room for it here and copying it. That is what a distribution’s default build is.

Library

-fPIC and -fpic. The output may end up in a shared library, where a name the file exports is one something loaded earlier may define too, and where a name defined elsewhere is not copied in. Both are reached through the global offset table.

Implementations

impl Pic

pub const fn as_str(self) -> &'static str

The spelling this is asked for by, which is the one gcc’s manual leads with.

Trait Implementations

impl Clone for Pic

fn clone(&self) -> Pic

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Pic

impl Debug for Pic

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Pic

fn default() -> Pic

Returns the “default value” for a type.

impl Display for Pic

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Pic

impl Hash for Pic

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Pic

fn cmp(&self, other: &Pic) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Pic

fn eq(&self, other: &Pic) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for Pic

fn partial_cmp(&self, other: &Pic) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Pic