Struct Predef 

pub struct Predef {
    pub std: Std,
    pub gnu_extensions: bool,
    pub gnu89_inline: bool,
    pub gnuc: GnucVersion,
    pub opt_level: OptLevel,
    pub hosted: bool,
    pub pic: Pic,
    pub timestamp: Timestamp,
    pub glibc_minor: Option<u32>,
    pub defines: Vec<String>,
    pub undefines: Vec<String>,
}

Everything the predefined set is built from that is not the target.

Fields

std: Std

The dialect, which decides __STDC_VERSION__.

gnu_extensions: bool

Whether the GNU extensions are on, which is -std=gnu23 rather than -std=c23. It decides __STRICT_ANSI__ and the unarmoured linux and unix macros.

gnu89_inline: bool

Whether the unit is under GNU’s reading of inline, which is -fgnu89-inline. It decides which of __GNUC_GNU_INLINE__ and __GNUC_STDC_INLINE__ is defined, and the C89 dialects are under that reading whatever it says.

gnuc: GnucVersion

The GCC release claimed.

opt_level: OptLevel

Decides __OPTIMIZE__, __OPTIMIZE_SIZE__ and __NO_INLINE__.

hosted: bool

Whether there is a standard library, which is -ffreestanding turned around.

pic: Pic

Which link the output is for, from -fPIC and -fPIE. It decides __PIE__, since __PIC__ is defined either way and says only that there are no absolute addresses.

timestamp: Timestamp

__DATE__ and __TIME__.

glibc_minor: Option<u32>

The glibc release the headers are, as the minor number alone, when they are ours.

__GLIBC_MINOR__ and nothing else: __GLIBC__ is 2 in the tree itself, which is how Zig’s own patched features.h has it, and a version the compiler supplied and a version the header supplied would be two answers to one question.

defines: Vec<String>

-D in command line order. FOO means FOO=1, as GCC has it.

undefines: Vec<String>

-U in command line order, applied after the defines.

Implementations

impl Predef

pub fn new() -> Predef

The default dialect, gnu23, at -O0.

impl Predef

pub fn for_options(opts: &Options) -> Predef

The set the command line asked for.

The mapping lives here rather than in the driver because it is the definition of what each flag means to the macro set, and the driver’s job is to parse a command line, not to know that -ffreestanding is __STDC_HOSTED__ being zero.

Trait Implementations

impl Clone for Predef

fn clone(&self) -> Predef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Predef

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

Formats the value using the given formatter.

impl Default for Predef

fn default() -> Predef

Returns the “default value” for a type.

impl Eq for Predef

impl PartialEq for Predef

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Predef