pcpp(1)

CC(1) General Commands Manual CC(1)

NAME

cc — front-end to the C compiler

SYNOPSIS

cc [-cEgkMPSstvX] [-ansi] [-Bprefix] [-D macro[

=value ]] [-dflags] [-ffeature] [-I path] [-include file] [-isystem path] [-Lpath] [-moption] [-nodefaultlibs] [-nostartfiles] [-nostdinc] [-nostdlib] [-O[
level ]] [-o outfile] [-pg] [-pthread] [-shared] [-static] [-std=standard] [-U macro] [-Wa,options] [-Wc,options] [-Wl,options] [-Wp,options] [-x language] [-z keyword] [file ...]

DESCRIPTION

The cc utility provides a front-end to the “portable C compiler”. Multiple files may be given on the command line. Unrecognized options are sent directly to ld(1).

Filenames that end with .c are passed via cpp(1) → ccom(1) → as(1) → ld(1).

Filenames that end with .i are passed via ccom(1) → as(1) → ld(1).

Filenames that end with .s are passed via as(1) → ld(1).

Filenames that end with .S are passed via cpp(1) → as(1) → ld(1).

Filenames that end with .o are passed directly to ld(1).

The options are as follows:

-ansi

Synonym for -std=c89.

-Bprefix

Define alternate prefix path for cpp(1), ccom(1), as(1), or ld(1) executables.

-C

Passed to the cpp(1) preprocessor to not discard comments.

-c

Stop after generating object code with as(1). Do not link. The resulting object output is saved as a filename with a “.o” suffix unless -o option is used. Note: cannot be combined with -o if multiple files are given.

-D macro[
=value]

Passed to the cpp(1) preprocessor to define macro with an optional value.

-dflags

Debug options. flags is a string of characters, which signify the following actions.

M

Cause the preprocessor to output a list of macro definitions.

any unknown flags are ignored.

-E

Stop after preprocessing with cpp(1). Do not compile, assemble, or link. Output is sent to standard output unless the -o option is used.

-ffreestanding

Assume a freestanding environment.

-fPIC

Generate PIC code.

-fpic

Tells C compiler to generate PIC code and tells assembler that PIC code has been generated.

-funsigned-char

Tell the compiler to treat ‘char’ types as if they were unsigned unless explicitly defined otherwise. -fsigned-char can be used to signify the opposite behaviour. The default for the ‘char’ type depends on the compiler target architecture.

-fstack-protector

Tell the compiler to wrap functions with code which checks at runtime that a stack overflow has not occurred. When stack protection is in effect, the __SSP__ macro will be defined.

-g

Send -g flag to ccom(1) to create debug output. Debug information output can be disabled with -g0.

-I path

Passed to the cpp(1) preprocessor to add header search directory to override system defaults.

-include file

Tells the cpp(1) preprocessor to include the file during preprocessing.

-isystem path

Defines path as a system header directory for the cpp(1) preprocessor.

-k

Generate PIC code. See -fpic option.

-Lpath

Passed to the linker, to add path to the list of directories searched for shared libraries.

-M

Pass -M flag to cpp(1) to generate dependencies for make(1).

-moption

Target-dependent options. Multiple -m options can be given, the following are supported:

ARM

-mlittle-endian -mbig-endian -mfpe=fpa -mfpe=vpf -msoft-float -march=armv1 -march=armv2 -march=armv2a -march=armv3 -march=armv4 -march=armv4t -march=armv4tej -march=armv5 -march=armv6 -march=armv6t2 -march=armv6kz -march=armv6k -march=armv7

HPPA

i386

MIPS

-mlittle-endian -mbig-endian -mhard-float -msoft-float

PDP-10

PowerPC

Sparc64

VAX

-nodefaultlibs

Do not link with the system default libraries (libc, etc.)

-nostartfiles

Do not link with the system startup files (crt0.c, etc.)

-nostdinc

Do not use the system include paths (/usr/include, etc.)

-nostdlib

Do not link with the system default libraries or startup files.

-O[
level]

Enable compiler optimizations. Currently, for levels higher than zero, this defines __OPTIMIZE__ in the cpp(1) preprocessor, and passes -xdce, -xdeljumps, -xtemps and -xinline to ccom(1). If no level is given the optimization level is -O1. Optimizations can be disabled using -O0. In situations where multiple optimization flags are given, the last flag is the one used.

-o outfile

Save result to outfile.

-P

Inhibit generation of line markers in preprocessor output. This is sometimes useful when running the preprocessor on something other than C code.

-pg

Enable profiling on the generated executable.

-pthread

Defines the _PTHREADS preprocessor identifier for cpp(1), and adds -lpthread to the ld(1) linker arguments.

-S

Stop after compilation by ccom(1). Do not assemble and do not link. The resulting assembler-language output is saved as a filename with a “.s” suffix unless the -o option is used. Note: cannot be combined with -o if multiple files are given.

-s

Passed to ld(1) to remove all symbol table and relocation information from the generated executable. This option is silently ignored if cc does not invoke the linker.

-shared

Create a shared object of the result. Tells the linker not to generate an executable.

-static

Do not use dynamic linkage. By default, it will link using the dynamic linker options and/or shared objects for the platform.

-std=standard

Compile to the specified standard. Accepted values for standard are c89, c99, gnu89, gnu99, gnu9x, and c11.

-t

Passed to cpp(1) to suppress some default macro definitions and enable use of traditional C preprocessor syntax.

-U macro

Passes to the cpp(1) preprocessor to remove the initial macro definition.

-v

Outputs the version of cc and shows commands as they are run with their command line arguments.

-###

As per -v except that the commands are not run, and the arguments will be quoted if they contain unusual characters or spaces.

-Wa,options

Comma separated list of options for the assembler.

-Wc,options

Comma separated list of options for the compiler.

-Wl,options

Comma separated list of options for the linker.

-Wp,options

Comma separated list of options for the preprocessor.

-X

Don’t remove temporary files on exit.

-x language

GCC compatibility option; specify the language in use rather than interpreting the filename extension. Currently known language values are none, c, c++, assembler and assembler-with-cpp. Any unknown -x options are passed to ccom(1).

-z keyword

Passed to ld(1). Please refer to the documentation of your linker for acceptable values of keyword.

Predefined Macros

A few macros are predefined by cc when sent to cpp(1).

__PCC__  Set to the major version of pcc(1). These macros can be used to select code based on pcc(1) compatibility. See the -v option.

__PCC_MINOR__  Set to the minor version.

__PCC_MINORMINOR__  Set to the minor-minor version — the number after the minor version.

_PTHREADS  Defined when -pthread switch is used.

__ASSEMBLER__  Defined when input files have a .S suffix, or if the -xassembler-with-cpp option is specified.

Also system- and/or machine-dependent macros may also be predefined; for example: __NetBSD__, __ELF__, and __i386__.

SEE ALSO

as(1), ccom(1), cpp(1), ld(1)

HISTORY

The cc command comes from the original Portable C Compiler by S. C. Johnson, written in the late 70’s.

This product includes software developed or owned by Caldera International, Inc. GNU June 20, 2014 CC(1)