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)