QCC, qcc

Compile command (QNX)


For C:

qcc [options] [operands]

For C++:

QCC [options] [operands]

Runs on:

Linux, Microsoft Windows


-A library[.a]
Build a new archive.
-a library[.a]
Add to the given archive.
Compile strict ANSI code.
Link dynamically against any subsequent libraries on the command line.
Link statically against any subsequent libraries on the command line.
Preprocessor leaves comments.
Compile only.
-D name[=value]
Define the symbol name, optionally setting its value.
Preprocess to stdout.
-EB or -EL
Compile for big or little endian.
Compile with debug.
-I path[:path ...]
Set the search path for #include directives.
-L path[:path ...]
Set the library search path.
Note: The development tools have been designed to work out of their processor directories (x86, etc.). This means you can use the same tool set for any target platform.

If you have development libraries for a certain platform, put them into the platform-specific library directory (e.g., /x86/lib), which is where the compiler tools look by default. Don't put the libraries in /lib or /usr/lib, which are ignored. Alternatively, use the -L option to specify the libraries' location.

-l library
("el") Add library to the list of libraries to link against. Omit the lib prefix and any extension from the library's name. For example, to link against libsocket, specify -l socket.

You can specify more than one -l option. The qcc configuration files might specify some libraries for you; for example, qcc usually links against libc.

Note: The application binary interfaces (ABIs) for the Dinkum C++ and GNU C++ libraries are incompatible. If you link a program against both libraries, you'll get a segmentation fault.
Treat as C (the default for qcc).
Treat as C++ (the default for QCC).
Note: You need to link C++ programs with the -lang-c++ option in order for exceptions to work.
Generate a mapfile called output_file.map.
-N stacksize[K]
Specify the stack size, in bytes or kilobytes.
Don't execute.
Use temporary files rather than pipes between phases.
Don't use ld_startup_* sections.
Don't include the standard C include paths.
Don't include the standard C++ include paths.
Don't use the ld_startup_* or ld_stdlib sections.
Don't use the ld_stdlib++ section.
Do compile-phase optimization.
-o outfile
Specify the name of the output file. The default is a.out.
Note: Note that the make utility, when used with the default settings, produces an output file with the same name as the input file. For example:
make file1

results in the executable output file file1.

Preprocess to file.i (C) or file.ii (C++).
Compile with profiling; see "Profiling," below.
Compile, leave assembly in file.s.
Save intermediate files created during compilation.
Set the current -V argument as the default target. For example:
qcc -V4.7.1,gcc_ntoarmv7le -set-default

will set GCC 4.7.1 for ARMv7 little-endian as the default.

Note: You must be root to use the -set-default option. Note also that the option is intended for use at the command line, not for makefiles.
When compiling, make the object position-independent so that it's suitable for inclusion in a shared object. When linking, combine the modules into a shared object.
Link against static libraries only.
Specify the language standard. For more information, see http://gcc.gnu.org/onlinedocs/gcc-4.7.3/gcc/C-Dialect-Options.html in the GNU documentation.
-U name
Undefine the given symbol.
-V [[compiler/]version,][target]
The compiler name, version number, and the target name. If you don't specify -V at all, qcc uses the default compiler, version, and target.

If you specify the target, qcc looks for the target configuration files in the following paths, according to how compiler, version, and target are specified:

If you specify: qcc looks here:
-Vtarget ${QCC_CONF_PATH}/compiler/version (where compiler is inferred from target, and version is the default).
-Vversion,target ${QCC_CONF_PATH}/compiler/version (where compiler is inferred from target; if that path doesn't exist, or if version contains a slash [/], then ${QCC_CONF_PATH}/version is used).
-Vcompiler,target ${QCC_CONF_PATH}/compiler/version (where version is the specified compiler's default version).
-Vcompiler/version,target ${QCC_CONF_PATH}/compiler/version

For example, this command:

qcc -Vgcc,

lists all targets in all versions of gcc. See the Examples section below for more examples.

The targets include:

  • gcc_ntoarmv7le
  • gcc_ntox86

For a list of supported targets, specify -V (or -Vcompiler or -Vcompiler/version or -Vversion, provided there's a valid ${QCC_CONF_PATH}/version directory).

Operate verbosely (the second v turns on verbosity in the compiler).
-W phase,arg[,arg ...]
Pass the specified option and its arguments through to a specific phase:
  • p — preprocessor
  • c — compiler
  • l — linker
  • a — assembler

For example, if you want to pass the -MD option to the compiler, specify -Wc,-MD on the command line for qcc.

Suppress all warnings (same as -w0).
Note: If you specify -w along with multiple warning options, all warnings are suppressed regardless of the order of the options. In other words, -w always wins.
Set the warning level (0=off). The -w9 option is the same as gcc's -W9 option. To generate warnings for everything, include these options with -w9:
  • -Wcast-qual
  • -Wpointer-arith
  • -Wshadow
  • -Wwrite-strings

Note that using these options will produce warnings in the standard C++ library headers, and possibly other system headers.

-x extension
Treat the files that follow as being of type extension. The following values of extension are accepted:
  • c
  • c-header
  • c++
  • c++-header
  • cpp-output
  • assembler
  • assembler-with-cpp

as well as valid file extensions, such as .c, .cc, .cpp, .C, .i, .ii, .s, and .S.

Use -xnone to go back to normal suffix typing. For example, to compile myfile.h as if it were a .c file:

qcc -xc myfile.h
-Y lib_type
Select the C++ library type to be used (if available), lib_type can be:
  • _gpp — GNU C++ library
  • _cpp — Dinkum C++ library (default)
  • _cpp-ne — Dinkum C++ library (no exceptions)
Note: Even with exceptions disabled, the new() operator throws a std::out_of_memory exception if there isn't enough memory. If you want new() to return NULL instead of throwing an exception, you can provide a custom new handler via std::set_new_handler() to do so, or use std::nothrow.


QCC and qcc are the QNX compiler interface. They're based on the POSIX c89 utility. By default, QCC considers a program to be C++, while qcc considers it to be C.

QCC and qcc take a list of source and object modules on the command line and invoke the appropriate parser to compile each file. Object modules are passed straight through to the linker. The file suffix determines which parser is used, as follows:

Suffix File type Parser
.s Assembly language Assembler
.S Assembly language with preprocessor directives Assembler
.c C or C++ code C or C++ compiler, depending on whether you invoke qcc or QCC
.i Preprocessed C or C++ code C or C++ compiler, depending on whether you invoke qcc or QCC
.C, .cc, .cpp C or C++ code C or C++ compiler, depending on whether you invoke qcc or QCC
.H, .HPP, .h++, .h, .hh, .hpp, .hxx Precompiled header C or C++ compiler, depending on whether you invoke qcc or QCC
.ii Preprocessed C++ code C or C++ compiler, depending on whether you invoke qcc or QCC
.o Object file Linker
.a Library file Linker

These utilities don't allow multiple options to be specified after a dash character (-). For example, -gc isn't valid; you must specify -g -c instead. Operands (source and object files) and options may be mixed and specified in any order. Some options, such as -I and -L, are order-dependent—the order in which they appear in the command line determines the order of the searches made. All command-line arguments are processed before any compilation or linking begins.

Note: The single-pass linker resolves symbols from left to right: If a module refers to a symbol that is contained in a library, make sure you specify the library to the right of the module.

When qcc encounters a compilation error that stops an object file from being created, it writes a diagnostic to the standard error and continues to compile other source files, but it bypasses the link phase and returns a nonzero exit status. If the link phase is entered and is unsuccessful, a diagnostic is written and qcc exits with a nonzero status.

The -c option suppresses the link phase. If you have many separate source files that you must update and modify individually, you'll probably use the -c option frequently.

You may occasionally wish to examine the assembly code produced by the code generator. The -S option produces an assembly file ending in .s.

If you need to specify a parameter to any of the language processors, you may use the -W c,option. Check the documentation on each processor to determine its options.

The compiler defines various preprocessor symbols (or manifest constants) that can help you make decisions at compile time. For more information, see the Manifests chapter of the QNX Neutrino C Library Reference.


Here's how to profile your application, so you can see where it's spending its time:

  1. Compile and link your application with profiling by using the -p option to qcc. For example:
    make CCOPTS+=-p LDOPTS+=-p
  2. Slay qconn, or it will redirect the output.
  3. Run your application as root (this is important because the timers are privileged). The result of this run is a file called gmon.out, in your program's current working directory when it exits.
  4. Look at the profiled output with the command:
    gprof [your_app] | less

For more information, see the GNU documentation for gprof, and Profiling an Application in the IDE User's Guide.


Compile myfile.c and create a 32-bit executable program for QNX Neutrino for an Intel x86 machine in the current directory with the name a.out:

qcc -Vgcc_ntox86 myfile.c

Compile myfile.c and create a 32-bit executable program for QNX Neutrino for an Intel x86 machine in the current directory with the name myfile:

qcc -Vgcc_ntox86 -o myfile myfile.c

Use the default compiler, version, and target:

qcc -o myfile myfile.c
Note: You can use qcc -V to determine the defaults.

Use the default version of the compiler, and build for an ARM little-endian target:

qcc -Vgcc_ntoarmv7le -o myfile myfile.c

Use the 4.7.1 version of the compiler, and build for an ARMv7 little-endian target:

qcc -V4.7.1,gcc_ntoarmv7le -o myfile myfile.c

Use make to compile myfile.c and create an executable program in the current directory with the name myfile:

make myfile
Note: You can't use the default rules for make — you need to specify the target. See make.

Make a shared library:

qcc -Vgcc_ntox86 -shared -c shared.c
qcc -Vgcc_ntox86 -shared -o libshared.so shared.o


The default output file. You can use the -o option to override this.
Configuration files:
${QCC_CONF_PATH}/version/*.conf, ${QCC_CONF_PATH}/default, ${QCC_CONF_PATH}/gcc/default, ${QCC_CONF_PATH}/gcc/version/default

Environment variables:

The name of the directory that contains the configuration files. The default directory is ${QNX_HOST}/etc/qcc.

Exit status:

An error occurred.