ccconfig man page

ccconfig — Get Convert::Binary::C configuration for a compiler


ccconfig options [-- compiler-options]


  --cc             compiler   compiler executable to test
                              default: auto-determined
  --output-file    file       output filename
                              default: output to stdout

  --output-format  format     output format
                              default: dumper

  --basename       name       basename of the temporary test files
                              default: _t_e_s_t

  --inc-path       path       manually set compiler include path

  --preprocess     rule       compiler rule for preprocessing
  --compile-obj    rule       compiler rule for compiling objects
  --compile-exe    rule       compiler rule for compiling executables

  --c-ext          ext        extension of C source files
  --pp-ext         ext        extension of preprocessor output files
  --obj-ext        ext        extension of object files
  --exe-ext        ext        extension of executable files

  --nodelete                  don't delete temporary files
  --norun                     don't try to run executables
  --quiet                     don't display anything
  --nostatus                  don't display status indicator
  --version                   print version number
  --debug                     debug mode

Placeholders allowed in compiler rules:

  %c    C source file
  %o    object file
  %e    executable file
  %i    preprocessor output file
  |     result is written to stdout (only at end of rule)


"ccconfig" will try to determine a usable configuration for Convert::Binary::C from testing a compiler executable. It is not necessary that the binaries generated by the compiler can be executed, so "ccconfig" can also be used for cross-compilers.

This tool is still experimental, and you should neither rely on its output without checking, nor expect it to work in your environment.


“--cc” compiler

This option allows you to explicitly specify a compiler executable. This is especially useful if you don't want to use your system compiler. If this options is not given, "ccconfig" tries to guess a compiler.

“--output-file” file

Write Convert::Binary::C configuration to the specified file. The default is to write the configuration to "stdout".

“--output-format” format

Specify the output format of the Convert::Binary::C configuration. The following formats are currently supported:

  dumper      Output a %config hash using Data::Dumper
  require     Output in a format suitable for require

The default is "dumper".

“--basename” name

Allows you to change the base name of the temporary test files. This is used along with the various "-ext" options to build the filenames of C source files, preprocessor output files, object files and executables.

“--inc-path” path

This option allows you to manually set the include path of the compiler. This is useful if "ccconfig" cannot determine the include path automatically, most probably because it cannot parse the preprocessor output. This option can be specified more than once.

“--preprocess” rule

Using this option, you can specify a rule that "ccconfig" uses to run the compiler to get preprocessor output. Most compilers write the preprocessor output to standard output when given the "-E" option, i.e.

  cc -E foo.c

will preprocess foo.c to standard output. The corresponding rule for "ccconfig" would be:

  ccconfig --preprocess='-E %c |'

The <%c> will be replaced with the C source filename, and the pipe symbol signals that the result will be written to standard output.

The following placeholders can be used in "ccconfig" rules:

  %c    C source file
  %o    object file
  %e    executable file
  %i    preprocessor output file

Usually, "ccconfig" tries to figure out the correct rules on its own.

“--compile-obj” rule

Like "--preprocess", this option allows you to define a rule for how to compile an object file. For most compilers, this rule will be something like

  ccconfig --compile-obj='-c -o %o %c'

“--compile-exe” rule

Like "--preprocess", this option allows you to define a rule for how to compile an executable file. For most compilers, this rule will be something like

  ccconfig --compile-exe='-o %e %c'

Note that it is sufficient to specify either "--compile-obj" or "--compile-exe". So if your compiler can only create object files, that's just fine.


This option is used along with "--basename" to build the name of a C source file. This is usually set to ".c".


This option is used along with "--basename" to build the name of a preprocessor output file.


This option is used along with "--basename" to build the name of an object file.


This option is used along with "--basename" to build the name of an executable file.


Don't attempt to delete temporary files that have been created by the compiler. Normally, "ccconfig" will look for all files with the same basename as the temporary test file and delete them.


You can specify this option if the executables generated by your compiler cannot be run on your machine, i.e. if you have a cross-compiler. However, "ccconfig" will automatically find out that it cannot run the executables.

When this option is set, a different set of algorithms is used to determine a couple of configuration settings. These algorithms are all based upon placing a special signature in the object file. They are less reliable that the standard algorithms, so you shouldn't use them unless you have to.


Don't display anything except for the final configuration.


Hide the status indicator. Recommended if you want to redirect the script output to a file:

  ccconfig --nostatus > 2>ccconfig.log


Writes the program name, version and path to standard output.


Generate tons of debug output. Don't use unless you know what you're doing.


Normally, a simple


without arguments is enough if you want the configuration for your system compiler. While "ccconfig" is running, it will write lots of status information to "stderr". When it's done, it will usually dump a Perl hash table to "stdout" which can be directly used as a configuration for Convert::Binary::C.

If you want the configuration for a different compiler, or "ccconfig" cannot determine your system compiler automatically, use

  ccconfig -c gcc32

if your compiler's name is "gcc32".

If you want to pass additional options to the compiler, you can do so after a double-dash on the command line:

  ccconfig -- -g -DDEBUGGING


  ccconfig -c gcc32 -- -ansi -fshort-enums

If you'd like to interface with the Perl core, you may find a suitable configuration using something like:

  ccconfig --cc=`perl -MConfig -e 'print $Config{cc}'` \
           -- `perl -MConfig -e 'print $Config{ccflags}'`

See Also

See Convert::Binary::C.


2016-02-14 perl v5.24.1 User Contributed Perl Documentation