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# ExtUtils::MM_Unix

- NAME
- SYNOPSIS
- DESCRIPTION
- METHODS
  - Preloaded methods
  - SelfLoaded methods
  - Methods to actually produce chunks of text for the Makefile
- SEE ALSO

## NAME

ExtUtils::MM_Unix - methods used by ExtUtils::MakeMaker

## SYNOPSIS

`require ExtUtils::MM_Unix;`

## DESCRIPTION

The methods provided by this package are designed to be used in conjunction with ExtUtils::MakeMaker. When MakeMaker writes a Makefile, it creates one or more objects that inherit their methods from a package `MM`. MM itself doesn't provide any methods, but it ISA ExtUtils::MM_Unix class. The inheritance tree of MM lets operating specific packages take the responsibility for all the methods provided by MM_Unix. We are trying to reduce the number of the necessary overrides by defining rather primitive operations within ExtUtils::MM_Unix.

If you are going to write a platform specific MM package, please try to limit the necessary overrides to primitive methods, and if it is not possible to do so, let's work out how to achieve that gain.

If you are overriding any of these methods in your Makefile.PL (in the MY class), please report that to the makemaker mailing list. We are trying to minimize the necessary method overrides and switch to data driven Makefile.PLs wherever possible. In the long run less methods will be overridable via the MY class.

## METHODS

The following description of methods is still under development. Please refer to the code for not suitably documented sections and complain loudly to the makemaker mailing list.

Not all of the methods below are overridable in a Makefile.PL. Overridable methods are marked as (o). All methods are overridable by a platform specific MM_*.pm file (See the ExtUtils::MM_VMS manpage) and the ExtUtils::MM_OS2 manpage).

### Preloaded methods

canonpath
  No physical check on the filesystem, but a logical cleanup of a path. On UNIX eliminated successive slashes and successive "/.".
catdir
  Concatenate two or more directory names to form a complete path ending with a directory. But remove the trailing slash from the resulting string, because it doesn't look good, isn't necessary and confuses OS2. Of course, if this is the root directory, don't cut off the trailing slash :-)
catfile
  Concatenate one or more directory names and a filename to form a complete path ending with a filename
curdir
  Returns a string representing of the current directory. "." on UNIX.
rootdir
  Returns a string representing of the root directory. "/" on UNIX.
updir
  Returns a string representing of the parent directory. ".." on UNIX.

### SelfLoaded methods

c_o (o)
  Defines the suffix rules to compile different flavors of C files to object files.
cflags (o)
  Does very much the same as the cflags script in the perl distribution. It doesn't return the whole compiler command line, but initializes all of its parts. The const_cccmd method then actually returns the definition of the CCCMD macro which uses these parts.
clean (o)
  Defines the clean target.
const_cccmd (o)
  Returns the full compiler call for C programs and stores the definition in CONST_CCCMD.
const_config (o)
  Defines a couple of constants in the Makefile that are imported from %Config.
const_loadlibs (o)
  Defines EXTRALIBS, LDLOADLIBS, BSLOADLIBS, LD_RUN_PATH. See the ExtUtils::Liblist manpage for details.
constants (o)
  Initializes lots of constants and .SUFFIXES and .PHONY
depend (o)
  Same as macro for the depend attribute.
dir_target (o)
  Takes an array of directories that need to exist and returns a Makefile entry for a .exists file in these directories. Returns nothing, if the entry has already been processed. We're helpless though, if the same directory comes as $(FOO) _and_ as "bar". Both of them get an entry, that's why we use "::".
dist (o)
  Defines a lot of macros for distribution support.
dist_basics (o)
  Defines the targets distclean, distcheck, skipcheck, manifest, veryclean.
dist_ci (o)
  Defines a check in target for RCS.
dist_core (o)
  Defines the targets dist, tardist, zipdist, uutardist, shdist
dist_dir (o)
  Defines the scratch directory target that will hold the distribution before tar-ing (or shar-ing).
dist_test (o)
  Defines a target that produces the distribution in the scratchdirectory, and runs 'perl Makefile.PL; make ;make test' in that subdirectory.
dlsyms (o)
  Used by AIX and VMS to define DL_FUNCS and DL_VARS and write the *.exp files.
dynamic (o)
  Defines the dynamic target.
dynamic_bs (o)
  Defines targets for bootstrap files.
dynamic_lib (o)
  Defines how to produce the *.so (or equivalent) files.
exescan
  Deprecated method. Use libscan instead.
extliblist
  Called by init_others, and calls ext ExtUtils::Liblist. See the ExtUtils::Liblist manpage for details.
file_name_is_absolute
  Takes as argument a path and returns true, if it is an absolute path.
find_perl
  Finds the executables PERL and FULLPERL

### Methods to actually produce chunks of text for the Makefile

The methods here are called for each MakeMaker object in the order specified by @ExtUtils::MakeMaker::MM_Sections.

fixin
  Inserts the sharpbang or equivalent magic number to a script
force (o)
  Just writes FORCE:
guess_name
  Guess the name of this package by examining the working directory's name. MakeMaker calls this only if the developer has not supplied a NAME attribute.
has_link_code
  Returns true if C, XS, MYEXTLIB or similar objects exist within this object that need a compiler. Does not descend into subdirectories as needs_linking() does.
htmlifypods (o)
  Defines targets and routines to translate the pods into HTML manpages and put them into the INST_HTMLLIBDIR and INST_HTMLSCRIPTDIR directories.
init_dirscan
  Initializes DIR, XS, PM, C, O_FILES, H, PL_FILES, HTML*PODS, MAN*PODS, EXE_FILES.
init_main
  Initializes NAME, FULLEXT, BASEEXT, PARENT_NAME, DLBASE, PERL_SRC, PERL_LIB, PERL_ARCHLIB, PERL_INC, INSTALLDIRS, INST_*, INSTALL*, PREFIX, CONFIG, AR, AR_STATIC_ARGS, LD, OBJ_EXT, LIB_EXT, EXE_EXT, MAP_TARGET, LIBPERL_A, VERSION_FROM, VERSION, DISTNAME, VERSION_SYM.
init_others
  Initializes EXTRALIBS, BSLOADLIBS, LDLOADLIBS, LIBS, LD_RUN_PATH, OBJECT, BOOTDEP, PERLMAINCC, LDFROM, LINKTYPE, NOOP, FIRST_MAKEFILE, MAKEFILE, NOECHO, RM_F, RM_RF, TEST_F, TOUCH, CP, MV, CHMOD, UMASK_NULL
install (o)
  Defines the install target.
installbin (o)
  Defines targets to make and to install EXE_FILES.
libscan (o)
  Takes a path to a file that is found by init_dirscan and returns false if we don't want to include this file in the library. Mainly used to exclude RCS, CVS, and SCCS directories from installation.
linkext (o)
  Defines the linkext target which in turn defines the LINKTYPE.
lsdir
  Takes as arguments a directory name and a regular expression. Returns all entries in the directory that match the regular expression.
macro (o)
  Simple subroutine to insert the macros defined by the macro attribute into the Makefile.
makeaperl (o)
  Called by staticmake. Defines how to write the Makefile to produce a static new perl.

  By default the Makefile produced includes all the static extensions in the perl library. (Purified versions of library files, e.g., DynaLoader_pure_p1_c0_032.a are automatically ignored to avoid link errors.)

makefile (o)
  Defines how to rewrite the Makefile.
manifypods (o)
  Defines targets and routines to translate the pods into manpages and put them into the INST_* directories.
maybe_command
  Returns true, if the argument is likely to be a command.
maybe_command_in_dirs
  method under development. Not yet used. Ask Ilya :-)
needs_linking (o)
  Does this module need linking? Looks into subdirectory objects (see also has_link_code())
nicetext
  misnamed method (will have to be changed). The MM_Unix method just returns the argument without further processing.

  On VMS used to insure that colons marking targets are preceded by space - most Unix Makes don't need this, but it's necessary under VMS to distinguish the target delimiter from a colon appearing as part of a filespec.

parse_version
  parse a file and return what you think is $VERSION in this file set to. It will return the string "undef" if it can't figure out what $VERSION is.
parse_abstract
  parse a file and return what you think is the ABSTRACT
pasthru (o)
  Defines the string that is passed to recursive make calls in subdirectories.
path
  Takes no argument, returns the environment variable PATH as an array.
perl_script
  Takes one argument, a file name, and returns the file name, if the argument is likely to be a perl script. On MM_Unix this is true for any ordinary, readable file.
perldepend (o)
  Defines the dependency from all *.h files that come with the perl distribution.
ppd
  Defines target that creates a PPD (Perl Package Description) file for a binary distribution.
perm_rw (o)
  Returns the attribute `PERM_RW` or the string `644`. Used as the string that is passed to the `chmod` command to set the permissions for read/writeable files. MakeMaker chooses `644` because it has turned out in the past that relying on the umask provokes hard-to-track bug reports. When the return value is used by the perl function `chmod`, it is interpreted as an octal value.
perm_rwx (o)
  Returns the attribute `PERM_RWX` or the string `755`, i.e. the string that is passed to the `chmod` command to set the permissions for executable files. See also perl_rw.
pm_to_blib
  Defines target that copies all files in the hash PM to their destination and autosplits them. See the DESCRIPTION entry in the ExtUtils::Install manpage
post_constants (o)
  Returns an empty string per default. Dedicated to overrides from within Makefile.PL after all constants have been defined.
post_initialize (o)
  Returns an empty string per default. Used in Makefile.PLs to add some chunk of text to the Makefile after the object is initialized.
postamble (o)
  Returns an empty string. Can be used in Makefile.PLs to write some text to the Makefile at the end.
prefixify
  Check a path variable in $self from %Config, if it contains a prefix, and replace it with another one.

  Takes as arguments an attribute name, a search prefix and a replacement prefix. Changes the attribute in the object.

processPL (o)
  Defines targets to run *.PL files.
realclean (o)
  Defines the realclean target.
replace_manpage_separator
  Takes the name of a package, which may be a nested package, in the form Foo/Bar and replaces the slash with `::`. Returns the replacement.
static (o)
  Defines the static target.
static_lib (o)
  Defines how to produce the *.a (or equivalent) files.
staticmake (o)
  Calls makeaperl.
subdir_x (o)
  Helper subroutine for subdirs
subdirs (o)
  Defines targets to process subdirectories.
test (o)
  Defines the test targets.
test_via_harness (o)
  Helper method to write the test targets
test_via_script (o)
  Other helper method for test.
tool_autosplit (o)
  Defines a simple perl call that runs autosplit. May be deprecated by pm_to_blib soon.
tools_other (o)
  Defines SHELL, LD, TOUCH, CP, MV, RM_F, RM_RF, CHMOD, UMASK_NULL in the Makefile. Also defines the perl programs MKPATH, WARN_IF_OLD_PACKLIST, MOD_INSTALL. DOC_INSTALL, and UNINSTALL.
tool_xsubpp (o)
  Determines typemaps, xsubpp version, prototype behaviour.
top_targets (o)
  Defines the targets all, subdirs, config, and O_FILES
writedoc
  Obsolete, deprecated method. Not used since Version 5.21.
xs_c (o)
  Defines the suffix rules to compile XS files to C.
xs_cpp (o)
  Defines the suffix rules to compile XS files to C++.
xs_o (o)
  Defines suffix rules to go from XS to object files directly. This is only intended for broken make implementations.
perl_archive
  This is internal method that returns path to libperl.a equivalent to be linked to dynamic extensions. UNIX does not have one but OS2 and Win32 do.
perl_archive_after
  This is an internal method that returns path to a library which should be put on the linker command line after the external libraries to be linked to dynamic extensions. This may be needed if the linker is one-pass, and Perl includes some overrides for C RTL functions, such as malloc().
export_list
  This is internal method that returns name of a file that is passed to linker to define symbols to be exported. UNIX does not have one but OS2 and Win32 do.

## SEE ALSO

the ExtUtils::MakeMaker manpage

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