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MAKEPPINFO(1)			    Makepp			 MAKEPPINFO(1)

       makeppinfo -- What makepp knows about files

       ?: -?,  A: -A,
	 --arguments-file,  D: -d,
	 --decode-dates,  F: -f,
	 --force,  H: -h,
	 --help,  K: -k,
	 --keys,  M: $MAKEPPINFOFLAGS,	Q: -q,
	 --quiet,  T: -t,
	 --traverse,  V: -V,

       makeppinfo option file ...

       mppi option file	...

       Makepp writes detailed information about	the files it built and about
       their dependencies.  This information is	stored in the .makepp
       subdirectory along the file it pertains to.  It has the form of key-
       value pairs.  In	some cases the value will again	be a list of
       associated pairs, typically the signature and the file.

       If both "ENV_DEPS" and "ENV_VALS" get displayed,	they are merged	into a
       two column table.

       If both "DEP_SIGS" and "SORTED_DEPS" get	displayed, they	are merged
       into a two column table (in this	order which gives a better layout).
       Each dependency has a "SIGNATURE" which is only "timestamp,size", used
       only to check if	the file must be rescanned.  The interesting
       information is stored in	some other key,	for the	built in signatures as

       o   "C_MD5_SUM" for "C" or "c_compilation_md5"

       o   "MD5_SUM" for "md5"

       o   "SHARED_OBJECT" for "shared_object"

       o   "V_MD5_SUM" for "verilog_synthesis_md5"

       o   "XML_MD5_SUM" for "xml"

       o   "XML_SPACE_MD5_SUM" for "xml_space"

       These signature lists are the most frequent reason for rebuilding a
       file, so	you might like to check, whether the signature stored for a
       dependency matches the current build_signature of that file.  If	the
       signatures and everything else matches, that is the basis for getting a
       file from (one of) your repositories or build cache if it is found
       there.  The details depend on the applicable build check	method.

       You will	encounter two kinds of signatures: simple ones consist of two
       comma separated numbers,	which are the timestamp	in file	system format
       (seconds	since 1970) and	the size.  For some files makepp will
       additionally have the relevant smart signature which is a base64
       encoded (letters, digits, slash and plus) MD5 sum of the	plain or
       digested	file contents.

       This command is partially a makepp debug	tool.  The list	of keys	varies
       depending on which scanner, build check and signature was used.	To
       fully understand	the output, you	may need to look at the	source code.
       That said, there	is also	some generally interesting information to be

       Valid options are:

       -A filename
	   Read	the file and parse it as possibly quoted whitespace- and/or
	   newline-separated options.

	   In the simple signatures prepend the	1st number, the	raw date-time,
	   with	its human readable form	in parentheses.

	   Display info	even when it is	invalid	because	of inexistent or
	   modified file.  In this case	the key	"SIGNATURE" is replaced	by
	   "invalidated_SIGNATURE" and the value indicates in parentheses that
	   the file was	deleted	or what	signature the file now has.

	   Print out a brief summary of	the options.

       -k list
	   The list specifies one or more space	separated Shell	style patterns
	   (with [xyz],	?, *, {a,bc,def}).  Remember to	protect	these from
	   your	Shell by quoting.  These are matched against the keys.	Each
	   pattern may be preceded with	an exclamation mark ("!") or a caret
	   ("^") to exclude the	matched	keys from those	selected before
	   instead of adding them to the selection.  If	the first pattern
	   starts with an exclamation mark, it operates	on all keys.

	       --keys='COMMAND CWD'	   # How was this built	and where (relative to file).

	   If you want only filenames (useful with "-t|--traverse") select an
	   inexistent key like "none".

	   Don't list file and key names.  Repeat to also omit warnings.

	   Also	output the same	information for	each file in SORTED_DEPS
	   (recursively	if repeated).

	   Print out the version number.

       Each build check	method documents how to	see what they base their
       decision	on.  Finding the paths of the dependencies is the same in all
       cases, so it is shown here.  If you build to a different	directory,
       finding the path	of the inputs requires a translation relative to CWD.
       E.g. either short or long form:

	   makeppinfo --keys='CWD SORTED_DEPS' obj/b.o
	   mppi	-k'CWD SORTED_DEPS' obj/b.o

       CWD is the directory relative to	file, from where it was	built.	That
       directory is the	one from where all relative paths in SORTED_DEPS
       start.  This means that under the same directory	we have	inputs src/b.c
       and src/inc/b.h and an output obj/b.o.  From the	viewpoint of b.o, the
       inputs are ../src/b.c and ../src/inc/b.h.  It does not matter that we
       gave a relative path for	b.o, the information shown would be the	same,
       had we first changed to obj.

   The reason for a rebuild
       In some cases makepp may	be repeatedly rebuilding a seemingly up	to
       date file.  If "makepplog" does not help	here, this command gives you
       the exact state of affairs:

	   makeppinfo --traverse somefile
	   mppi	-t somefile

       When this reproducibly happens, issue this command before and after,
       and compare the outputs.	 The things that differ	are the	reason of the

   Proving Consistency
       Sometimes you will change your Makefiles	and wonder if they still do
       the same	thing.	Here's a command that tells you	exactly	how makepp
       built somefile:

	   makeppinfo --traverse --traverse --keys='CWD	COMMAND' somefile
	   mppi	-ttk'CWD SORTED_DEPS' somefile

       This will recursively traverse over all dependencies of somefile	and
       tell you	in which directory it issued which command.  By	running	this
       after the old and after the new build and comparing the outputs,	you
       can see what changed.

       The same	works for testing a new	version	of makepp, though some older
       versions	would handle whitespace	in command continuation	lines
       differently, and	there was a bug	in sort	order, which can make the
       files come out in a different order.  If	this is	the case for you, let
       the Shell assemble the sorted arguments:

	   makeppinfo --keys='CWD COMMAND' `makeppinfo --traverse --traverse --keys=none somefile|tr -d	:|sort`
	   mppi	-k'CWD SORTED_DEPS' `mppi -ttknone somefile|tr -d :|sort`

       Makeppinfo looks	at the following environment variable:

	   Any flags in	this environment variable are interpreted as command
	   line	options	before any explicit options.  Quotes are interpreted
	   like	in makefiles.

       Daniel Pfeiffer (

perl v5.32.1			  2012-02-07			 MAKEPPINFO(1)


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