relnotes

jam源码

        CCDEFS properly: on VMS they can't be appended to, because
        multiple /define or /include directives don't work.  Instead
        now CCHDRS and CCDEFS is reformatted from HDRS and DEFINES
        anytime those latter two change.  This requires the recent
        change to jam to allow access to target-specific variables
        when setting other variables.

        [VMS] Remove exception call when file_dirscan() can't, for
        some reason, scan a directory.  Use a better set of #ifdefs to
        determine if we're on a vax, rather than relying on the C
        compiler being a specific version: we're able to build with
        the C++ compiler now.

	[VMS] Port new jam to run with just cxx compiler.
        (The C compiler being a extra-cost item).

        [NT] Add entry for DevStudio when the settings are already in the
        system environment.

        [NT] default $(MV) to "move /y" in Jambase.

	[MINGW] Mingw port by Max Blagai.

===============================================================================
===============================================================================


Release notes for Jam 2.3
(aka Jam - make(1) redux)

0.  Bugs fixed since 2.3.1

	PATCHLEVEL 2 - 3/12/2001

	NOCARE changed back: it once again does not applies to targets
	with sources and/or actions.  In 2.3 it was changed to apply to
	such targets, but that broke header file builds: files that are
	#included get marked with NOCARE, but if they have source or
	actions, they still should get built.

1.  Release info:

	Jam 2.3
	November 16, 2000
	VERSION 2.3
	PATCHLEVEL 1

2.  Compatibility

	Jam 2.3 is upward compatible with Jam 2.2.

	The Jam 2.3 language is a superset of the 2.2 language;
	Jamfiles, Jambase, and other rulesets used in 2.2 can be used
	with the 2.3 language support.

3.  Changes since 2.2

3.1.  Changes to Jam Language

	Rules now can have values, which can expanded into a list with
	the new "[ rule args ... ]" syntax.  A rule's value is the value
	of its last statement, though only the following statements have
	values: if (value of the leg chosen), switch (ditto), set (value
	of the resulting variable), return (its arguments).  Note that
	'return' doesn't actually return.  This support is EXPERIEMENTAL
	and otherwise undocumented.  (2.3.1)

	Because of the new way lists are processed, if a rule has no
	targets a warning message is no longer issued.

	NOCARE now applies to targets with sources and/or actions,
	rather than just those without.

3.2.  Jambase Changes

	The HDRPATTERN variable now allows for leading blanks before
	the #include, to keep up with ANSI.  By [e-mail]
	(John Belmonte) (2.2.3).

	HDRPATTERN has been adjusted to avoid mistaking cases like:

		# include <time.h> /* could be <sys/time.h> */

	MkDir now NOUPDATE's $(DOT), so that there are no dependencies
	on the current directory's timestamp.  By [e-mail]
	(John Belmonte).

	The old mock functions like makeDirName, which assigned their
	results to the variable named as their first argument, have
	been replaced with real functions using the new [] syntax.
	E.g. "makeDirName foo : bar ola" is now "foo = [ fDirName bar ]"

	Install now always does a cp/chmod/etc, rather than using
	the system's install(1), which invariably seems broken.

3.3.  Jam internal code changes

	$JAMUNAME is set on UNIX.  (2.2.4).

	Jam ANSI-fied (2.3.0).

	jam.h now defines a bunch of symbols used by the other source
	files, so as minimize compiler- and platform-specific ifdefs.

	OSVER is no longer set by jam.h (it was only set for AIX).
	Jam does not depend on this variable at all, except to set
	$(OSFULL), which is used to determine jam's build directory.
	If the user needs to distinguish between various revs of 
	OSs, he must set OSVER in the environment.

4.  Fixed bugs

	Redefining a rule while it was executing could cause jam to
	crash.  Reference counts are now used to prevent that, thanks
	to Matt Armstrong.

	Logic for computing chunk size when executing PIECEMEAL rules
	has been reworked to be a little more accurate, without danger
	of overflow, at the cost of being a little more compute intensive.
	Instead of computing an estimate chunksize in the (now gone)
	make1chunk(), make1cmds() now just goes full bore and tries to
	use all args.  When that fails, it backs off by 10% of the source
	args until the command fits.  It takes a little bit more compute
	time compared to the old logic, but when you're executing actions
	to build all of Shinola it's still pretty small in the scheme
	of things.

	The NT handle leak in execunix.c has been fixed, thanks to
	Gurusamy Sarathy.  (2.2.1).

5.  Porting

	Platforms newly supported or updated:

	    AmigaOS (with gcc), courtesy of Alain Penders (2.2.2).

	    Beos

	    CYGWIN 1.1.4, courtesy of John Belmonte <[e-mail]>.

	    IBM AS400 via Visual Age on NT (primitive)

	    IBM OS/390 Unix System Services

	    Linux SuSE on OS390

	    Linux Mips, ARM

	    Lynx

	    HPUX 11, IA64

	    Mac OS X Server, courtesy of [e-mail] (2.2.5).

	    Mac Rhapsody

	    MPE IX 6.0

	    NetBSD

	    QNX RTP (QNX 6.0)

	    Siemens Sinix

	    UNICOS

	    VMS 6.2, 7.1

	    Windows NT IA64

5.1.  NT Porting Notes

	Always create tmp .bat file for actions if JAMSHELL is set.
	That way, if JAMSHELL is a .bat file itself, it can handle
	single-command actions with more than 9 cmd line args.

	COMSPEC is no longer examined: cmd.exe is always used
	instead.  Only cmd.exe can execute the Jambase rules anyhow.

	Jam can be built with Borland C++ 5.5.

	OS2 fixes: InstallBin now works.  Filenames are now downshifted,
	so mixed case works better there, too.  file_dirscan() can now scan 
	the root ("c:\" or "\") directory, which it couldn't handle before.

	var_defines now ignores OS=Windows_NT, because it conflicts
	with Jam's setting of OS (to NT).

5.2. Mac OS 8/9 Notes

	The support for Mac is curious at best.  It runs under MPW.

	It requires CodeWarrior Pro 5, but no longer requires GUSI.

	Use Build.mpw to bootstrap the build.

	The Mac specific definitions in the Jambase are not intended
	to be of general purpose, but are sufficient to have Jam build
	itself.

===============================================================================
===============================================================================


Release Notes for Jam 2.2

1.  Release info:

	Jam 2.2
	October 22, 1997
	VERSION 2.2
	PATCHLEVEL 1

2. Compatibility

	Jam 2.2 is a roll-up of 'Jam - make(1) redux' release 2.1+.
	Most of the changes described below were available before this,
	in the jam.2.1.plus.tar ball.

	The Jam 2.2 language is a superset of the 2.1 language;
	Jamfiles, Jambase, and other rulesets used in 2.1 can be used
	with the 2.2 language support.

	See 'Jambase Changes', below, to see if your Jamfiles need any
	changes to work with the 2.2 Jambase.


3. Changes Since 2.1

	New product name: Jam. (Executable program is still named 'jam'.)

	Documentation rewritten; HTML versions supplied.


3.1 Changes to Jam Language 

	Rules may now have more fields than just $(<) and $(>).

	Local variables are now supported.

	The expression 'if $(A) in $(B)' is now supported.

	New variable modifiers :U and :L result in uppercased or lowercased
	values.

	New variable modifier :P reliably results in parent directory
	of either a file or directory. (Previously, :D was used, but on VMS
	:D of a directory name is just the directory name.)

	The :S variable modifier now results in the _last_ suffix if a 
	filename has more than one dot (.) in it.

	New predefined $(JAMDATE) variable is initialized at runtime for 
	simple date stamping.

	New predefined variables $(OSVER) and $(OSPLAT) are used to 
	distinguish among operating system versions and hardware platforms,
	when possible.

	New 'bind' qualifier on action definitions allows variables
	other than $(<) and $(>) to be bound with SEARCH and LOCATE paths.

	Action buffer size is no longer limited by MAXCMD. Instead, each 
	line in an action is limited by MAXLINE, defined for each OS, and 
	the entire action size is limited by CMDBUF.


3.2 Jambase Changes (See Jamfile.html)

	Jambase has been reworked to incorporate new language features.

	A handful of new utility rules has been added: makeString,
	makeDirName, etc.

	New HDRGRIST variable in Jambase allows for headers with the same
	name to be distinguished.

	LOCATE_TARGET now has a new flavor, LOCATE_SOURCE, that is used by
	rules that generate source files (e.g., Yacc and Lex).

	Header file includes now happen in the proper order. The limit of
	10 include files has been eliminated.

	The old "Install" rule is no longer available.  Use InstallBin, 
	InstallFile, InstallLib, InstallMan, or InstallShell instead.


3.3 'jam' Changes (See Jam.html)

	'jam' can now be built as a stand-alone program, with Jambase 
	compiled into the executable. An external or alternate Jambase can 
	still be referenced explicitly with -f.

	On command failure, 'jam' now emits the text of the command that 
	failed.  This is a compromise between the normal -d1 behavior (where 
	commands were never seen) and -d2 (where commands are always seen).

	'jam' now exits non-zero if it doesn't have a total success.  A parse
	error, sources that can't be found, and targets that can't be built
	all generate non-zero exit status.
	
	The debugging levels (-d flags) have been slightly redefined.

	The supplied Jamfile now builds 'jam' into a platform specific 
	subdirectory. This lets you use the same source directory to
	build 'jam' for more than one platform.

	The supplied Jamfile does not rebuild generated source files by 
	default. (They are supplied with the distribution.) See Jamfile
	for more information.


4.  Fixed Bugs

	The 'include' bug has finally been fixed, so that include
	statements take effect exactly when they are executed,
	rather than after the current statement block.  This also
	corrects the problem where an 'include' within an 'if'
	block would wind up including the file one token after the
	'if' block's closing brace.  Credit goes to Thomas Woods
	for suggesting that the parse tree generation and parse
	tree execution be paired in their own loop, rather than
	having the parser execute the tree directly.

	The setting and extracting of grist has been regularized:
	normally, if you set a component of a filename (using the
	:DBSMG= modifiers), you are supposed to include the delimiters
	that set off the component:  that is, you say "$(x:S=.suffix)",
	including the ".".  But with grist it was inconsistent
	between setting and getting: setting grist required no
	<>'s, while getting grist included them.   Getting grist
	continues to return the <>'s, but now setting grist can
	either include them (the new way) or not (the old way).

	'actions together' now suppresses duplicate sources from
	showing up in $(>).

	Accessing variables whose names contained ['s (as happens with
	MkDir on VMS) wasn't working, because it treated the [ as an
	array subscript. Now [ and ] are, like :, handled specially so 
	that they can appear in variable values.

	The 'if' statement now compares all elements in expressions;
	previously, it only compared the first element of each list.

	If a command line in an action is longer than MAXLINE (formerly
	MAXCMD), 'jam' now issues an error and exits rather than dumping 
	core.

	If a Jamfile ended without a trailing newline, jam dumped core.
	This has been fixed.


5.  Porting

	See jam.h for the definitive list of supported platforms.
	Since 2.1, support has been added for:

	    Macintosh MPW
	    Alpha VMS
	    Alpha NT
	    NT PowerPC
	    BeOS
	    MVS OE
	    UNIXWARE
	    QNX
	    SINIX (Nixdorf)
	    OS/2
	    Interactive UNIX (ISC), courtesy of Matthew Newhook


5.1 NT Support Fixes

	The NT command executor now handles multiple line actions, by writing
	multi-line actions to a batch file and executing that.
	
	Targets are universally lowercased on NT. (Matthew Newhook)