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NEWS
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GNU make NEWS -*-indented-text-*-
History of user-visible changes.
16 Sep 2013
See the end of this file for copyrights and conditions.
All changes mentioned here are more fully described in the GNU make
manual, which is contained in this distribution as the file doc/make.texi.
See the README file and the GNU make manual for instructions for
reporting bugs.
Version 3.99.91
A complete list of bugs fixed in this version is available here:
http://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=101&set=custom
* WARNING: Backward-incompatibility!
If .POSIX is specified, then make adheres to the POSIX backslash/newline
handling requirements, which introduces the following changes to the
standard backslash/newline handling in non-recipe lines:
* Any trailing space before the backslash is preserved
* Each backslash/newline (plus subsequent whitespace) is converted to a
single space
* New command line option: --output-sync (-O) enables grouping of output by
target or by recursive make. This is useful during parallel builds to avoid
mixing output from different jobs together giving hard-to-understand
results. Original implementation by David Boyce <dsb@boyski.com>.
Reworked and enhanced by Frank Heckenbach <f.heckenbach@fh-soft.de>.
Windows support by Eli Zaretskii <eliz@gnu.org>.
* New command line option: --trace enables tracing of targets. When enabled
the recipe to be invoked is printed even if it would otherwise be suppressed
by .SILENT or a "@" prefix character. Also before each recipe is run the
makefile name and linenumber where it was defined are shown as well as the
prerequisites that caused the target to be considered out of date.
* New command line option argument: --debug now accepts a "n" (none) flag
which disables all debugging settings that are currently enabled.
* New feature: The "job server" capability is now supported on Windows.
Implementation contributed by Troy Runkel <Troy.Runkel@mathworks.com>
* New feature: The .ONESHELL capability is now supported on Windows. Support
added by Eli Zaretskii <eliz@gnu.org>.
* New feature: "!=" shell assignment operator as an alternative to the
$(shell ...) function. Implemented for compatibility with BSD makefiles.
WARNING: Backward-incompatibility!
Variables ending in "!" previously defined as "variable!= value" will now be
interpreted as shell assignment. Change your assignment to add whitespace
between the "!" and "=": "variable! = value"
* New feature: "::=" simple assignment operator as defined by POSIX in 2012.
This operator has identical functionality to ":=" in GNU make, but will be
portable to any implementation of make conforming to a sufficiently new
version of POSIX (see http://austingroupbugs.net/view.php?id=330). It is
not necessary to define the .POSIX target to access this operator.
* New feature: GNU Guile integration
This version of GNU make can be compiled with GNU Guile integration.
GNU Guile serves as an embedded extension language for make.
See the "Guile Function" section in the GNU Make manual for details.
* New feature: Loadable objects
This version of GNU make contains a "technology preview": the ability to
load dynamic objects into the make runtime. These objects can be created by
the user and can add extended functionality, usable by makefiles.
* New function: $(file ...) writes to a file.
* New variable: $(GNUMAKEFLAGS) will be parsed for make flags, just like
MAKEFLAGS is. It can be set in the environment or the makefile, containing
GNU make-specific flags to allow your makefile to be portable to other
versions of make. GNU make never sets or modifies GNUMAKEFLAGS.
* New variable: `MAKE_HOST' gives the name of the host architecture
make was compiled for. This is the same value you see after 'Built for'
when running 'make --version'.
* Behavior of MAKEFLAGS and MFLAGS is more rigorously defined. All simple
flags are grouped together in the first word of MAKEFLAGS. No options that
accept arguments appear there. If no simple flags are present MAKEFLAGS
begins with a space. MFLAGS never begins with "- ".
* Setting the -r and -R options in MAKEFLAGS inside a makefile now works as
expected, removing all built-in rules and variables, respectively.
* If a recipe fails, the makefile name and linenumber of the recipe are shown.
* A .RECIPEPREFIX setting is remembered per-recipe and variables expanded
in that recipe also use that recipe prefix setting.
* In -p output, .RECIPEPREFIX settings are shown and all target-specific
variables are output as if in a makefile, instead of as comments.
* On MS-Windows, recipes that use ".." quoting will no longer force
invocation of commands via temporary batch files and stock Windows
shells, they will be short-circuited and invoked directly. (In
other words, " is no longer a special character for stock Windows
shells.) This avoids hitting shell limits for command length when
quotes are used, but nothing else in the command requires the shell.
This change could potentially mean some minor incompatibilities in
behavior when the recipe uses quoted string on shell command lines.
Version 3.82 (28 Jul 2010)
A complete list of bugs fixed in this version is available here:
http://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=104&set=custom
* Compiling GNU make now requires a conforming ISO C 1989 compiler and
standard runtime library.
* WARNING: Backward-incompatibility!
The POSIX standard for make was changed in the 2008 version in a
fundamentally incompatible way: make is required to invoke the shell as if
the '-e' flag were provided. Because this would break many makefiles that
have been written to conform to the original text of the standard, the
default behavior of GNU make remains to invoke the shell with simply '-c'.
However, any makefile specifying the .POSIX special target will follow the
new POSIX standard and pass '-e' to the shell. See also .SHELLFLAGS
below.
* WARNING: Backward-incompatibility!
The '$?' variable now contains all prerequisites that caused the target to
be considered out of date, even if they do not exist (previously only
existing targets were provided in $?).
* WARNING: Backward-incompatibility!
Wildcards were not documented as returning sorted values, but the results
have been sorted up until this release.. If your makefiles require sorted
results from wildcard expansions, use the $(sort ...) function to request
it explicitly.
* WARNING: Backward-incompatibility!
In previous versions of make it was acceptable to list one or more explicit
targets followed by one or more pattern targets in the same rule and it
worked "as expected". However, this was not documented as acceptable and if
you listed any explicit targets AFTER the pattern targets, the entire rule
would be mis-parsed. This release removes this ability completely: make
will generate an error message if you mix explicit and pattern targets in
the same rule.
* WARNING: Backward-incompatibility!
As a result of parser enhancements, three backward-compatibility issues
exist: first, a prerequisite containing an "=" cannot be escaped with a
backslash any longer. You must create a variable containing an "=" and
use that variable in the prerequisite. Second, variable names can no
longer contain whitespace, unless you put the whitespace in a variable and
use the variable. Third, in previous versions of make it was sometimes
not flagged as an error for explicit and pattern targets to appear in the
same rule. Now this is always reported as an error.
* WARNING: Backward-incompatibility!
The pattern-specific variables and pattern rules are now applied in the
shortest stem first order instead of the definition order (variables
and rules with the same stem length are still applied in the definition
order). This produces the usually-desired behavior where more specific
patterns are preferred. To detect this feature search for 'shortest-stem'
in the .FEATURES special variable.
* WARNING: Backward-incompatibility!
The library search behavior has changed to be compatible with the standard
linker behavior. Prior to this version for prerequisites specified using
the -lfoo syntax make first searched for libfoo.so in the current
directory, vpath directories, and system directories. If that didn't yield
a match, make then searched for libfoo.a in these directories. Starting
with this version make searches first for libfoo.so and then for libfoo.a
in each of these directories in order.
* New command line option: --eval=STRING causes STRING to be evaluated as
makefile syntax (akin to using the $(eval ...) function). The evaluation
is performed after all default rules and variables are defined, but before
any makefiles are read.
* New special variable: .RECIPEPREFIX allows you to reset the recipe
introduction character from the default (TAB) to something else. The
first character of this variable value is the new recipe introduction
character. If the variable is set to the empty string, TAB is used again.
It can be set and reset at will; recipes will use the value active when
they were first parsed. To detect this feature check the value of
$(.RECIPEPREFIX).
* New special variable: .SHELLFLAGS allows you to change the options passed
to the shell when it invokes recipes. By default the value will be "-c"
(or "-ec" if .POSIX is set).
* New special target: .ONESHELL instructs make to invoke a single instance
of the shell and provide it with the entire recipe, regardless of how many
lines it contains. As a special feature to allow more straightforward
conversion of makefiles to use .ONESHELL, any recipe line control
characters ('@', '+', or '-') will be removed from the second and
subsequent recipe lines. This happens _only_ if the SHELL value is deemed
to be a standard POSIX-style shell. If not, then no interior line control
characters are removed (as they may be part of the scripting language used
with the alternate SHELL).
* New variable modifier 'private': prefixing a variable assignment with the
modifier 'private' suppresses inheritance of that variable by
prerequisites. This is most useful for target- and pattern-specific
variables.
* New make directive: 'undefine' allows you to undefine a variable so that
it appears as if it was never set. Both $(flavor) and $(origin) functions
will return 'undefined' for such a variable. To detect this feature search
for 'undefine' in the .FEATURES special variable.
* The parser for variable assignments has been enhanced to allow multiple
modifiers ('export', 'override', 'private') on the same line as variables,
including define/endef variables, and in any order. Also, it is possible
to create variables and targets named as these modifiers.
* The 'define' make directive now allows a variable assignment operator
after the variable name, to allow for simple, conditional, or appending
multi-line variable assignment.
Version 3.81 (01 Apr 2006)
* GNU make is ported to OS/2.
* GNU make is ported to MinGW. The MinGW build is only supported by
the build_w32.bat batch file; see the file README.W32 for more
details.
* WARNING: Future backward-incompatibility!
Up to and including this release, the '$?' variable does not contain
any prerequisite that does not exist, even though that prerequisite
might have caused the target to rebuild. Starting with the _next_
release of GNU make, '$?' will contain all prerequisites that caused
the target to be considered out of date. See this Savannah bug:
http://savannah.gnu.org/bugs/index.php?func=detailitem&item_id=16051
* WARNING: Backward-incompatibility!
GNU make now implements a generic "second expansion" feature on the
prerequisites of both explicit and implicit (pattern) rules. In order
to enable this feature, the special target '.SECONDEXPANSION' must be
defined before the first target which takes advantage of it. If this
feature is enabled then after all rules have been parsed the
prerequisites are expanded again, this time with all the automatic
variables in scope. This means that in addition to using standard
SysV $$@ in prerequisites lists, you can also use complex functions
such as $$(notdir $$@) etc. This behavior applies to implicit rules,
as well, where the second expansion occurs when the rule is matched.
However, this means that when '.SECONDEXPANSION' is enabled you must
double-quote any "$" in your filenames; instead of "foo: boo$$bar" you
now must write "foo: foo$$$$bar". Note that the SysV $$@ etc. feature,
which used to be available by default, is now ONLY available when the
.SECONDEXPANSION target is defined. If your makefiles take advantage
of this SysV feature you will need to update them.
* WARNING: Backward-incompatibility!
In order to comply with POSIX, the way in which GNU make processes
backslash-newline sequences in recipes has changed. If your makefiles
use backslash-newline sequences inside of single-quoted strings in
recipes you will be impacted by this change. See the GNU make manual
subsection "Splitting Recipe Lines" (node "Splitting Lines"), in
section "Recipe Syntax", chapter "Writing Recipe in Rules", for
details.
* WARNING: Backward-incompatibility!
Some previous versions of GNU make had a bug where "#" in a function
invocation such as $(shell ...) was treated as a make comment. A
workaround was to escape these with backslashes. This bug has been
fixed: if your makefile uses "\#" in a function invocation the
backslash is now preserved, so you'll need to remove it.
* New command line option: -L (--check-symlink-times). On systems that
support symbolic links, if this option is given then GNU make will
use the most recent modification time of any symbolic links that are
used to resolve target files. The default behavior remains as it
always has: use the modification time of the actual target file only.
* The "else" conditional line can now be followed by any other valid
conditional on the same line: this does not increase the depth of the
conditional nesting, so only one "endif" is required to close the
conditional.
* All pattern-specific variables that match a given target are now used
(previously only the first match was used).
* Target-specific variables can be marked as exportable using the
"export" keyword.
* In a recursive $(call ...) context, any extra arguments from the outer
call are now masked in the context of the inner call.
* Implemented a solution for the "thundering herd" problem with "-j -l".
This version of GNU make uses an algorithm suggested by Thomas Riedl
<thomas.riedl@siemens.com> to track the number of jobs started in the
last second and artificially adjust GNU make's view of the system's
load average accordingly.
* New special variables available in this release:
- .INCLUDE_DIRS: Expands to a list of directories that make searches
for included makefiles.
- .FEATURES: Contains a list of special features available in this
version of GNU make.
- .DEFAULT_GOAL: Set the name of the default goal make will
use if no goals are provided on the command line.
- MAKE_RESTARTS: If set, then this is the number of times this
instance of make has been restarted (see "How Makefiles Are Remade"
in the manual).
- New automatic variable: $| (added in 3.80, actually): contains all
the order-only prerequisites defined for the target.
* New functions available in this release:
- $(lastword ...) returns the last word in the list. This gives
identical results as $(word $(words ...) ...), but is much faster.
- $(abspath ...) returns the absolute path (all "." and ".."
directories resolved, and any duplicate "/" characters removed) for
each path provided.
- $(realpath ...) returns the canonical pathname for each path
provided. The canonical pathname is the absolute pathname, with
all symbolic links resolved as well.
- $(info ...) prints its arguments to stdout. No makefile name or
line number info, etc. is printed.
- $(flavor ...) returns the flavor of a variable.
- $(or ...) provides a short-circuiting OR conditional: each argument
is expanded. The first true (non-empty) argument is returned; no
further arguments are expanded. Expands to empty if there are no
true arguments.
- $(and ...) provides a short-circuiting AND conditional: each
argument is expanded. The first false (empty) argument is
returned; no further arguments are expanded. Expands to the last
argument if all arguments are true.
* Changes made for POSIX compatibility:
- Only touch targets (under -t) if they have a recipe.
- Setting the SHELL make variable does NOT change the value of the
SHELL environment variable given to programs invoked by make. As
an enhancement to POSIX, if you export the make variable SHELL then
it will be set in the environment, just as before.
* On MS Windows systems, explicitly setting SHELL to a pathname ending
in "cmd" or "cmd.exe" (case-insensitive) will force GNU make to use
the DOS command interpreter in batch mode even if a UNIX-like shell
could be found on the system.
* On VMS there is now support for case-sensitive filesystems such as ODS5.
See the readme.vms file for information.
* Parallel builds (-jN) no longer require a working Bourne shell on
Windows platforms. They work even with the stock Windows shells, such
as cmd.exe and command.com.
* Updated to autoconf 2.59, automake 1.9.5, and gettext 0.14.1. Users
should not be impacted.
* New translations for Swedish, Chinese (simplified), Ukrainian,
Belarusian, Finnish, Kinyarwandan, and Irish. Many updated
translations.
A complete list of bugs fixed in this version is available here:
http://savannah.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=103
Version 3.80 (03 Oct 2002)
* A new feature exists: order-only prerequisites. These prerequisites
affect the order in which targets are built, but they do not impact
the rebuild/no-rebuild decision of their dependents. That is to say,
they allow you to require target B be built before target A, without
requiring that target A will always be rebuilt if target B is updated.
Patch for this feature provided by Greg McGary <greg@mcgary.org>.
* For compatibility with SysV make, GNU make now supports the peculiar
syntax $$@, $$(@D), and $$(@F) in the prerequisites list of a rule.
This syntax is only valid within explicit and static pattern rules: it
cannot be used in implicit (suffix or pattern) rules. Edouard G. Parmelan
<egp@free.fr> provided a patch implementing this feature; however, I
decided to implement it in a different way.
* The argument to the "ifdef" conditional is now expanded before it's
tested, so it can be a constructed variable name.
Similarly, the arguments to "export" (when not used in a variable
definition context) and "unexport" are also now expanded.
* A new function is defined: $(value ...). The argument to this
function is the _name_ of a variable. The result of the function is
the value of the variable, without having been expanded.
* A new function is defined: $(eval ...). The arguments to this
function should expand to makefile commands, which will then be
evaluated as if they had appeared in the makefile. In combination
with define/endef multiline variable definitions this is an extremely
powerful capability. The $(value ...) function is also sometimes
useful here.
* A new built-in variable is defined, $(MAKEFILE_LIST). It contains a
list of each makefile GNU make has read, or started to read, in the
order in which they were encountered. So, the last filename in the
list when a makefile is just being read (before any includes) is the
name of the current makefile.
* A new built-in variable is defined: $(.VARIABLES). When it is
expanded it returns a complete list of variable names defined by all
makefiles at that moment.
* A new command line option is defined, -B or --always-make. If
specified GNU make will consider all targets out-of-date even if they
would otherwise not be.
* The arguments to $(call ...) functions were being stored in $1, $2,
etc. as recursive variables, even though they are fully expanded
before assignment. This means that escaped dollar signs ($$ etc.)
were not behaving properly. Now the arguments are stored as simple
variables. This may mean that if you added extra escaping to your
$(call ...) function arguments you will need to undo it now.
* The variable invoked by $(call ...) can now be recursive: unlike other
variables it can reference itself and this will not produce an error
when it is used as the first argument to $(call ...) (but only then).
* New pseudo-target .LOW_RESOLUTION_TIME, superseding the configure
option --disable-nsec-timestamps. You might need this if your build
process depends on tools like "cp -p" preserving time stamps, since
"cp -p" (right now) doesn't preserve the subsecond portion of a time
stamp.
* Updated translations for French, Galician, German, Japanese, Korean,
and Russian. New translations for Croatian, Danish, Hebrew, and
Turkish.
* Updated internationalization support to Gettext 0.11.5.
GNU make now uses Gettext's "external" feature, and does not include
any internationalization code itself. Configure will search your
system for an existing implementation of GNU Gettext (only GNU Gettext
is acceptable) and use it if it exists. If not, NLS will be disabled.
See ABOUT-NLS for more information.
* Updated to autoconf 2.54 and automake 1.7. Users should not be impacted.
A complete list of bugs fixed in this version is available here:
http://savannah.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=102
Version 3.79.1 (23 Jun 2000)
* .SECONDARY with no prerequisites now prevents any target from being
removed because make thinks it's an intermediate file, not just those
listed in the makefile.
* New configure option --disable-nsec-timestamps, but this was
superseded in later versions by the .LOW_RESOLUTION_TIME pseudo-target.
Version 3.79 (04 Apr 2000)
* GNU make optionally supports internationalization and locales via the
GNU gettext (or local gettext if suitable) package. See the ABOUT-NLS
file for more information on configuring GNU make for NLS.
* Previously, GNU make quoted variables such as MAKEFLAGS and
MAKEOVERRIDES for proper parsing by the shell. This allowed them to
be used within make build scripts. However, using them there is not
proper behavior: they are meant to be passed to subshells via the
environment. Unfortunately the values were not quoted properly to be
passed through the environment. This meant that make didn't properly
pass some types of command line values to submakes.
With this version we change that behavior: now these variables are
quoted properly for passing through the environment, which is the
correct way to do it. If you previously used these variables
explicitly within a make rule you may need to re-examine your use for
correctness given this change.
* A new pseudo-target .NOTPARALLEL is available. If defined, the
current makefile is run serially regardless of the value of -j.
However, submakes are still eligible for parallel execution.
* The --debug option has changed: it now allows optional flags
controlling the amount and type of debugging output. By default only
a minimal amount information is generated, displaying the names of
"normal" targets (not makefiles) that were deemed out of date and in
need of being rebuilt.
Note that the -d option behaves as before: it takes no arguments and
all debugging information is generated.
* The `-p' (print database) output now includes filename and linenumber
information for variable definitions, to aid debugging.
* The wordlist function no longer reverses its arguments if the "start"
value is greater than the "end" value. If that's true, nothing is
returned.
* Hartmut Becker provided many updates for the VMS port of GNU make.
See the readme.vms file for more details.
Version 3.78 (22 Sep 1999)
* Two new functions, $(error ...) and $(warning ...) are available. The
former will cause make to fail and exit immediately upon expansion of
the function, with the text provided as the error message. The latter
causes the text provided to be printed as a warning message, but make
proceeds normally.
* A new function $(call ...) is available. This allows users to create
their own parameterized macros and invoke them later. Original
implementation of this function was provided by Han-Wen Nienhuys
<hanwen@cs.uu.nl>.
* A new function $(if ...) is available. It provides if-then-else
capabilities in a builtin function. Original implementation of this
function was provided by Han-Wen Nienhuys <hanwen@cs.uu.nl>.
* Make defines a new variable, .LIBPATTERNS. This variable controls how
library dependency expansion (dependencies like ``-lfoo'') is performed.
* Make accepts CRLF sequences as well as traditional LF, for
compatibility with makefiles created on other operating systems.
* Make accepts a new option: -R, or --no-builtin-variables. This option
disables the definition of the rule-specific builtin variables (CC,
LD, AR, etc.). Specifying this option forces -r (--no-builtin-rules)
as well.
* A "job server" feature, suggested by Howard Chu <hyc@highlandsun.com>.
On systems that support POSIX pipe(2) semantics, GNU make can now pass
-jN options to submakes rather than forcing them all to use -j1. The
top make and all its sub-make processes use a pipe to communicate with
each other to ensure that no more than N jobs are started across all
makes. To get the old behavior of -j back, you can configure make
with the --disable-job-server option.
* The confusing term "dependency" has been replaced by the more accurate
and standard term "prerequisite", both in the manual and in all GNU make
output.
* GNU make supports the "big archive" library format introduced in AIX 4.3.
* GNU make supports large files on AIX, HP-UX, and IRIX. These changes
were provided by Paul Eggert <eggert@twinsun.com>. (Large file
support for Solaris and Linux was introduced in 3.77, but the
configuration had issues: these have also been resolved).
* The Windows 95/98/NT (W32) version of GNU make now has native support
for the Cygnus Cygwin release B20.1 shell (bash).
* The GNU make regression test suite, long available separately "under
the table", has been integrated into the release. You can invoke it
by running "make check" in the distribution. Note that it requires
Perl (either Perl 4 or Perl 5) to run.
Version 3.77 (28 Jul 1998)
* Implement BSD make's "?=" variable assignment operator. The variable
is assigned the specified value only if that variable is not already
defined.
* Make defines a new variable, "CURDIR", to contain the current working
directory (after the -C option, if any, has been processed).
Modifying this variable has no effect on the operation of make.
* Make defines a new default RCS rule, for new-style master file
storage: ``% :: RCS/%'' (note no ``,v'' suffix).
Make defines new default rules for DOS-style C++ file naming
conventions, with ``.cpp'' suffixes. All the same rules as for
``.cc'' and ``.C'' suffixes are provided, along with LINK.cpp and
COMPILE.cpp macros (which default to the same value as LINK.cc and
COMPILE.cc). Note CPPFLAGS is still C preprocessor flags! You should
use CXXFLAGS to change C++ compiler flags.
* A new feature, "target-specific variable values", has been added.
This is a large change so please see the appropriate sections of the
manual for full details. Briefly, syntax like this:
TARGET: VARIABLE = VALUE
defines VARIABLE as VALUE within the context of TARGET. This is
similar to SunOS make's "TARGET := VARIABLE = VALUE" feature. Note
that the assignment may be of any type, not just recursive, and that
the override keyword is available.
COMPATIBILITY: This new syntax means that if you have any rules where
the first or second dependency has an equal sign (=) in its name,
you'll have to escape them with a backslash: "foo : bar\=baz".
Further, if you have any dependencies which already contain "\=",
you'll have to escape both of them: "foo : bar\\\=baz".
* A new appendix listing the most common error and warning messages
generated by GNU make, with some explanation, has been added to the
GNU make User's Manual.
* Updates to the GNU make Customs library support (see README.customs).
* Updates to the Windows 95/NT port from Rob Tulloh (see README.W32),
and to the DOS port from Eli Zaretski (see README.DOS).
Version 3.76.1 (19 Sep 1997)
* Small (but serious) bug fix. Quick rollout to get into the GNU source CD.
Version 3.76 (16 Sep 1997)
* GNU make now uses automake to control Makefile.in generation. This
should make it more consistent with the GNU standards.
* VPATH functionality has been changed to incorporate the VPATH+ patch,
previously maintained by Paul Smith <psmith@baynetworks.com>. See the
manual.
* Make defines a new variable, `MAKECMDGOALS', to contain the goals that
were specified on the command line, if any. Modifying this variable
has no effect on the operation of make.
* A new function, `$(wordlist S,E,TEXT)', is available: it returns a
list of words from number S to number E (inclusive) of TEXT.
* Instead of an error, detection of future modification times gives a
warning and continues. The warning is repeated just before GNU make
exits, so it is less likely to be lost.
* Fix the $(basename) and $(suffix) functions so they only operate on
the last filename, not the entire string:
Command Old Result New Result
------- ---------- ----------
$(basename a.b) a a
$(basename a.b/c) a a.b/c
$(suffix a.b) b b
$(suffix a.b/c) b/c <empty>
* The $(strip) function now removes newlines as well as TABs and spaces.
* The $(shell) function now changes CRLF (\r\n) pairs to a space as well
as newlines (\n).
* Updates to the Windows 95/NT port from Rob Tulloh (see README.W32).
* Eli Zaretskii has updated the port to 32-bit protected mode on MSDOS
and MS-Windows, building with the DJGPP v2 port of GNU C/C++ compiler
and utilities. See README.DOS for details, and direct all questions
concerning this port to Eli Zaretskii <eliz@is.elta.co.il> or DJ
Delorie <dj@delorie.com>.
* John W. Eaton has updated the VMS port to support libraries and VPATH.
Version 3.75 (27 Aug 1996)
* The directory messages printed by `-w' and implicitly in sub-makes,
are now omitted if Make runs no commands and has no other messages to print.
* Make now detects files that for whatever reason have modification times
in the future and gives an error. Files with such impossible timestamps
can result from unsynchronized clocks, or archived distributions
containing bogus timestamps; they confuse Make's dependency engine
thoroughly.
* The new directive `sinclude' is now recognized as another name for
`-include', for compatibility with some other Makes.
* Aaron Digulla has contributed a port to AmigaDOS. See README.Amiga for
details, and direct all Amiga-related questions to <digulla@fh-konstanz.de>.
* Rob Tulloh of Tivoli Systems has contributed a port to Windows NT or 95.
See README.W32 for details, and direct all Windows-related questions to
<rob_tulloh@tivoli.com>.
Version 3.73 (05 Apr 1995)
* Converted to use Autoconf version 2, so `configure' has some new options.
See INSTALL for details.
* You can now send a SIGUSR1 signal to Make to toggle printing of debugging
output enabled by -d, at any time during the run.
Version 3.72 (04 Nov 1994)
* DJ Delorie has ported Make to MS-DOS using the GO32 extender.
He is maintaining the DOS port, not the GNU Make maintainer;
please direct bugs and questions for DOS to <djgpp@sun.soe.clarkson.edu>.
MS-DOS binaries are available for FTP from ftp.simtel.net in
/pub/simtelnet/gnu/djgpp/.
* The `MAKEFLAGS' variable (in the environment or in a makefile) can now
contain variable definitions itself; these are treated just like
command line variable definitions. Make will automatically insert any
variable definitions from the environment value of `MAKEFLAGS' or from
the command line, into the `MAKEFLAGS' value exported to children. The
`MAKEOVERRIDES' variable previously included in the value of `$(MAKE)'
for sub-makes is now included in `MAKEFLAGS' instead. As before, you can
reset `MAKEOVERRIDES' in your makefile to avoid putting all the variables
in the environment when its size is limited.
* If `.DELETE_ON_ERROR' appears as a target, Make will delete the target of
a rule if it has changed when its recipe exits with a nonzero status,
just as when the recipe gets a signal.
* The automatic variable `$+' is new. It lists all the dependencies like
`$^', but preserves duplicates listed in the makefile. This is useful
for linking rules, where library files sometimes need to be listed twice
in the link order.
* You can now specify the `.IGNORE' and `.SILENT' special targets with
dependencies to limit their effects to those files. If a file appears as
a dependency of `.IGNORE', then errors will be ignored while running the
recipe to update that file. Likewise if a file appears as a dependency
of `.SILENT', then the recipe to update that file will not be printed
before it is run. (This change was made to conform to POSIX.2.)
Version 3.71 (21 May 1994)
* The automatic variables `$(@D)', `$(%D)', `$(*D)', `$(<D)', `$(?D)', and
`$(^D)' now omit the trailing slash from the directory name. (This change
was made to comply with POSIX.2.)
* The source distribution now includes the Info files for the Make manual.
There is no longer a separate distribution containing Info and DVI files.
* You can now set the variables `binprefix' and/or `manprefix' in
Makefile.in (or on the command line when installing) to install GNU make
under a name other than `make' (i.e., ``make binprefix=g install''
installs GNU make as `gmake').
* The built-in Texinfo rules use the new variables `TEXI2DVI_FLAGS' for
flags to the `texi2dvi' script, and `MAKEINFO_FLAGS' for flags to the
Makeinfo program.
* The exit status of Make when it runs into errors is now 2 instead of 1.
The exit status is 1 only when using -q and some target is not up to date.
(This change was made to comply with POSIX.2.)
Version 3.70 (03 Jan 1994)
* It is no longer a fatal error to have a NUL character in a makefile.
You should never put a NUL in a makefile because it can have strange
results, but otherwise empty lines full of NULs (such as produced by
the `xmkmf' program) will always work fine.
* The error messages for nonexistent included makefiles now refer to the
makefile name and line number where the `include' appeared, so Emacs's
C-x ` command takes you there (in case it's a typo you need to fix).
Version 3.69 (07 Nov 1993)
* Implicit rule search for archive member references is now done in the
opposite order from previous versions: the whole target name `LIB(MEM)'
first, and just the member name and parentheses `(MEM)' second.
* Make now gives an error for an unterminated variable or function reference.
For example, `$(foo' with no matching `)' or `${bar' with no matching `}'.
* The new default variable `MAKE_VERSION' gives the version number of
Make, and a string describing the remote job support compiled in (if any).
Thus the value (in this release) is something like `3.69' or `3.69-Customs'.
* Commands in an invocation of the `shell' function are no longer run
with a modified environment like recipes are. As in versions before
3.68, they now run with the environment that `make' started with. We
have reversed the change made in version 3.68 because it turned out to
cause a paradoxical situation in cases like:
export variable = $(shell echo value)
When Make attempted to put this variable in the environment for a
recipe, it would try expand the value by running the shell command
`echo value'. In version 3.68, because it constructed an environment
for that shell command in the same way, Make would begin to go into an
infinite loop and then get a fatal error when it detected the loop.
* The recipe given for `.DEFAULT' is now used for phony targets with no
recipe.
Version 3.68 (28 Jul 1993)
* You can list several archive member names inside parenthesis:
`lib(mem1 mem2 mem3)' is equivalent to `lib(mem1) lib(mem2) lib(mem3)'.
* You can use wildcards inside archive member references. For example,
`lib(*.o)' expands to all existing members of `lib' whose names end in
`.o' (e.g. `lib(a.o) lib(b.o)'); `*.a(*.o)' expands to all such members
of all existing files whose names end in `.a' (e.g. `foo.a(a.o)
foo.a(b.o) bar.a(c.o) bar.a(d.o)'.
* A suffix rule `.X.a' now produces two pattern rules:
(%.o): %.X # Previous versions produced only this.
%.a: %.X # Now produces this as well, just like other suffixes.
* The new flag `--warn-undefined-variables' says to issue a warning message
whenever Make expands a reference to an undefined variable.
* The new `-include' directive is just like `include' except that there is
no error (not even a warning) for a nonexistent makefile.
* Commands in an invocation of the `shell' function are now run with a
modified environment like recipes are, so you can use `export' et al
to set up variables for them. They used to run with the environment
that `make' started with.
Version 3.66 (21 May 1993)
* `make --version' (or `make -v') now exits immediately after printing
the version number.
Version 3.65 (09 May 1993)
* Make now supports long-named members in `ar' archive files.
Version 3.64 (21 Apr 1993)
* Make now supports the `+=' syntax for a variable definition which appends
to the variable's previous value. See the section `Appending More Text
to Variables' in the manual for full details.
* The new option `--no-print-directory' inhibits the `-w' or
`--print-directory' feature. Make turns on `--print-directory'
automatically if you use `-C' or `--directory', and in sub-makes; some
users have found this behavior undesirable.
* The built-in implicit rules now support the alternative extension
`.txinfo' for Texinfo files, just like `.texinfo' and `.texi'.
Version 3.63 (22 Jan 1993)
* Make now uses a standard GNU `configure' script. See the new file
INSTALL for the new (and much simpler) installation procedure.
* There is now a shell script to build Make the first time, if you have no
other `make' program. `build.sh' is created by `configure'; see README.
* GNU Make now completely conforms to the POSIX.2 specification for `make'.
* Elements of the `$^' and `$?' automatic variables that are archive
member references now list only the member name, as in Unix and POSIX.2.
* You should no longer ever need to specify the `-w' switch, which prints
the current directory before and after Make runs. The `-C' switch to
change directory, and recursive use of Make, now set `-w' automatically.
* Multiple double-colon rules for the same target will no longer have their
recipes run simultaneously under -j, as this could result in the two
recipes trying to change the file at the same time and interfering with
one another.
* The `SHELL' variable is now never taken from the environment.
Each makefile that wants a shell other than the default (/bin/sh) must
set SHELL itself. SHELL is always exported to child processes.
This change was made for compatibility with POSIX.2.
* Make now accepts long options. There is now an informative usage message
that tells you what all the options are and what they do. Try `make --help'.
* There are two new directives: `export' and `unexport'. All variables are
no longer automatically put into the environments of the recipe lines that
Make runs. Instead, only variables specified on the command line or in
the environment are exported by default. To export others, use:
export VARIABLE
or you can define variables with:
export VARIABLE = VALUE
or:
export VARIABLE := VALUE
You can use just:
export
or:
.EXPORT_ALL_VARIABLES:
to get the old behavior. See the node `Variables/Recursion' in the manual
for a full description.
* The recipe from the `.DEFAULT' special target is only applied to
targets which have no rules at all, not all targets with no recipe.
This change was made for compatibility with Unix make.
* All fatal error messages now contain `***', so they are easy to find in
compilation logs.
* Dependency file names like `-lNAME' are now replaced with the actual file
name found, as with files found by normal directory search (VPATH).
The library file `libNAME.a' may now be found in the current directory,
which is checked before VPATH; the standard set of directories (/lib,
/usr/lib, /usr/local/lib) is now checked last.
See the node `Libraries/Search' in the manual for full details.
* A single `include' directive can now specify more than one makefile to
include, like this:
include file1 file2
You can also use shell file name patterns in an `include' directive:
include *.mk
* The default directories to search for included makefiles, and for
libraries specified with `-lNAME', are now set by configuration.
* You can now use blanks as well as colons to separate the directories in a
search path for the `vpath' directive or the `VPATH' variable.
* You can now use variables and functions in the left hand side of a
variable assignment, as in "$(foo)bar = value".
* The `MAKE' variable is always defined as `$(MAKE_COMMAND) $(MAKEOVERRIDES)'.
The `MAKE_COMMAND' variable is now defined to the name with which make
was invoked.
* The built-in rules for C++ compilation now use the variables `$(CXX)' and
`$(CXXFLAGS)' instead of `$(C++)' and `$(C++FLAGS)'. The old names had
problems with shells that cannot have `+' in environment variable names.
* The value of a recursively expanded variable is now expanded when putting
it into the environment for child processes. This change was made for
compatibility with Unix make.
* A rule with no targets before the `:' is now accepted and ignored.
This change was made for compatibility with SunOS 4 make.
We do not recommend that you write your makefiles to take advantage of this.
* The `-I' switch can now be used in MAKEFLAGS, and are put there
automatically just like other switches.
Version 3.61
* Built-in rules for C++ source files with the `.C' suffix.
We still recommend that you use `.cc' instead.
* If a recipe is given too many times for a single target, the last one
given is used, and a warning message is printed.
* Error messages about makefiles are in standard GNU error format,
so C-x ` in Emacs works on them.
* Dependencies of pattern rules which contain no % need not actually exist
if they can be created (just like dependencies which do have a %).
Version 3.60
* A message is always printed when Make decides there is nothing to be done.
It used to be that no message was printed for top-level phony targets
(because "`phony' is up to date" isn't quite right). Now a different
message "Nothing to be done for `phony'" is printed in that case.
* Archives on AIX now supposedly work.
* When the recipes specified for .DEFAULT are used to update a target,
the $< automatic variable is given the same value as $@ for that target.
This is how Unix make behaves, and this behavior is mandated by POSIX.2.
Version 3.59
* The -n, -q, and -t options are not put in the `MAKEFLAGS' and `MFLAG'
variables while remaking makefiles, so recursive makes done while remaking
makefiles will behave properly.
* If the special target `.NOEXPORT' is specified in a makefile,
only variables that came from the environment and variables
defined on the command line are exported.
Version 3.58
* Suffix rules may have dependencies (which are ignored).
Version 3.57
* Dependencies of the form `-lLIB' are searched for as /usr/local/lib/libLIB.a
as well as libLIB.a in /usr/lib, /lib, the current directory, and VPATH.
Version 3.55
* There is now a Unix man page for GNU Make. It is certainly not a
replacement for the Texinfo manual, but it documents the basic
functionality and the switches. For full documentation, you should
still read the Texinfo manual. Thanks to Dennis Morse of Stanford
University for contributing the initial version of this.
* Variables which are defined by default (e.g., `CC') will no longer be
put into the environment for child processes. (If these variables are
reset by the environment, makefiles, or the command line, they will
still go into the environment.)
* Makefiles which have recipes but no dependencies (and thus are always
considered out of date and in need of remaking), will not be remade (if they
were being remade only because they were makefiles). This means that GNU
Make will no longer go into an infinite loop when fed the makefiles that
`imake' (necessary to build X Windows) produces.
* There is no longer a warning for using the `vpath' directive with an explicit
pathname (instead of a `%' pattern).
Version 3.51
* When removing intermediate files, only one `rm' command line is printed,
listing all file names.
* There are now automatic variables `$(^D)', `$(^F)', `$(?D)', and `$(?F)'.
These are the directory-only and file-only versions of `$^' and `$?'.
* Library dependencies given as `-lNAME' will use "libNAME.a" in the current
directory if it exists.
* The automatic variable `$($/)' is no longer defined.
* Leading `+' characters on a recipe line make that line be executed even
under -n, -t, or -q (as if the line contained `$(MAKE)').
* For recipe lines containing `$(MAKE)', `${MAKE}', or leading `+' characters,