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1993-03-01
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110 lines
Main changes since make 3.61:
* 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
commands run simultaneously under -j, as this could result in the two
commands 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 commands 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 commands from the `.DEFAULT' special target are only applied to
targets which have no rules at all, not all targets with no commands.
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.
Changes made to the normal make:
- configured not to use getgroups()
- configured not to use getloadaverage()
- changed to read both DOS and Unix-format makefiles properly
The only changes made were in read.c [fopen(x, "r") -> fopen(x, "rt")].
The configuration stuff was changed in the config.h produced by configure.
While this make works fine for me, under MiNT 0.96 and 0.99, I cannot
guarantee it to work under TOS. I also did not test the extended
functionality like doing several things in parallel. If this doesn't
work, you're on your own!
Comments, bug-reports, requests to:
Hildo Biersma
boender@dutiws.twi.tudelft.nl