Commit Graph

205 Commits

Author SHA1 Message Date
Paul Smith
87a5f98d24 [SV 102] Don't show unnecessary include file errors.
Delay the generation of error messages for included files until we
are sure that we can't rebuild that included file.
* dep.h (struct dep): Don't reuse "changed"; make a separate field
to keep "flags".  Get rid of dontcare and use the flag.
(struct goaldep): Create a new structure for goal prereqs
that tracks an errno value and the floc where the include happened.
Rework the structures to ensure they are supersets as expected.
In maintainer mode with GCC, use inline to get type checking.
* read.c (eval_makefile): Return a struct goaldep for the new
makefile.  Ensure errno is set properly to denote a failure.
(read_all_makefiles): Switch to goaldep and check errno.
(eval): Don't show included file errors; instead remember them.
* remake.c (update_goal_chain): Set global variables to the current
goaldep we're building, and the entire chain.
(show_goal_error): Check if the current failure is a consequence
of building an included makefile and if so print an error.
(complain): Call show_goal_error() on rule failure.
* job.c (child_error): Call show_goal_error() on child error.
* main.c (main): Switch from struct dep to goaldep.
* misc.c (free_dep_chain): Not used; make into a macro.
* tests/scripts/features/include: Update and include new tests.
* tests/scripts/options/dash-B, tests/scripts/options/dash-W,
tests/scripts/options/print-directory,
tests/scripts/variables/MAKE_RESTARTS: Update known-good-output.
2016-04-09 20:06:46 -04:00
Paul Smith
5bd7ad2b22 Preserve the real value of -jN in MAKEFLAGS using jobserver.
Previously if the jobserver was active, MAKEFLAGS would contain only
the -j option but not the number (not -j5 or whatever) so users
could not discover that value.  Allow that value to be provided in
MAKEFLAGS without error but still give warnings if -jN is provided
on the command line if the jobserver is already activated.

* NEWS: Discuss the new behavior.
* os.h, posixos.c, w32/w32os.c: Return success/failure from
jobserver_setup() and jobserver_parse_auth().
* main.c (main): Separate the command line storage of job slots (now
in arg_job_slots) from the control storage (in job_slots).  Make a
distinction between -jN flags read from MAKEFLAGS and those seen
on the command line: for the latter if the jobserver is enabled then
warn and disable it, as before.
* tests/scripts/features/jobserver: Add new testing.
2016-04-04 01:38:37 -04:00
Paul Smith
c9e6ab9ac7 Change --jobserver-fds to more generic --jobserver-auth.
* NEWS: Mention the change.
* main.c: Rename jobserver_fds variable to jobserver_auth and
--jobserver-fds option to --jobserver-auth.
* os.h, posixos.c, w32/w32os.c: Rename jobserver_parse_arg() and
jobserver_get_arg() to jobserver_parse_auth()/jobserver_get_auth().
2016-04-04 01:36:08 -04:00
Paul Smith
b4682cb479 * job.c (child_error): Combine file info with error message.
* tests/scripts/...: Update error message matches.
2016-03-20 14:23:22 -04:00
Paul Smith
e33f3d72bf [SV 46581] Pre-define .LOADED to avoid warnings.
* main.c (main): Pre-define .LOADED as a default-level variable.
* load.c (load_file): Set the value rather than append it.  Avoid
adding an extra initial whitespace.
* tests/scripts/features/load: Run with --warn-undefined-variables.
2016-03-13 03:02:00 -04:00
Paul Smith
14b2d7effb * job.c (exec_command): [SV 47365] Show error on exec failure. 2016-03-09 00:18:57 -05:00
Paul Smith
5f9d341160 * tests/scripts/features/archives: Handle deterministic archives.
Newer versions of binutils allow ar to be compiled to generate
"deterministic archives" by default: in this mode no timestamp
information is generated in the static archive, which utterly
breaks GNU make's archive updating capability.  Debian and Ubuntu
have turned this feature on by default in their distributions
which causes the regression tests to fail.

Update the regression tests to check for the availability of the
"U" option to ar which disables deterministic archives and allows
GNU make's archive support to work properly again.
2016-02-29 01:31:16 -05:00
Benedikt Morbach
3c487e7ed5 * tests/scripts/features/archives: [SV 43405] override AR variable.
Copyright-paperwork-exempt: yes
2014-10-20 01:45:09 -04:00
John Malmberg
18eb093f56 [SV 41758]: Fix archive support for VMS.
Upated to match change to run_make_tests and some future fixes to
make on VMS.

* arscan.c: Use ANSI compatible pragmas instead of VAX C extensions.
* tests/scripts/features/archives: Fix tests to use VMS rules and
answers when running on VMS and using DCL as a shell.
* tests/scripts/features/vpath3: Fix epected answer on test when
run on VMS.
* tests/scripts/vms/library: (New) Test the VMS library rules that
are not tested by existing tests.
2014-10-20 01:31:42 -04:00
Paul Smith
3712e8a819 * tests/scripts/features/load: Avoid unused variable warnings. 2014-09-30 09:32:41 -04:00
Paul Smith
621e9edfe9 * tests/config-flags.pm.in, tests/scripts/features/archives: [SV 43046]
Use the "ar" program detected by configure when running the test suite.
2014-09-07 20:14:26 -04:00
Paul Smith
9c8b68a905 * main.c (die): Close output_context AND make_sync.
die() can be invoked inside a separate output_context, if the
$(error ...) function is expanded as part of a recipe.
2014-01-12 10:54:29 -05:00
Paul Smith
f5f5adb62c * features/loadapi (test_expand): Allocate memory for the nul byte. 2013-11-24 04:08:30 -05:00
Paul Smith
107ab16bf6 [SV 40240] Use configure info to build load test shared libs
* tests/config-flags.pm.in: A new file containing variable assignments
for the test suite; these variables are set by configure to contain
the values detected there for compilers, flags, etc.
* tests/run_make_tests.pl: Require the config-flags.pm file
* tests/scripts/features/load, tests/scripts/features/loadapi: Use the
configure-provided values when building the shared test library.
* configure.ac: Replace tests/config-flags.pm.in
* Makefile.am: Make sure tests/config-flags.pm is up to date
2013-10-19 15:39:15 -04:00
Paul Smith
dc9ae5e017 [SV 39709] Fix some typos. 2013-10-09 01:53:55 -04:00
Paul Smith
b539908f73 Clean up some tests for use on Windows. 2013-10-05 19:30:48 -04:00
Paul Smith
2fb91e19a0 Sanitize the registered function interface.
Expand the characters which are legal in a function name, and check
the name for validity.  Create a type for the function pointer.
Convert the last argument from a boolean to flags, to allow for expansion.
2013-10-05 16:10:30 -04:00
Paul Smith
fd30db1290 [SV 31155] Parse order-only tokens in second expansion results. 2013-09-22 17:10:35 -04:00
Paul Smith
65931ce7a9 Regression test portability to Solaris. 2013-09-22 17:10:34 -04:00
Paul Smith
7e77685bc3 Portability enhancements for Mac OSX.
Don't dup stdout into stderr in the test suite.
Don't rely on $port_type eq "UNIX" to mean case-preserving.
Check against the real output of ar when creating archives.
2013-09-22 17:09:46 -04:00
Paul Smith
300d1296fb Create a target that tests alternative configurations. 2013-09-21 18:10:08 -04:00
Paul Smith
822f8dae41 Remove obsolete tests. 2013-09-21 17:41:11 -04:00
Paul Smith
6c3e88e60f Ensure that output generated while reading makefiles is synced. 2013-09-21 17:24:59 -04:00
Paul Smith
9cd01958da Ensure that stderr from shell functions in recipes is synced. 2013-09-21 17:08:42 -04:00
Paul Smith
a4d8444b59 [SV 39934] Verify jobserver FDs before something else uses them. 2013-09-15 15:21:33 -04:00
Paul Smith
c5bfa40044 Support the -Orecurse option properly.
In this mode we still collect all the output from a given target and
dump it at once.  However we don't treat recursive lines any differently
from non-recursive lines.  Also we don't print enter/leave messages
after every dump.  However we do ensure that we always print them once
to stdout, so the parent make will collect it properly.
2013-09-14 01:04:04 -04:00
Paul Smith
deff9dacc9 Enhance the output sync mode.
Create a new file, output.c, and collect functions that generate output there.
We introduce a new global context specifying where output should go (to stdout
or to a sync file), and the lowest level output generator chooses where to
write output based on that context.

This allows us to set the context globally, and all operations that write
output (including functions like $(info ...) etc.) will use it.

Removed the "--trace=dir" capability.  It was too confusing.  If you have
directory tracking enabled then output sync will print the enter/leave message
for each synchronized block.  If you don't want that, disable directory
tracking.
2013-09-12 04:07:52 -04:00
Paul Smith
40a49f244d [Bug #39310] Parse simple pattern prereqs for globbing.
We tried to get some efficiency by avoiding a parse_file_seq() for simple
pattern prerequisites, but this also means no wildcard expansion was
happening, so add it back.  Add regression tests for wildcards in target and
prerequisite lists.
2013-07-22 02:23:02 -04:00
Paul Smith
5601726151 Keep a local count of the max dependency list size.
This global variable could be modified during recursion so keep our
own local copy to compare against.
2013-07-09 19:14:40 -04:00
Paul Smith
dc922e3f4c [SV #38442] Add library names to the string cache. 2013-05-26 16:53:17 -04:00
Paul Smith
c21c1455fd Add requirement for plugin_is_GPL_compatible symbol in loaded objects. 2013-05-14 22:53:42 -04:00
Paul Smith
381baeef7a Add new --trace[=MODE] flags, with --trace=dir
This mode replaces the previous heuristic setting enabled with -O, where we
would log directory enter/leave for each synchronized output.  Now we only
do that if --trace=dir is given.
2013-05-13 01:30:24 -04:00
Paul Smith
15f7957939 Rename the -O "job" mode to "line" and "make" to "recurse". 2013-05-05 20:19:00 -04:00
Paul Smith
1d992d8fe7 Ensure command lines are written synchronously with -O.
If output-sync is enabled, have make write the command line to the temp file
instead of printing it directly to the screen to ensure that the output is
ordered properly.  Also, remove extraneous enter/leave operations by having
them printed directly when dumping temp file output.
2013-05-05 17:03:51 -04:00
Paul Smith
3484c9675a Add memory allocation cleanup to loadable objects.
Add gmk_alloc() and gmk_free() functions so loadable objects can access our
memory model.  Also provide a more extensive example in the manual.
2013-05-04 17:38:53 -04:00
Paul Smith
b8467292c9 Improve sync handling for -Ojob/-Otarget and recursion.
If we are not going to sync a command line then dump any collected output
first to preserve ordering.  Do some code cleanup:
  * Move the handle init to a separate function.
  * Move the temp file truncation to the output function.
  * Remember whether we sync in a variable for readability.
  * Handle EINTR and short writes in child_out().
  * Always call sync_output() in case output_sync was changed due to error.
2013-05-04 13:10:56 -04:00
Eli Zaretskii
a66469e003 Fix interfacing with and remaking dynamic objects on MS-Windows.
load.c (load_object, load_file): Accept an additional argument
 DLP and return in it a pointer that can be used to unload the
 dynamic object.
 read.c (eval): Call load_file with an additional argument, and
 record the pointer returned there in the 'struct file' object of
 dynamic objects in that object's 'struct file'.
 commands.c (execute_file_commands): Unload dynamic objects
 before remaking them, to avoid failure to remake if the OS doesn't
 allow overwriting objects that are in use.
 filedef.h (struct file): New member dlopen_ptr.
 gnumake.h (GMK_EXPORT): Define to dllexport/dllimport
 decorations for Windows and to nothing on other platforms.
 (gmk_eval, gmk_expand, gmk_add_function): Add GMK_EXPORT qualifier
 to prototypes.
 makeint.h (MAIN): Define before including gnumake.h, to give
 correct dllexport decorations to exported functions.
 (load_file): Adjust prototype.
 loadapi.c: Don't include gnumake.h, since makeint.h already
 includes it, and takes care of defining MAIN before doing so.
 build_w32.bat (LinkGCC): Produce an import library for functions
 exported by Make for loadable dynamic objects.

 w32/compat/posixfcn.c (dlclose): New function.
 w32/include/dlfcn.h (dlclose): Add prototype.

 scripts/features/load: Fix signatures of testload_gmk_setup and
 explicit_setup, to bring them in line with the documentation.
2013-05-03 16:09:12 +03:00
Paul Smith
f88eb23b02 Ensure error messages are printed with sync'd output.
Enhance the child_error() function so that it will write error output to the
child's sync output buffer, if it exists.  If it doesn't the output goes to
stdout/stderr.
2013-04-28 19:09:20 -04:00
Paul Smith
8b034b7d18 Small cleanups and fixes. 2013-04-28 17:31:46 -04:00
Paul Smith
7f01830927 Add support for per-job output sync.
A new flag to the -O/--output-sync, "job", selects a per-job (that is, per
line of a recipe) output synchronization.  To support this move the close of
the temp file out of the sync_output() function and don't do it until we free
the child, since we may call sync_output() multiple times in a given recipe.
When we set up for a new temp file, if we're in per-job mode we truncate the
file and seek to the beginning to re-use it for every job.
2013-04-28 01:19:19 -04:00
Paul Smith
2bd957a89d Change the arg option for -O from numeric to string. 2013-04-15 13:22:51 -04:00
Paul Smith
7f7e6f80c5 Modify output-sync tests to be more reliable. 2013-04-15 10:33:42 -04:00
Paul Smith
4bf3c33f83 Rename the "parallel-sync" option to "output-sync". 2013-04-14 16:31:18 -04:00
Frank Heckenbach
cb64352c75 Initial patch for output synchronization. See Savannah bug #33138.
Based on work by David Boyce <David.S.Boyce@gmail.com>.
2013-04-14 15:38:07 -04:00
Paul Smith
5058a94ee7 Expand the loadable object support.
Provide a simple API for loaded objects to interact with GNU make.  I still
won't guarantee that this API won't change but it's much closer to something
that's supported and provides easy-to-use interfaces with a public header
file.
2013-02-25 01:38:36 -05:00
Paul Smith
b70aa3709e Allow dynamically loaded objects to be rebuilt by make. 2013-01-20 00:55:57 -05:00
Paul Smith
6ca41d9b17 [SV #37878] Add a check for targets with parens that are not archives. 2013-01-13 12:40:13 -05:00
Paul Smith
1d298acf9d Ensure parallel test works properly. 2013-01-12 21:54:41 -05:00
Paul Smith
7670c84f77 Implement new "load" directive.
Provides support for dynamically loadable objects in GNU make, as a
"technology preview".
2012-10-29 07:05:21 +00:00
Paul Smith
ca8885d5be Remove extraneous close(). 2012-10-28 14:56:28 +00:00
Paul Smith
fbe5b2c9cd Force intermediate targets to be considered if their non-intermediate
parent needs to be remade.  Fixes Savannah bug #30653.
2012-09-10 02:36:05 +00:00
Paul Smith
7d3743dfdc Verify that backslashes before non-special characters are preserved. 2012-09-09 22:37:13 +00:00
Paul Smith
bc578b6c8e Ignore UTF-8 BOMs. See Savannah bug #36529. 2012-09-09 21:11:00 +00:00
Paul Smith
cf1c79c9a3 Improve handling for escaped colons in prerequisite lists.
Fixes Savannah bug #12126 and bug #16545
2012-03-04 16:53:50 +00:00
Paul Smith
23c2b99e9d Convert all "`'" quotes to "''" per new GNU Coding Standard guidelines.
Fixes Savannah bug #34530.
2012-03-04 00:24:20 +00:00
Paul Smith
4f47fbf953 Be sure to start parsing prereqs in the right place even if there are
escape characters (backslashes) in the target name.
See Savannah bug #33399
2011-11-14 07:31:06 +00:00
Paul Smith
d472624f33 When we re-exec the master makefile in a jobserver environment, ensure
that MAKEFLAGS is set properly so the re-exec'd make runs in parallel.
See Savannah bug #33873.
2011-09-18 23:39:26 +00:00
Paul Smith
0369a93825 We compute various values for vpath lookup the first time through
and store them in static variables; however one value (std_dirs)
was not being stored statically so the second time through it was
not set.
Fixes Savannah bug #32511
2011-09-18 20:52:13 +00:00
Paul Smith
e4d5d43424 Save strings we're expanding in case an embedded eval causes them
to be freed (if they're the value of a variable that's reset for example).
See Savannah patch #7534
2011-08-29 16:20:19 +00:00
Paul Smith
b06b8c64a2 Fix another error related to whitespace handling in archives.
Newer version of VMS support strncasecmp() so update the config.h.
2011-06-12 16:22:04 +00:00
Paul Smith
b34438bee8 Add new feature: != shell assignment for portability with BSD make.
Feature submitted by David Wheeler.
2011-04-18 01:25:20 +00:00
Paul Smith
ae2ab76fac Check if the target-specific variable is the same as the global
variable, and if so don't try to update it.  Savannah bug #31743.
2010-11-30 14:48:52 +00:00
Paul Smith
391456aad7 Improve backslash/newline handling to adhere to POSIX requirements. 2010-11-06 21:56:23 +00:00
Paul Smith
a86d1693ba Bump the version to 3.82.90.
Fix some doc bugs.
Implement the --trace flag.
Show filename/linenumber on error.
2010-08-29 23:05:26 +00:00
Paul Smith
5acda13ace - Fix the NEWS file to be accurate
- Add oneshell to $(.FEATURES) (forgot that!)
- Fix Savannah bug #30612: handling of archive references with >1 object
2010-08-14 02:50:14 +00:00
Paul Smith
036760a9fd Fix Savannah bug #30723: expand MAKEFLAGS before we re-exec after
rebuilding makefiles.
2010-08-10 07:35:34 +00:00
Paul Smith
c78b7265bd Fixups for warnings on Windows (esp 64bit). 2010-07-05 18:32:03 +00:00
Paul Smith
97f106fa10 - Add whitespace to command line invocation in features/recursion
- Set up .FEATURES with separate calls for optional features, as some
  compilers don't like conditionals inside macro invocations.
2010-07-01 07:16:00 +00:00
Boris Kolpackov
fe43fa9de3 Implement linker-compatible library search. 2009-11-12 16:42:36 +00:00
Boris Kolpackov
bd2d124f27 Fix savannah bug 25780. Optimize things a bit. 2009-10-06 12:36:29 +00:00
Paul Smith
acbdc33e1c Add a test for another (still open) bug. 2009-10-04 19:18:16 +00:00
Paul Smith
f87715a62c - Include <alloca.h> even on non-__GNUC__ systems.
- Add some tests for unresolved bugs.
2009-10-03 20:08:20 +00:00
Boris Kolpackov
56653d8524 Fix Savannah bugs #15110, #25493, #12686, and #17740. 2009-09-30 09:54:26 +00:00
Paul Smith
f907a4d90c - Update manual description for pattern rule search algorithm
- Add new "-all" flag to the test suite to run tests that don't pass yet
- Add some non-passing tests
- Fix from Andreas Buening for OS/2.
2009-09-28 23:08:49 +00:00
Boris Kolpackov
f5891a26d8 Implement the shortest stem first search order for pattern-specific variables and pattern rules. 2009-09-28 12:31:55 +00:00
Paul Smith
d65b267e4a - Fix broken handling of order-only prereqs in secondary expansion
of implicit rules.
- Fix leaked memory when dealing with implicit rule chains that
  have file variables or pattern variables.
2009-09-24 20:59:22 +00:00
Paul Smith
0afbbf8595 - Rework secondary expansion so we only defer it if there's a possibility
it might be needed: for most situations we parse prereqs immediately as
  we used to.  Reduces memory usage.
- Fixes Savannah bug #18622.
2009-09-24 02:41:44 +00:00
Paul Smith
be6b22a283 - Fix Savannah bug #13529 2009-06-14 06:08:11 +00:00
Paul Smith
c8840352ac - Fix Savannah bug #19108
- Fix Savannah bug #17752
- Test suite:
  * When tests fail keep a "run" file containing the command invoked.
  * Support for the Valgrind "memcheck" and "massif" tools.
2009-06-10 02:21:09 +00:00
Paul Smith
d4ee001292 - Fix Savannah bug #18124
- Fix Savannah bug #17521
- Fix Savannah bug #16401
- Fix Savannah bug #16469
- Fix Savannah bug #16473
2009-06-09 15:35:38 +00:00
Paul Smith
a72bff7cb3 - Fix Savannah bug #24622 2009-06-07 18:16:15 +00:00
Paul Smith
81f3e4babd - Modify access of config and gnulib Savannah modules to use GIT
- Fix Savannah bug #24655.
- Fix Savannah bug #24588.
- Fix Savannah bug #24277.
- Fix Savannah bug #25697.
- Fix Savannah bug #25694.
- Fix Savannah bug #25460.
- Fix Savannah bug #26207.
- Fix Savannah bug #25712.
- Fix Savannah bug #26593.
- Fix various doc issues.
2009-06-04 06:30:27 +00:00
Paul Smith
5b4d419476 Add 'private' variable modifier, feature submitted by Ramon Garcia.
Rework the parser for variables to allow multiple modifiers and also
allow for variables and targets with modifier names, like "export" and
"private".
2009-05-26 01:31:40 +00:00
Paul Smith
19b6504f8a Incorporate Icarus Sparry's fix for 3330 and 15919, and test cases.
One of our translations disappeared from the translations site so remove it.

The fdl.texi file was changed to not contain any @node entries, so add some
around it in make.texi.
2007-08-15 13:53:53 +00:00
Paul Smith
bb4d040fad Fix Savannah bug #20452.
Add a new feature to the test suite suggested by Icarus Sparry:
set a timer before invoking a test, so that if it loops infinitely we
will wake up and have a chance to kill the process and continue.
2007-07-14 02:57:46 +00:00
Paul Smith
6ccf33cdbd This is a major update, which switches virtually every allocated-but-not-freed
string into the strcache.  As a side-effect, many more structure members and
function arguments can/should be declared const.

As mentioned in the changelog, unfortunately measurement shows that this
change does not yet reduce memory.  The problem is with secondary expansion:
because of this we store all the prerequisites in the string cache twice.
First we store the prerequisite string after initial expansion but before
secondary expansion, then we store each individual file after secondary
expansion and expand_deps().  I plan to change expand_deps() to be callable
in either context (eval or snap_deps) then have non-second-expansion
targets call expand_deps() during eval, so that we only need to store that
dependency list once.
2007-03-20 03:02:26 +00:00
Paul Smith
a8f101d0bc Release GNU make 3.81.
Update NEWS docs.
Enhance the manual to use automake version.texi, and use the canonical
FSF copyright features and statement.
Some $(realpath ...) tests won't work on Windows; leave them out
The jobserver filedescriptor test might fail if some FDs are reserved,
so for now comment out that check.
2006-04-01 06:36:40 +00:00
Paul Smith
94aead216e Minor fixes before the rc2 release. 2006-03-20 03:03:04 +00:00
Paul Smith
24aac7f8f6 Add some alloca(0) calls for systems without "normal" alloca support.
Fix a file descriptor leak with make re-exec while using the jobserver.
Update some release information.
2006-03-20 02:36:36 +00:00
Boris Kolpackov
22886f8a74 Fixed Savannah bug #16053. 2006-03-17 14:24:20 +00:00
Paul Smith
50eb3cf5e5 Fix Savannah bug #15913. 2006-03-15 03:31:30 +00:00
Paul Smith
6d8d9b74d9 Numerous updates to tests for issues found on Cygwin and Windows.
Revert a fix for $? including non-existent files as it shows a bug
in the Linux kernel build.  Give them a release to fix this.
Add some changes from Eli Z. for Windows changes.
2006-03-10 02:20:45 +00:00
Paul Smith
afc4906aca Some test updates for Windows.
Handle SHELL set on the command line properly for windows.
2006-03-08 20:15:08 +00:00
Paul Smith
bde826b18a Make sure we don't introduce a circularity into the variable set linked
list.  Fixes Savannah bug #15757.
2006-02-17 13:29:52 +00:00
Boris Kolpackov
d0c4e92f11 Fixed Savannah bug #15641. 2006-02-08 17:29:07 +00:00
Paul Smith
4bd6db9df1 Update the make.1 man page.
Use rm -f instead of rm in the test scripts.  Fixes bug #15085.
2005-12-13 14:44:17 +00:00
Paul Smith
3bcb608bda Extend .SECONDEXPANSION to implicit rules. Final fix for bug #13781. 2005-12-11 15:41:17 +00:00
Boris Kolpackov
0e6c4f5b0e Fixed bug #13022 by setting is_target flag on files that this implicit
pattern rule also makes.
2005-12-09 16:46:19 +00:00
Boris Kolpackov
a34b85490d Fixed bug #14334 by propagate the change of modification time to all the
double-colon entries only if it is the last one to be updated.
2005-12-07 11:33:38 +00:00
Paul Smith
11095a90f1 Make second expansion optional (partial implementation).
I decided this feature was too impacting to make the permanent default
behavior.  This set of changes makes the default behavior of make the
old behavior (no second expansion).  If you want second expansion, you
must define the .SECONDEXPANSION: special target before the first target
that needs it.

This set of changes ONLY fixes explicit and static pattern rules to work
like this.  Implicit rules still have second expansion enabled all the
time: I'll work on that next.

Note that there is still a backward-incompatibility: now to get the old
SysV behavior using $$@ etc. in the prerequisites list you need to set
.SECONDEXPANSION: as well.
2005-10-24 13:01:39 +00:00