/* Basic dependency engine for GNU Make.
Copyright (C) 1988-2016 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3 of the License, or (at your option) any later
version.
GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see . */
#include "makeint.h"
#include "filedef.h"
#include "job.h"
#include "commands.h"
#include "dep.h"
#include "variable.h"
#include "debug.h"
#include
#ifdef HAVE_FCNTL_H
#include
#else
#include
#endif
#ifdef VMS
#include
#endif
#ifdef WINDOWS32
#include
#endif
/* The test for circular dependencies is based on the 'updating' bit in
'struct file'. However, double colon targets have separate 'struct
file's; make sure we always use the base of the double colon chain. */
#define start_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
->updating = 1)
#define finish_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
->updating = 0)
#define is_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
->updating)
/* Incremented when a command is started (under -n, when one would be). */
unsigned int commands_started = 0;
/* Set to the goal dependency. Mostly needed for remaking makefiles. */
static struct goaldep *goal_list;
static struct dep *goal_dep;
/* Current value for pruning the scan of the goal chain.
All files start with considered == 0. */
static unsigned int considered = 0;
static enum update_status update_file (struct file *file, unsigned int depth);
static enum update_status update_file_1 (struct file *file, unsigned int depth);
static enum update_status check_dep (struct file *file, unsigned int depth,
FILE_TIMESTAMP this_mtime, int *must_make);
static enum update_status touch_file (struct file *file);
static void remake_file (struct file *file);
static FILE_TIMESTAMP name_mtime (const char *name);
static const char *library_search (const char *lib, FILE_TIMESTAMP *mtime_ptr);
#ifdef CONFIG_WITH_DOT_MUST_MAKE
static int call_must_make_target_var (struct file *file, unsigned int depth);
#endif
#ifdef CONFIG_WITH_DOT_IS_CHANGED
static int call_is_changed_target_var (struct file *file);
#endif
/* Remake all the goals in the 'struct dep' chain GOALS. Return -1 if nothing
was done, 0 if all goals were updated successfully, or 1 if a goal failed.
If rebuilding_makefiles is nonzero, these goals are makefiles, so -t, -q,
and -n should be disabled for them unless they were also command-line
targets, and we should only make one goal at a time and return as soon as
one goal whose 'changed' member is nonzero is successfully made. */
enum update_status
update_goal_chain (struct goaldep *goaldeps)
{
int t = touch_flag, q = question_flag, n = just_print_flag;
enum update_status status = us_none;
/* Duplicate the chain so we can remove things from it. */
struct dep *goals = copy_dep_chain ((struct dep *)goaldeps);
goal_list = rebuilding_makefiles ? goaldeps : NULL;
#define MTIME(file) (rebuilding_makefiles ? file_mtime_no_search (file) \
: file_mtime (file))
/* Start a fresh batch of consideration. */
++considered;
/* Update all the goals until they are all finished. */
while (goals != 0)
{
register struct dep *g, *lastgoal;
/* Start jobs that are waiting for the load to go down. */
start_waiting_jobs ();
/* Wait for a child to die. */
reap_children (1, 0);
lastgoal = 0;
g = goals;
while (g != 0)
{
/* Iterate over all double-colon entries for this file. */
struct file *file;
int stop = 0, any_not_updated = 0;
goal_dep = g;
for (file = g->file->double_colon ? g->file->double_colon : g->file;
file != NULL;
file = file->prev)
{
unsigned int ocommands_started;
enum update_status fail;
file->dontcare = ANY_SET (g->flags, RM_DONTCARE);
check_renamed (file);
if (rebuilding_makefiles)
{
if (file->cmd_target)
{
touch_flag = t;
question_flag = q;
just_print_flag = n;
}
else
touch_flag = question_flag = just_print_flag = 0;
}
/* Save the old value of 'commands_started' so we can compare
later. It will be incremented when any commands are
actually run. */
ocommands_started = commands_started;
fail = update_file (file, rebuilding_makefiles ? 1 : 0);
check_renamed (file);
/* Set the goal's 'changed' flag if any commands were started
by calling update_file above. We check this flag below to
decide when to give an "up to date" diagnostic. */
if (commands_started > ocommands_started)
g->changed = 1;
stop = 0;
if ((fail || file->updated) && status < us_question)
{
/* We updated this goal. Update STATUS and decide whether
to stop. */
if (file->update_status)
{
/* Updating failed, or -q triggered. The STATUS value
tells our caller which. */
status = file->update_status;
/* If -q just triggered, stop immediately. It doesn't
matter how much more we run, since we already know
the answer to return. */
stop = (question_flag && !keep_going_flag
&& !rebuilding_makefiles);
}
else
{
FILE_TIMESTAMP mtime = MTIME (file);
check_renamed (file);
if (file->updated && g->changed &&
mtime != file->mtime_before_update)
{
/* Updating was done. If this is a makefile and
just_print_flag or question_flag is set (meaning
-n or -q was given and this file was specified
as a command-line target), don't change STATUS.
If STATUS is changed, we will get re-exec'd, and
enter an infinite loop. */
if (!rebuilding_makefiles
|| (!just_print_flag && !question_flag))
status = us_success;
if (rebuilding_makefiles && file->dontcare)
/* This is a default makefile; stop remaking. */
stop = 1;
}
}
}
/* Keep track if any double-colon entry is not finished.
When they are all finished, the goal is finished. */
any_not_updated |= !file->updated;
file->dontcare = 0;
if (stop)
break;
}
/* Reset FILE since it is null at the end of the loop. */
file = g->file;
if (stop || !any_not_updated)
{
/* If we have found nothing whatever to do for the goal,
print a message saying nothing needs doing. */
if (!rebuilding_makefiles
/* If the update_status is success, we updated successfully
or not at all. G->changed will have been set above if
any commands were actually started for this goal. */
&& file->update_status == us_success && !g->changed
/* Never give a message under -s or -q. */
&& !silent_flag && !question_flag)
OS (message, 1, ((file->phony || file->cmds == 0)
? _("Nothing to be done for '%s'.")
: _("'%s' is up to date.")),
file->name);
/* This goal is finished. Remove it from the chain. */
if (lastgoal == 0)
goals = g->next;
else
lastgoal->next = g->next;
/* Free the storage. */
#ifndef CONFIG_WITH_ALLOC_CACHES
free (g);
#else
free_dep (g);
#endif
g = lastgoal == 0 ? goals : lastgoal->next;
if (stop)
break;
}
else
{
lastgoal = g;
g = g->next;
}
}
/* If we reached the end of the dependency graph update CONSIDERED
for the next pass. */
if (g == 0)
++considered;
}
if (rebuilding_makefiles)
{
touch_flag = t;
question_flag = q;
just_print_flag = n;
}
return status;
}
/* If we're rebuilding an included makefile that failed, and we care
about errors, show an error message the first time. */
void
show_goal_error (void)
{
struct goaldep *goal;
if ((goal_dep->flags & (RM_INCLUDED|RM_DONTCARE)) != RM_INCLUDED)
return;
for (goal = goal_list; goal; goal = goal->next)
if (goal_dep->file == goal->file)
{
if (goal->error)
{
OSS (error, &goal->floc, "%s: %s",
goal->file->name, strerror ((int)goal->error));
goal->error = 0;
}
return;
}
}
/* If FILE is not up to date, execute the commands for it.
Return 0 if successful, non-0 if unsuccessful;
but with some flag settings, just call 'exit' if unsuccessful.
DEPTH is the depth in recursions of this function.
We increment it during the consideration of our dependencies,
then decrement it again after finding out whether this file
is out of date.
If there are multiple double-colon entries for FILE,
each is considered in turn. */
static enum update_status
update_file (struct file *file, unsigned int depth)
{
enum update_status status = us_success;
struct file *f;
f = file->double_colon ? file->double_colon : file;
/* Prune the dependency graph: if we've already been here on _this_
pass through the dependency graph, we don't have to go any further.
We won't reap_children until we start the next pass, so no state
change is possible below here until then. */
if (f->considered == considered)
{
/* Check for the case where a target has been tried and failed but
the diagnostics haven't been issued. If we need the diagnostics
then we will have to continue. */
if (!(f->updated && f->update_status > us_none
&& !f->dontcare && f->no_diag))
{
DBF (DB_VERBOSE, _("Pruning file '%s'.\n"));
return f->command_state == cs_finished ? f->update_status : us_success;
}
}
/* This loop runs until we start commands for a double colon rule, or until
the chain is exhausted. */
for (; f != 0; f = f->prev)
{
enum update_status new;
f->considered = considered;
new = update_file_1 (f, depth);
check_renamed (f);
/* Clean up any alloca() used during the update. */
alloca (0);
/* If we got an error, don't bother with double_colon etc. */
if (new && !keep_going_flag)
return new;
if (f->command_state == cs_running
|| f->command_state == cs_deps_running)
/* Don't run other :: rules for this target until
this rule is finished. */
return us_success;
if (new > status)
status = new;
}
/* Process the remaining rules in the double colon chain so they're marked
considered. Start their prerequisites, too. */
if (file->double_colon)
for (; f != 0 ; f = f->prev)
{
struct dep *d;
f->considered = considered;
for (d = f->deps; d != 0; d = d->next)
{
enum update_status new = update_file (d->file, depth + 1);
if (new > status)
status = new;
}
}
return status;
}
/* Show a message stating the target failed to build. */
static void
complain (struct file *file)
{
/* If this file has no_diag set then it means we tried to update it
before in the dontcare mode and failed. The target that actually
failed is not necessarily this file but could be one of its direct
or indirect dependencies. So traverse this file's dependencies and
find the one that actually caused the failure. */
struct dep *d;
for (d = file->deps; d != 0; d = d->next)
{
if (d->file->updated && d->file->update_status > us_none && file->no_diag)
{
complain (d->file);
break;
}
}
if (d == 0)
{
show_goal_error ();
/* Didn't find any dependencies to complain about. */
#ifdef KMK
/* jokes */
if (!keep_going_flag && file->parent == 0)
{
const char *msg_joke = 0;
extern struct dep *goals;
/* classics */
if (!strcmp (file->name, "fire")
|| !strcmp (file->name, "Fire"))
msg_joke = "No matches.\n";
else if (!strcmp (file->name, "love")
|| !strcmp (file->name, "Love")
|| !strcmp (file->name, "peace")
|| !strcmp (file->name, "Peace"))
msg_joke = "Not war.\n";
else if (!strcmp (file->name, "war"))
msg_joke = "Don't know how to make war.\n";
/* http://xkcd.com/149/ - GNU Make bug #23273. */
else if (( !strcmp (file->name, "me")
&& goals != 0
&& !strcmp (dep_name(goals), "me")
&& goals->next != 0
&& !strcmp (dep_name(goals->next), "a")
&& goals->next->next != 0)
|| !strncmp (file->name, "me a ", 5))
msg_joke =
# ifdef HAVE_UNISTD_H
getuid () == 0 ? "Okay.\n" :
# endif
"What? Make it yourself!\n";
if (msg_joke)
{
fputs (msg_joke, stderr);
die (2);
}
}
#endif /* KMK */
if (file->parent)
{
size_t l = strlen (file->name) + strlen (file->parent->name) + 4;
const char *m = _("%sNo rule to make target '%s', needed by '%s'%s");
if (!keep_going_flag)
fatal (NILF, l, m, "", file->name, file->parent->name, "");
error (NILF, l, m, "*** ", file->name, file->parent->name, ".");
}
else
{
size_t l = strlen (file->name) + 4;
const char *m = _("%sNo rule to make target '%s'%s");
if (!keep_going_flag)
fatal (NILF, l, m, "", file->name, "");
error (NILF, l, m, "*** ", file->name, ".");
}
file->no_diag = 0;
}
}
/* Consider a single 'struct file' and update it as appropriate.
Return 0 on success, or non-0 on failure. */
static enum update_status
update_file_1 (struct file *file, unsigned int depth)
{
enum update_status dep_status = us_success;
FILE_TIMESTAMP this_mtime;
int noexist, must_make, deps_changed;
struct file *ofile;
struct dep *d, *ad;
struct dep amake;
int running = 0;
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
struct file *org_file;
struct file *req_file;
struct file *f2, *f3;
/* Secondary target expansion leaves renamed files around, skip any rename
files to simplify multi target handling. */
check_renamed(file);
/* Remember the request file and find the primary multi target file. Always
work on the primary file in a multi target recipe. */
req_file = file;
org_file = file;
if (file->multi_head != NULL)
{
if (file->multi_head == file)
DBS (DB_VERBOSE, (_("Considering target file '%s' (multi head).\n"), file->name));
else
{
org_file = file = file->multi_head;
DBS (DB_VERBOSE, (_("Considering target file '%s' -> multi head '%s'.\n"),
req_file->name, file->name));
assert (file->multi_head == file);
}
}
else
#endif /* CONFIG_WITH_EXPLICIT_MULTITARGET */
DBF (DB_VERBOSE, _("Considering target file '%s'.\n"));
if (file->updated)
{
if (file->update_status > us_none)
{
DBF (DB_VERBOSE,
_("Recently tried and failed to update file '%s'.\n"));
/* If the file we tried to make is marked no_diag then no message
was printed about it when it failed during the makefile rebuild.
If we're trying to build it again in the normal rebuild, print a
message now. */
if (file->no_diag && !file->dontcare)
complain (file);
return file->update_status;
}
DBF (DB_VERBOSE, _("File '%s' was considered already.\n"));
return 0;
}
switch (file->command_state)
{
case cs_not_started:
case cs_deps_running:
break;
case cs_running:
DBF (DB_VERBOSE, _("Still updating file '%s'.\n"));
return 0;
case cs_finished:
DBF (DB_VERBOSE, _("Finished updating file '%s'.\n"));
return file->update_status;
default:
abort ();
}
/* Determine whether the diagnostics will be issued should this update
fail. */
file->no_diag = file->dontcare;
++depth;
/* Notice recursive update of the same file. */
start_updating (file);
/* We might change file if we find a different one via vpath;
remember this one to turn off updating. */
ofile = file;
/* Looking at the file's modtime beforehand allows the possibility
that its name may be changed by a VPATH search, and thus it may
not need an implicit rule. If this were not done, the file
might get implicit commands that apply to its initial name, only
to have that name replaced with another found by VPATH search.
For multi target files check the other files and use the time
of the oldest / non-existing file. */
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
this_mtime = file_mtime (file);
check_renamed (file);
f3 = file;
for (f2 = file->multi_next;
f2 != NULL && this_mtime != NONEXISTENT_MTIME;
f2 = f2->multi_next)
if (!f2->multi_maybe)
{
FILE_TIMESTAMP second_mtime = file_mtime (f2);
if (second_mtime < this_mtime)
{
this_mtime = second_mtime;
f3 = f2;
}
}
/** @todo this isn't sufficient, need to introduce a truly optional type and
* make |+ ignore mtime. let's hope that doesn't break too much... */
/* If the requested file doesn't exist, always do a remake in the
hope that it is recreated even if it's "maybe" target. */
else if (f2 == req_file && file_mtime (f2) == NONEXISTENT_MTIME)
{
this_mtime = NONEXISTENT_MTIME;
f3 = f2;
break;
}
check_renamed (f3);
noexist = this_mtime == NONEXISTENT_MTIME;
if (noexist)
DBS (DB_BASIC, (_("File '%s' does not exist.\n"), f3->name));
#else /* !CONFIG_WITH_EXPLICIT_MULTITARGET */
this_mtime = file_mtime (file);
check_renamed (file);
noexist = this_mtime == NONEXISTENT_MTIME;
if (noexist)
DBF (DB_BASIC, _("File '%s' does not exist.\n"));
#endif /* !CONFIG_WITH_EXPLICIT_MULTITARGET */
else if (ORDINARY_MTIME_MIN <= this_mtime && this_mtime <= ORDINARY_MTIME_MAX
&& file->low_resolution_time)
{
/* Avoid spurious rebuilds due to low resolution time stamps. */
int ns = FILE_TIMESTAMP_NS (this_mtime);
if (ns != 0)
OS (error, NILF,
_("*** Warning: .LOW_RESOLUTION_TIME file '%s' has a high resolution time stamp"),
file->name);
this_mtime += FILE_TIMESTAMPS_PER_S - 1 - ns;
}
must_make = noexist;
/* If file was specified as a target with no commands,
come up with some default commands. */
if (!file->phony && file->cmds == 0 && !file->tried_implicit)
{
if (try_implicit_rule (file, depth))
DBF (DB_IMPLICIT, _("Found an implicit rule for '%s'.\n"));
else
DBF (DB_IMPLICIT, _("No implicit rule found for '%s'.\n"));
file->tried_implicit = 1;
}
if (file->cmds == 0 && !file->is_target
&& default_file != 0 && default_file->cmds != 0)
{
DBF (DB_IMPLICIT, _("Using default recipe for '%s'.\n"));
file->cmds = default_file->cmds;
}
/* Update all non-intermediate files we depend on, if necessary, and see
whether any of them is more recent than this file. We need to walk our
deps, AND the deps of any also_make targets to ensure everything happens
in the correct order.
bird: For explicit multitarget rules we must iterate all the output
files to get the correct picture. The special .MUST_MAKE
target variable call is also done from this context. */
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
assert (file == org_file);
for (f2 = file; f2; file = f2 = f2->multi_next)
{
#endif
amake.file = file;
amake.next = file->also_make;
ad = &amake;
while (ad)
{
struct dep *lastd = 0;
/* Find the deps we're scanning */
d = ad->file->deps;
ad = ad->next;
while (d)
{
enum update_status new;
FILE_TIMESTAMP mtime;
int maybe_make;
int dontcare = 0;
check_renamed (d->file);
mtime = file_mtime (d->file);
check_renamed (d->file);
if (is_updating (d->file))
{
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
/* silently ignore the order-only dep hack. */
if (file->multi_maybe && d->file == org_file)
{
lastd = d;
d = d->next;
continue;
}
#endif
OSS (error, NILF, _("Circular %s <- %s dependency dropped."),
file->name, d->file->name);
/* We cannot free D here because our the caller will still have
a reference to it when we were called recursively via
check_dep below. */
if (lastd == 0)
file->deps = d->next;
else
lastd->next = d->next;
d = d->next;
continue;
}
d->file->parent = file;
maybe_make = must_make;
/* Inherit dontcare flag from our parent. */
if (rebuilding_makefiles)
{
dontcare = d->file->dontcare;
d->file->dontcare = file->dontcare;
}
new = check_dep (d->file, depth, this_mtime, &maybe_make);
if (new > dep_status)
dep_status = new;
/* Restore original dontcare flag. */
if (rebuilding_makefiles)
d->file->dontcare = dontcare;
if (! d->ignore_mtime)
must_make = maybe_make;
check_renamed (d->file);
{
register struct file *f = d->file;
if (f->double_colon)
f = f->double_colon;
do
{
running |= (f->command_state == cs_running
|| f->command_state == cs_deps_running);
f = f->prev;
}
while (f != 0);
}
if (dep_status && !keep_going_flag)
break;
if (!running)
/* The prereq is considered changed if the timestamp has changed
while it was built, OR it doesn't exist. */
d->changed = ((file_mtime (d->file) != mtime)
|| (mtime == NONEXISTENT_MTIME));
lastd = d;
d = d->next;
}
}
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (dep_status != 0 && !keep_going_flag)
break;
}
file = org_file;
#endif
#ifdef CONFIG_WITH_DOT_MUST_MAKE
/* Check with the .MUST_MAKE target variable if it's
not already decided to make the file. */
# ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (!must_make)
for (f2 = org_file; f2 && !must_make; f2 = f2->multi_next)
must_make = call_must_make_target_var (f2, depth);
# else
if (!must_make)
must_make = call_must_make_target_var (file, depth);
# endif
#endif /* CONFIG_WITH_DOT_MUST_MAKE */
/* Now we know whether this target needs updating.
If it does, update all the intermediate files we depend on. */
if (must_make || always_make_flag)
{
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
for (file = f2 = org_file; f2; file = f2 = f2->multi_next)
#endif
for (d = file->deps; d != 0; d = d->next)
if (d->file->intermediate)
{
enum update_status new;
int dontcare = 0;
FILE_TIMESTAMP mtime = file_mtime (d->file);
check_renamed (d->file);
d->file->parent = file;
/* Inherit dontcare flag from our parent. */
if (rebuilding_makefiles)
{
dontcare = d->file->dontcare;
d->file->dontcare = file->dontcare;
}
/* We may have already considered this file, when we didn't know
we'd need to update it. Force update_file() to consider it and
not prune it. */
d->file->considered = 0;
new = update_file (d->file, depth);
if (new > dep_status)
dep_status = new;
/* Restore original dontcare flag. */
if (rebuilding_makefiles)
d->file->dontcare = dontcare;
check_renamed (d->file);
{
register struct file *f = d->file;
if (f->double_colon)
f = f->double_colon;
do
{
running |= (f->command_state == cs_running
|| f->command_state == cs_deps_running);
f = f->prev;
}
while (f != 0);
}
if (dep_status && !keep_going_flag)
break;
if (!running)
d->changed = ((file->phony && file->cmds != 0)
|| file_mtime (d->file) != mtime);
}
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
file = org_file;
#endif
}
finish_updating (file);
finish_updating (ofile);
DBF (DB_VERBOSE, _("Finished prerequisites of target file '%s'.\n"));
if (running)
{
set_command_state (file, cs_deps_running);
--depth;
DBF (DB_VERBOSE, _("The prerequisites of '%s' are being made.\n"));
return 0;
}
/* If any dependency failed, give up now. */
if (dep_status)
{
/* I'm not sure if we can't just assign dep_status... */
file->update_status = dep_status == us_none ? us_failed : dep_status;
notice_finished_file (file);
--depth;
DBF (DB_VERBOSE, _("Giving up on target file '%s'.\n"));
if (depth == 0 && keep_going_flag
&& !just_print_flag && !question_flag)
OS (error, NILF,
_("Target '%s' not remade because of errors."), file->name);
return dep_status;
}
if (file->command_state == cs_deps_running)
/* The commands for some deps were running on the last iteration, but
they have finished now. Reset the command_state to not_started to
simplify later bookkeeping. It is important that we do this only
when the prior state was cs_deps_running, because that prior state
was definitely propagated to FILE's also_make's by set_command_state
(called above), but in another state an also_make may have
independently changed to finished state, and we would confuse that
file's bookkeeping (updated, but not_started is bogus state). */
set_command_state (file, cs_not_started);
/* Now record which prerequisites are more
recent than this file, so we can define $?. */
deps_changed = 0;
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
for (file = f2 = org_file; f2; file = f2 = f2->multi_next)
#endif
for (d = file->deps; d != 0; d = d->next)
{
FILE_TIMESTAMP d_mtime = file_mtime (d->file);
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (d->file == file && file->multi_maybe)
continue;
#endif
check_renamed (d->file);
if (! d->ignore_mtime)
{
#if 1
/* %%% In version 4, remove this code completely to
implement not remaking deps if their deps are newer
than their parents. */
if (d_mtime == NONEXISTENT_MTIME && !d->file->intermediate)
/* We must remake if this dep does not
exist and is not intermediate. */
must_make = 1;
#endif
/* Set DEPS_CHANGED if this dep actually changed. */
deps_changed |= d->changed;
}
/* Set D->changed if either this dep actually changed,
or its dependent, FILE, is older or does not exist. */
d->changed |= noexist || d_mtime > this_mtime;
if (!noexist && ISDB (DB_BASIC|DB_VERBOSE))
{
const char *fmt = 0;
if (d->ignore_mtime)
{
if (ISDB (DB_VERBOSE))
fmt = _("Prerequisite '%s' is order-only for target '%s'.\n");
}
else if (d_mtime == NONEXISTENT_MTIME)
{
if (ISDB (DB_BASIC))
fmt = _("Prerequisite '%s' of target '%s' does not exist.\n");
}
else if (d->changed)
{
if (ISDB (DB_BASIC))
fmt = _("Prerequisite '%s' is newer than target '%s'.\n");
}
else if (ISDB (DB_VERBOSE))
fmt = _("Prerequisite '%s' is older than target '%s'.\n");
if (fmt)
{
print_spaces (depth);
printf (fmt, dep_name (d), file->name);
fflush (stdout);
}
}
}
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
file = org_file;
#endif
/* Here depth returns to the value it had when we were called. */
depth--;
if (file->double_colon && file->deps == 0)
{
must_make = 1;
DBF (DB_BASIC,
_("Target '%s' is double-colon and has no prerequisites.\n"));
}
else if (!noexist && file->is_target && !deps_changed && file->cmds == 0
&& !always_make_flag)
{
must_make = 0;
DBF (DB_VERBOSE,
_("No recipe for '%s' and no prerequisites actually changed.\n"));
}
else if (!must_make && file->cmds != 0 && always_make_flag)
{
must_make = 1;
DBF (DB_VERBOSE, _("Making '%s' due to always-make flag.\n"));
}
if (!must_make)
{
if (ISDB (DB_VERBOSE))
{
print_spaces (depth);
printf (_("No need to remake target '%s'"), file->name);
if (!streq (file->name, file->hname))
printf (_("; using VPATH name '%s'"), file->hname);
puts (".");
fflush (stdout);
}
notice_finished_file (file);
/* Since we don't need to remake the file, convert it to use the
VPATH filename if we found one. hfile will be either the
local name if no VPATH or the VPATH name if one was found. */
while (file)
{
file->name = file->hname;
file = file->prev;
}
return 0;
}
DBF (DB_BASIC, _("Must remake target '%s'.\n"));
/* It needs to be remade. If it's VPATH and not reset via GPATH, toss the
VPATH. */
if (!streq (file->name, file->hname))
{
DB (DB_BASIC, (_(" Ignoring VPATH name '%s'.\n"), file->hname));
file->ignore_vpath = 1;
}
/* Now, take appropriate actions to remake the file. */
remake_file (file);
if (file->command_state != cs_finished)
{
DBF (DB_VERBOSE, _("Recipe of '%s' is being run.\n"));
return 0;
}
switch (file->update_status)
{
case us_failed:
DBF (DB_BASIC, _("Failed to remake target file '%s'.\n"));
break;
case us_success:
DBF (DB_BASIC, _("Successfully remade target file '%s'.\n"));
break;
case us_question:
DBF (DB_BASIC, _("Target file '%s' needs to be remade under -q.\n"));
break;
case us_none:
break;
}
file->updated = 1;
return file->update_status;
}
#ifdef CONFIG_WITH_DOT_MUST_MAKE
/* Consider the .MUST_MAKE target variable if present.
Returns 1 if must remake, 0 if not.
The deal is that .MUST_MAKE returns non-zero if it thinks the target needs
updating. We have to initialize file variables (for the sake of pattern
vars) and set the most important file variables before calling (expanding)
the .MUST_MAKE variable.
The file variables keeping the dependency lists, $+, $^, $? and $| are not
available at this point because $? depends on things happening after we've
decided to make the file. So, to keep things simple all 4 of them are
undefined in this call. */
static int
call_must_make_target_var (struct file *file, unsigned int depth)
{
struct variable *var;
unsigned char ch;
const char *str;
if (file->variables)
{
var = lookup_variable_in_set (".MUST_MAKE", sizeof (".MUST_MAKE") - 1,
file->variables->set);
if (var)
{
initialize_file_variables (file, 0);
set_file_variables (file, 1 /* called early, no dep lists please */);
str = variable_expand_for_file_2 (NULL,
var->value, var->value_length,
file, NULL);
/* Stripped string should be non-zero. */
ch = *str;
while (ISSPACE (ch))
ch = *++str;
if (ch != '\0')
{
if (ISDB (DB_BASIC))
{
print_spaces (depth);
printf (_(".MUST_MAKE returned `%s' for target `%s'.\n"),
str, file->name);
}
return 1;
}
}
}
return 0;
}
#endif /* CONFIG_WITH_DOT_MUST_MAKE */
#ifdef CONFIG_WITH_DOT_IS_CHANGED
/* Consider the .IS_CHANGED target variable if present.
Returns 1 if the file should be considered modified, 0 if not.
The calling context and restrictions are the same as for .MUST_MAKE.
Make uses the information from this 'function' for determining whether to
make a file which lists this as a prerequisite. So, this is the feature you
use to check MD5 sums, file sizes, time stamps and the like with data from
a previous run.
FIXME: Would be nice to know which file is currently being considered.
FIXME: Is currently not invoked for intermediate files. */
static int
call_is_changed_target_var (struct file *file)
{
struct variable *var;
unsigned char ch;
const char *str;
if (file->variables)
{
var = lookup_variable_in_set (".IS_CHANGED", sizeof (".IS_CHANGED") - 1,
file->variables->set);
if (var)
{
initialize_file_variables (file, 0);
set_file_variables (file, 1 /* called early, no dep lists please */);
str = variable_expand_for_file_2 (NULL,
var->value, var->value_length,
file, NULL);
/* stripped string should be non-zero. */
do
ch = *str++;
while (ISSPACE (ch));
return (ch != '\0');
}
}
return 0;
}
#endif /* CONFIG_WITH_DOT_IS_CHANGED */
/* Set FILE's 'updated' flag and re-check its mtime and the mtime's of all
files listed in its 'also_make' member. Under -t, this function also
touches FILE.
On return, FILE->update_status will no longer be us_none if it was. */
void
notice_finished_file (struct file *file)
{
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
struct file *f2;
#endif
struct dep *d;
int ran = file->command_state == cs_running;
int touched = 0;
DB (DB_JOBS, (_("notice_finished_file - entering: file=%p `%s' update_status=%d command_state=%d\n"), /* bird */
(void *) file, file->name, file->update_status, file->command_state));
file->command_state = cs_finished;
file->updated = 1;
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (file->multi_head)
{
assert (file == file->multi_head);
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
{
f2->command_state = cs_finished;
f2->updated = 1;
}
}
#endif
#ifdef CONFIG_WITH_EXTENDED_NOTPARALLEL
/* update not_parallel if the file was flagged for that. */
if ( ran
&& (file->command_flags & (COMMANDS_NOTPARALLEL | COMMANDS_NO_COMMANDS))
== COMMANDS_NOTPARALLEL)
{
DB (DB_KMK, (_("not_parallel %d -> %d (file=%p `%s') [notice_finished_file]\n"), not_parallel,
not_parallel - 1, (void *) file, file->name));
assert(not_parallel >= 1);
--not_parallel;
}
#endif
if (touch_flag
/* The update status will be:
us_success if 0 or more commands (+ or ${MAKE}) were run and won;
us_none if this target was not remade;
>us_none if some commands were run and lost.
We touch the target if it has commands which either were not run
or won when they ran (i.e. status is 0). */
&& file->update_status == us_success)
{
if (file->cmds != 0 && file->cmds->any_recurse)
{
/* If all the command lines were recursive,
we don't want to do the touching. */
unsigned int i;
for (i = 0; i < file->cmds->ncommand_lines; ++i)
if (!(file->cmds->lines_flags[i] & COMMANDS_RECURSE))
goto have_nonrecursing;
}
else
{
have_nonrecursing:
if (file->phony)
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
{
file->update_status = us_success;
if (file->multi_head)
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
f2->update_status = us_success;
}
#else
file->update_status = us_success;
#endif
/* According to POSIX, -t doesn't affect targets with no cmds. */
else if (file->cmds != 0)
{
/* Should set file's modification date and do nothing else. */
file->update_status = touch_file (file);
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (file->multi_head)
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
{
/* figure out this, touch if it exist ignore otherwise? */
}
#endif
/* Pretend we ran a real touch command, to suppress the
"'foo' is up to date" message. */
commands_started++;
/* Request for the timestamp to be updated (and distributed
to the double-colon entries). Simply setting ran=1 would
almost have done the trick, but messes up with the also_make
updating logic below. */
touched = 1;
}
}
}
if (file->mtime_before_update == UNKNOWN_MTIME)
file->mtime_before_update = file->last_mtime;
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (file->multi_head)
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
if (f2->mtime_before_update == UNKNOWN_MTIME)
f2->mtime_before_update = f2->last_mtime;
#endif
if ((ran && !file->phony) || touched)
{
int i = 0;
/* If -n, -t, or -q and all the commands are recursive, we ran them so
really check the target's mtime again. Otherwise, assume the target
would have been updated. */
if ((question_flag || just_print_flag || touch_flag) && file->cmds)
{
for (i = file->cmds->ncommand_lines; i > 0; --i)
if (! (file->cmds->lines_flags[i-1] & COMMANDS_RECURSE))
break;
}
/* If there were no commands at all, it's always new. */
else if (file->is_target && file->cmds == 0)
i = 1;
file->last_mtime = i == 0 ? UNKNOWN_MTIME : NEW_MTIME;
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
if (file->multi_head)
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
file->last_mtime = i == 0 ? UNKNOWN_MTIME : NEW_MTIME; /*??*/
#endif
}
if (file->double_colon)
{
/* If this is a double colon rule and it is the last one to be
updated, propagate the change of modification time to all the
double-colon entries for this file.
We do it on the last update because it is important to handle
individual entries as separate rules with separate timestamps
while they are treated as targets and then as one rule with the
unified timestamp when they are considered as a prerequisite
of some target. */
struct file *f;
FILE_TIMESTAMP max_mtime = file->last_mtime;
/* Check that all rules were updated and at the same time find
the max timestamp. We assume UNKNOWN_MTIME is newer then
any other value. */
for (f = file->double_colon; f != 0 && f->updated; f = f->prev)
if (max_mtime != UNKNOWN_MTIME
&& (f->last_mtime == UNKNOWN_MTIME || f->last_mtime > max_mtime))
max_mtime = f->last_mtime;
if (f == 0)
for (f = file->double_colon; f != 0; f = f->prev)
f->last_mtime = max_mtime;
}
if (ran && file->update_status != us_none)
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
{
#endif
/* We actually tried to update FILE, which has
updated its also_make's as well (if it worked).
If it didn't work, it wouldn't work again for them.
So mark them as updated with the same status. */
for (d = file->also_make; d != 0; d = d->next)
{
d->file->command_state = cs_finished;
d->file->updated = 1;
d->file->update_status = file->update_status;
if (ran && !d->file->phony)
/* Fetch the new modification time.
We do this instead of just invalidating the cached time
so that a vpath_search can happen. Otherwise, it would
never be done because the target is already updated. */
f_mtime (d->file, 0);
}
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
/* Same as above but for explicit multi target rules. */
if (file->multi_head)
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
{
f2->update_status = file->update_status;
if (!f2->phony)
f_mtime (f2, 0);
}
}
#endif
else if (file->update_status == us_none)
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
{
/* Nothing was done for FILE, but it needed nothing done.
So mark it now as "succeeded". */
file->update_status = 0;
if (file->multi_head)
for (f2 = file->multi_next; f2 != 0; f2 = f2->multi_next)
f2->update_status = 0;
}
#else
/* Nothing was done for FILE, but it needed nothing done.
So mark it now as "succeeded". */
file->update_status = us_success;
#endif
#ifdef CONFIG_WITH_MEMORY_OPTIMIZATIONS
/* We're done with this command, so free the memory held by the chopped
command lines. Saves heap for the compilers & linkers. */
if (file->cmds && file->cmds->command_lines)
free_chopped_commands (file->cmds);
#endif
}
/* Check whether another file (whose mtime is THIS_MTIME) needs updating on
account of a dependency which is file FILE. If it does, store 1 in
*MUST_MAKE_PTR. In the process, update any non-intermediate files that
FILE depends on (including FILE itself). Return nonzero if any updating
failed. */
static enum update_status
check_dep (struct file *file, unsigned int depth,
FILE_TIMESTAMP this_mtime, int *must_make_ptr)
{
struct file *ofile;
struct dep *d;
enum update_status dep_status = us_success;
++depth;
start_updating (file);
/* We might change file if we find a different one via vpath;
remember this one to turn off updating. */
ofile = file;
if (file->phony || !file->intermediate)
{
/* If this is a non-intermediate file, update it and record whether it
is newer than THIS_MTIME. */
FILE_TIMESTAMP mtime;
dep_status = update_file (file, depth);
check_renamed (file);
mtime = file_mtime (file);
check_renamed (file);
if (mtime == NONEXISTENT_MTIME || mtime > this_mtime)
*must_make_ptr = 1;
#ifdef CONFIG_WITH_DOT_IS_CHANGED
else if ( *must_make_ptr == 0
&& call_is_changed_target_var (file))
*must_make_ptr = 1;
#endif /* CONFIG_WITH_DOT_IS_CHANGED */
}
else
{
/* FILE is an intermediate file. */
FILE_TIMESTAMP mtime;
if (!file->phony && file->cmds == 0 && !file->tried_implicit)
{
if (try_implicit_rule (file, depth))
DBF (DB_IMPLICIT, _("Found an implicit rule for '%s'.\n"));
else
DBF (DB_IMPLICIT, _("No implicit rule found for '%s'.\n"));
file->tried_implicit = 1;
}
if (file->cmds == 0 && !file->is_target
&& default_file != 0 && default_file->cmds != 0)
{
DBF (DB_IMPLICIT, _("Using default commands for '%s'.\n"));
file->cmds = default_file->cmds;
}
check_renamed (file);
mtime = file_mtime (file);
check_renamed (file);
if (mtime != NONEXISTENT_MTIME && mtime > this_mtime)
/* If the intermediate file actually exists and is newer, then we
should remake from it. */
*must_make_ptr = 1;
else
{
/* Otherwise, update all non-intermediate files we depend on, if
necessary, and see whether any of them is more recent than the
file on whose behalf we are checking. */
struct dep *ld;
int deps_running = 0;
/* If this target is not running, set it's state so that we check it
fresh. It could be it was checked as part of an order-only
prerequisite and so wasn't rebuilt then, but should be now. */
if (file->command_state != cs_running)
{
/* If the target was waiting for a dependency it has to be
reconsidered, as that dependency might have finished. */
if (file->command_state == cs_deps_running)
file->considered = 0;
set_command_state (file, cs_not_started);
}
ld = 0;
d = file->deps;
while (d != 0)
{
enum update_status new;
int maybe_make;
if (is_updating (d->file))
{
OSS (error, NILF, _("Circular %s <- %s dependency dropped."),
file->name, d->file->name);
if (ld == 0)
{
file->deps = d->next;
free_dep (d);
d = file->deps;
}
else
{
ld->next = d->next;
free_dep (d);
d = ld->next;
}
continue;
}
d->file->parent = file;
maybe_make = *must_make_ptr;
new = check_dep (d->file, depth, this_mtime, &maybe_make);
if (new > dep_status)
dep_status = new;
if (! d->ignore_mtime)
*must_make_ptr = maybe_make;
check_renamed (d->file);
if (dep_status && !keep_going_flag)
break;
if (d->file->command_state == cs_running
|| d->file->command_state == cs_deps_running)
deps_running = 1;
ld = d;
d = d->next;
}
if (deps_running)
/* Record that some of FILE's deps are still being made.
This tells the upper levels to wait on processing it until the
commands are finished. */
set_command_state (file, cs_deps_running);
}
}
finish_updating (file);
finish_updating (ofile);
return dep_status;
}
/* Touch FILE. Return us_success if successful, us_failed if not. */
#define TOUCH_ERROR(call) do{ perror_with_name ((call), file->name); \
return us_failed; }while(0)
static enum update_status
touch_file (struct file *file)
{
if (!silent_flag)
OS (message, 0, "touch %s", file->name);
/* Print-only (-n) takes precedence over touch (-t). */
if (just_print_flag)
return us_success;
#ifndef NO_ARCHIVES
if (ar_name (file->name))
return ar_touch (file->name) ? us_failed : us_success;
else
#endif
{
int fd;
EINTRLOOP (fd, open (file->name, O_RDWR | O_CREAT, 0666));
if (fd < 0)
TOUCH_ERROR ("touch: open: ");
else
{
struct stat statbuf;
char buf = 'x';
int e;
EINTRLOOP (e, fstat (fd, &statbuf));
if (e < 0)
TOUCH_ERROR ("touch: fstat: ");
/* Rewrite character 0 same as it already is. */
EINTRLOOP (e, read (fd, &buf, 1));
if (e < 0)
TOUCH_ERROR ("touch: read: ");
{
off_t o;
EINTRLOOP (o, lseek (fd, 0L, 0));
if (o < 0L)
TOUCH_ERROR ("touch: lseek: ");
}
EINTRLOOP (e, write (fd, &buf, 1));
if (e < 0)
TOUCH_ERROR ("touch: write: ");
/* If file length was 0, we just changed it, so change it back. */
if (statbuf.st_size == 0)
{
(void) close (fd);
EINTRLOOP (fd, open (file->name, O_RDWR | O_TRUNC, 0666));
if (fd < 0)
TOUCH_ERROR ("touch: open: ");
}
(void) close (fd);
}
}
return us_success;
}
/* Having checked and updated the dependencies of FILE,
do whatever is appropriate to remake FILE itself.
Return the status from executing FILE's commands. */
static void
remake_file (struct file *file)
{
#ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
assert(file->multi_head == NULL || file->multi_head == file);
#endif
if (file->cmds == 0)
{
if (file->phony)
/* Phony target. Pretend it succeeded. */
file->update_status = us_success;
else if (file->is_target)
/* This is a nonexistent target file we cannot make.
Pretend it was successfully remade. */
file->update_status = us_success;
else
{
/* This is a dependency file we cannot remake. Fail. */
if (!rebuilding_makefiles || !file->dontcare)
complain (file);
file->update_status = us_failed;
}
}
else
{
chop_commands (file->cmds);
/* The normal case: start some commands. */
if (!touch_flag || file->cmds->any_recurse)
{
execute_file_commands (file);
return;
}
/* This tells notice_finished_file it is ok to touch the file. */
file->update_status = us_success;
}
/* This does the touching under -t. */
notice_finished_file (file);
}
/* Return the mtime of a file, given a 'struct file'.
Caches the time in the struct file to avoid excess stat calls.
If the file is not found, and SEARCH is nonzero, VPATH searching and
replacement is done. If that fails, a library (-lLIBNAME) is tried and
the library's actual name (/lib/libLIBNAME.a, etc.) is substituted into
FILE. */
FILE_TIMESTAMP
f_mtime (struct file *file, int search)
{
FILE_TIMESTAMP mtime;
int propagate_timestamp;
/* File's mtime is not known; must get it from the system. */
#ifndef NO_ARCHIVES
if (ar_name (file->name))
{
/* This file is an archive-member reference. */
char *arname, *memname;
struct file *arfile;
time_t member_date;
/* Find the archive's name. */
ar_parse_name (file->name, &arname, &memname);
/* Find the modification time of the archive itself.
Also allow for its name to be changed via VPATH search. */
arfile = lookup_file (arname);
if (arfile == 0)
arfile = enter_file (strcache_add (arname));
mtime = f_mtime (arfile, search);
check_renamed (arfile);
if (search && strcmp (arfile->hname, arname))
{
/* The archive's name has changed.
Change the archive-member reference accordingly. */
char *name;
unsigned int arlen, memlen;
arlen = strlen (arfile->hname);
memlen = strlen (memname);
name = alloca (arlen + 1 + memlen + 2);
memcpy (name, arfile->hname, arlen);
name[arlen] = '(';
memcpy (name + arlen + 1, memname, memlen);
name[arlen + 1 + memlen] = ')';
name[arlen + 1 + memlen + 1] = '\0';
/* If the archive was found with GPATH, make the change permanent;
otherwise defer it until later. */
if (arfile->name == arfile->hname)
rename_file (file, strcache_add (name));
else
rehash_file (file, strcache_add (name));
check_renamed (file);
}
free (arname);
file->low_resolution_time = 1;
if (mtime == NONEXISTENT_MTIME)
/* The archive doesn't exist, so its members don't exist either. */
return NONEXISTENT_MTIME;
member_date = ar_member_date (file->hname);
mtime = (member_date == (time_t) -1
? NONEXISTENT_MTIME
: file_timestamp_cons (file->hname, member_date, 0));
}
else
#endif
{
mtime = name_mtime (file->name);
if (mtime == NONEXISTENT_MTIME && search && !file->ignore_vpath)
{
/* If name_mtime failed, search VPATH. */
const char *name = vpath_search (file->name, &mtime, NULL, NULL);
if (name
/* Last resort, is it a library (-lxxx)? */
|| (file->name[0] == '-' && file->name[1] == 'l'
&& (name = library_search (file->name, &mtime)) != 0))
{
int name_len;
if (mtime != UNKNOWN_MTIME)
/* vpath_search and library_search store UNKNOWN_MTIME
if they didn't need to do a stat call for their work. */
file->last_mtime = mtime;
/* If we found it in VPATH, see if it's in GPATH too; if so,
change the name right now; if not, defer until after the
dependencies are updated. */
#ifndef VMS
name_len = strlen (name) - strlen (file->name) - 1;
#else
name_len = strlen (name) - strlen (file->name);
if (name[name_len - 1] == '/')
name_len--;
#endif
if (gpath_search (name, name_len))
{
rename_file (file, name);
check_renamed (file);
return file_mtime (file);
}
rehash_file (file, name);
check_renamed (file);
/* If the result of a vpath search is -o or -W, preserve it.
Otherwise, find the mtime of the resulting file. */
if (mtime != OLD_MTIME && mtime != NEW_MTIME)
mtime = name_mtime (name);
}
}
}
/* Files can have bogus timestamps that nothing newly made will be
"newer" than. Updating their dependents could just result in loops.
So notify the user of the anomaly with a warning.
We only need to do this once, for now. */
if (!clock_skew_detected
&& mtime != NONEXISTENT_MTIME && mtime != NEW_MTIME
&& !file->updated)
{
static FILE_TIMESTAMP adjusted_now;
FILE_TIMESTAMP adjusted_mtime = mtime;
#if defined(WINDOWS32) || defined(__MSDOS__)
/* Experimentation has shown that FAT filesystems can set file times
up to 3 seconds into the future! Play it safe. */
#define FAT_ADJ_OFFSET (FILE_TIMESTAMP) 3
FILE_TIMESTAMP adjustment = FAT_ADJ_OFFSET << FILE_TIMESTAMP_LO_BITS;
if (ORDINARY_MTIME_MIN + adjustment <= adjusted_mtime)
adjusted_mtime -= adjustment;
#elif defined(__EMX__)
/* FAT filesystems round time to the nearest even second!
Allow for any file (NTFS or FAT) to perhaps suffer from this
brain damage. */
FILE_TIMESTAMP adjustment = (((FILE_TIMESTAMP_S (adjusted_mtime) & 1) == 0
&& FILE_TIMESTAMP_NS (adjusted_mtime) == 0)
? (FILE_TIMESTAMP) 1 << FILE_TIMESTAMP_LO_BITS
: 0);
#endif
/* If the file's time appears to be in the future, update our
concept of the present and try once more. */
if (adjusted_now < adjusted_mtime)
{
int resolution;
FILE_TIMESTAMP now = file_timestamp_now (&resolution);
adjusted_now = now + (resolution - 1);
if (adjusted_now < adjusted_mtime)
{
#ifdef NO_FLOAT
OS (error, NILF,
_("Warning: File '%s' has modification time in the future"),
file->name);
#else
double from_now =
(FILE_TIMESTAMP_S (mtime) - FILE_TIMESTAMP_S (now)
+ ((FILE_TIMESTAMP_NS (mtime) - FILE_TIMESTAMP_NS (now))
/ 1e9));
char from_now_string[100];
if (from_now >= 99 && from_now <= ULONG_MAX)
sprintf (from_now_string, "%lu", (unsigned long) from_now);
else
sprintf (from_now_string, "%.2g", from_now);
OSS (error, NILF,
_("Warning: File '%s' has modification time %s s in the future"),
file->name, from_now_string);
#endif
clock_skew_detected = 1;
}
}
}
/* Store the mtime into all the entries for this file for which it is safe
to do so: avoid propagating timestamps to double-colon rules that haven't
been examined so they're run or not based on the pre-update timestamp. */
if (file->double_colon)
file = file->double_colon;
propagate_timestamp = file->updated;
do
{
/* If this file is not implicit but it is intermediate then it was
made so by the .INTERMEDIATE target. If this file has never
been built by us but was found now, it existed before make
started. So, turn off the intermediate bit so make doesn't
delete it, since it didn't create it. */
if (mtime != NONEXISTENT_MTIME && file->command_state == cs_not_started
&& !file->tried_implicit && file->intermediate)
file->intermediate = 0;
if (file->updated == propagate_timestamp)
file->last_mtime = mtime;
file = file->prev;
}
while (file != 0);
return mtime;
}
/* Return the mtime of the file or archive-member reference NAME. */
/* First, we check with stat(). If the file does not exist, then we return
NONEXISTENT_MTIME. If it does, and the symlink check flag is set, then
examine each indirection of the symlink and find the newest mtime.
This causes one duplicate stat() when -L is being used, but the code is
much cleaner. */
static FILE_TIMESTAMP
name_mtime (const char *name)
{
FILE_TIMESTAMP mtime;
struct stat st;
int e;
#if defined(KMK) && defined(KBUILD_OS_WINDOWS)
extern int stat_only_mtime(const char *pszPath, struct stat *pStat);
e = stat_only_mtime (name, &st);
#else
EINTRLOOP (e, stat (name, &st));
#endif
if (e == 0)
mtime = FILE_TIMESTAMP_STAT_MODTIME (name, st);
else if (errno == ENOENT || errno == ENOTDIR)
mtime = NONEXISTENT_MTIME;
else
{
perror_with_name ("stat: ", name);
return NONEXISTENT_MTIME;
}
/* If we get here we either found it, or it doesn't exist.
If it doesn't exist see if we can use a symlink mtime instead. */
#ifdef MAKE_SYMLINKS
#ifndef S_ISLNK
# define S_ISLNK(_m) (((_m)&S_IFMT)==S_IFLNK)
#endif
if (check_symlink_flag)
{
PATH_VAR (lpath);
/* Check each symbolic link segment (if any). Find the latest mtime
amongst all of them (and the target file of course).
Note that we have already successfully dereferenced all the links
above. So, if we run into any error trying to lstat(), or
readlink(), or whatever, something bizarre-o happened. Just give up
and use whatever mtime we've already computed at that point. */
strcpy (lpath, name);
while (1)
{
FILE_TIMESTAMP ltime;
PATH_VAR (lbuf);
long llen;
char *p;
EINTRLOOP (e, lstat (lpath, &st));
if (e)
{
/* Just take what we have so far. */
if (errno != ENOENT && errno != ENOTDIR)
perror_with_name ("lstat: ", lpath);
break;
}
/* If this is not a symlink, we're done (we started with the real
file's mtime so we don't need to test it again). */
if (!S_ISLNK (st.st_mode))
break;
/* If this mtime is newer than what we had, keep the new one. */
ltime = FILE_TIMESTAMP_STAT_MODTIME (lpath, st);
if (ltime > mtime)
mtime = ltime;
/* Set up to check the file pointed to by this link. */
EINTRLOOP (llen, readlink (lpath, lbuf, GET_PATH_MAX));
if (llen < 0)
{
/* Eh? Just take what we have. */
perror_with_name ("readlink: ", lpath);
break;
}
lbuf[llen] = '\0';
/* If the target is fully-qualified or the source is just a
filename, then the new path is the target. Otherwise it's the
source directory plus the target. */
if (lbuf[0] == '/' || (p = strrchr (lpath, '/')) == NULL)
strcpy (lpath, lbuf);
else if ((p - lpath) + llen + 2 > GET_PATH_MAX)
/* Eh? Path too long! Again, just go with what we have. */
break;
else
/* Create the next step in the symlink chain. */
strcpy (p+1, lbuf);
}
}
#endif
return mtime;
}
/* Search for a library file specified as -lLIBNAME, searching for a
suitable library file in the system library directories and the VPATH
directories. */
static const char *
library_search (const char *lib, FILE_TIMESTAMP *mtime_ptr)
{
static const char *dirs[] =
{
#ifdef KMK
".",
#else /* !KMK */
#ifndef _AMIGA
"/lib",
"/usr/lib",
#endif
#if defined(WINDOWS32) && !defined(LIBDIR)
/*
* This is completely up to the user at product install time. Just define
* a placeholder.
*/
#define LIBDIR "."
#endif
# ifdef LIBDIR /* bird */
LIBDIR, /* Defined by configuration. */
# else /* bird */
".", /* bird */
# endif /* bird */
#endif /* !KMK */
0
};
const char *file = 0;
char *libpatterns;
FILE_TIMESTAMP mtime;
/* Loop variables for the libpatterns value. */
char *p;
const char *p2;
unsigned int len;
unsigned int liblen;
/* Information about the earliest (in the vpath sequence) match. */
unsigned int best_vpath = 0, best_path = 0;
const char **dp;
libpatterns = xstrdup (variable_expand ("$(.LIBPATTERNS)"));
/* Skip the '-l'. */
lib += 2;
liblen = strlen (lib);
/* Loop through all the patterns in .LIBPATTERNS, and search on each one.
To implement the linker-compatible behavior we have to search through
all entries in .LIBPATTERNS and choose the "earliest" one. */
p2 = libpatterns;
while ((p = find_next_token (&p2, &len)) != 0)
{
static char *buf = NULL;
static unsigned int buflen = 0;
static int libdir_maxlen = -1;
static unsigned int std_dirs = 0;
char *libbuf = variable_expand ("");
const size_t libbuf_offset = libbuf - variable_buffer; /* bird */
/* Expand the pattern using LIB as a replacement. */
{
char c = p[len];
char *p3, *p4;
p[len] = '\0';
p3 = find_percent (p);
if (!p3)
{
/* Give a warning if there is no pattern. */
OS (error, NILF,
_(".LIBPATTERNS element '%s' is not a pattern"), p);
p[len] = c;
continue;
}
p4 = variable_buffer_output (libbuf, p, p3-p);
p4 = variable_buffer_output (p4, lib, liblen);
p4 = variable_buffer_output (p4, p3+1, len - (p3-p));
p[len] = c;
libbuf = variable_buffer + libbuf_offset; /* bird - variable_buffer may have been reallocated. UPSTREAM */
}
/* Look first for 'libNAME.a' in the current directory. */
mtime = name_mtime (libbuf);
if (mtime != NONEXISTENT_MTIME)
{
if (mtime_ptr != 0)
*mtime_ptr = mtime;
file = strcache_add (libbuf);
/* This by definition will have the best index, so stop now. */
break;
}
/* Now try VPATH search on that. */
{
unsigned int vpath_index, path_index;
const char* f = vpath_search (libbuf, mtime_ptr ? &mtime : NULL,
&vpath_index, &path_index);
if (f)
{
/* If we have a better match, record it. */
if (file == 0 ||
vpath_index < best_vpath ||
(vpath_index == best_vpath && path_index < best_path))
{
file = f;
best_vpath = vpath_index;
best_path = path_index;
if (mtime_ptr != 0)
*mtime_ptr = mtime;
}
}
}
/* Now try the standard set of directories. */
if (!buflen)
{
for (dp = dirs; *dp != 0; ++dp)
{
int l = strlen (*dp);
if (l > libdir_maxlen)
libdir_maxlen = l;
std_dirs++;
}
buflen = strlen (libbuf);
buf = xmalloc (libdir_maxlen + buflen + 2);
}
else if (buflen < strlen (libbuf))
{
buflen = strlen (libbuf);
buf = xrealloc (buf, libdir_maxlen + buflen + 2);
}
{
/* Use the last std_dirs index for standard directories. This
was it will always be greater than the VPATH index. */
unsigned int vpath_index = ~((unsigned int)0) - std_dirs;
for (dp = dirs; *dp != 0; ++dp)
{
sprintf (buf, "%s/%s", *dp, libbuf);
mtime = name_mtime (buf);
if (mtime != NONEXISTENT_MTIME)
{
if (file == 0 || vpath_index < best_vpath)
{
file = strcache_add (buf);
best_vpath = vpath_index;
if (mtime_ptr != 0)
*mtime_ptr = mtime;
}
}
vpath_index++;
}
}
}
free (libpatterns);
return file;
}