make/variable.c

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/* Internals of variables for GNU Make.
Copyright (C) 1988,89,90,91,92,93,94,96,97 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 2, 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 GNU Make; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "make.h"
#include "dep.h"
#include "filedef.h"
#include "job.h"
#include "commands.h"
#include "variable.h"
#include "rule.h"
#ifdef WINDOWS32
#include "pathstuff.h"
#endif
/* Hash table of all global variable definitions. */
#ifndef VARIABLE_BUCKETS
#define VARIABLE_BUCKETS 523
#endif
#ifndef PERFILE_VARIABLE_BUCKETS
#define PERFILE_VARIABLE_BUCKETS 23
#endif
#ifndef SMALL_SCOPE_VARIABLE_BUCKETS
#define SMALL_SCOPE_VARIABLE_BUCKETS 13
#endif
static struct variable *variable_table[VARIABLE_BUCKETS];
static struct variable_set global_variable_set
= { variable_table, VARIABLE_BUCKETS };
static struct variable_set_list global_setlist
= { 0, &global_variable_set };
struct variable_set_list *current_variable_set_list = &global_setlist;
static struct variable *lookup_variable_in_set PARAMS ((char *name,
unsigned int length, struct variable_set *set));
/* Implement variables. */
/* Define variable named NAME with value VALUE in SET. VALUE is copied.
LENGTH is the length of NAME, which does not need to be null-terminated.
ORIGIN specifies the origin of the variable (makefile, command line
or environment).
If RECURSIVE is nonzero a flag is set in the variable saying
that it should be recursively re-expanded. */
struct variable *
define_variable_in_set (name, length, value, origin, recursive, set, flocp)
char *name;
unsigned int length;
char *value;
enum variable_origin origin;
int recursive;
struct variable_set *set;
const struct floc *flocp;
{
register unsigned int i;
register unsigned int hashval;
register struct variable *v;
hashval = 0;
for (i = 0; i < length; ++i)
HASH (hashval, name[i]);
hashval %= set->buckets;
for (v = set->table[hashval]; v != 0; v = v->next)
if (*v->name == *name
&& strneq (v->name + 1, name + 1, length - 1)
&& v->name[length] == '\0')
break;
if (env_overrides && origin == o_env)
origin = o_env_override;
if (v != 0)
{
if (env_overrides && v->origin == o_env)
/* V came from in the environment. Since it was defined
before the switches were parsed, it wasn't affected by -e. */
v->origin = o_env_override;
/* A variable of this name is already defined.
If the old definition is from a stronger source
than this one, don't redefine it. */
if ((int) origin >= (int) v->origin)
{
if (v->value != 0)
free (v->value);
v->value = xstrdup (value);
if (flocp != 0)
v->fileinfo = *flocp;
else
v->fileinfo.filenm = 0;
v->origin = origin;
v->recursive = recursive;
}
return v;
}
/* Create a new variable definition and add it to the hash table. */
v = (struct variable *) xmalloc (sizeof (struct variable));
v->name = savestring (name, length);
v->value = xstrdup (value);
if (flocp != 0)
v->fileinfo = *flocp;
else
v->fileinfo.filenm = 0;
v->origin = origin;
v->recursive = recursive;
v->expanding = 0;
v->per_target = 0;
v->append = 0;
v->export = v_default;
v->next = set->table[hashval];
set->table[hashval] = v;
return v;
}
/* Lookup a variable whose name is a string starting at NAME
and with LENGTH chars. NAME need not be null-terminated.
Returns address of the `struct variable' containing all info
on the variable, or nil if no such variable is defined.
If we find a variable which is in the process of being expanded,
try to find one further up the set_list chain. If we don't find
one that isn't being expanded, return a pointer to whatever we
_did_ find. */
struct variable *
lookup_variable (name, length)
char *name;
unsigned int length;
{
register struct variable_set_list *setlist;
struct variable *firstv = 0;
register unsigned int i;
register unsigned int rawhash = 0;
for (i = 0; i < length; ++i)
HASH (rawhash, name[i]);
for (setlist = current_variable_set_list;
setlist != 0; setlist = setlist->next)
{
register struct variable_set *set = setlist->set;
register unsigned int hashval = rawhash % set->buckets;
register struct variable *v;
/* Look through this set list. */
for (v = set->table[hashval]; v != 0; v = v->next)
if (*v->name == *name
&& strneq (v->name + 1, name + 1, length - 1)
&& v->name[length] == '\0')
break;
/* If we didn't find anything, go to the next set list. */
if (!v)
continue;
/* If it's not being expanded already, we're done. */
if (!v->expanding)
return v;
/* It is, so try to find another one. If this is the first one we've
seen, keep a pointer in case we don't find anything else. */
if (!firstv)
firstv = v;
}
#ifdef VMS
/* since we don't read envp[] on startup, try to get the
variable via getenv() here. */
if (!firstv)
{
char *vname = alloca (length + 1);
char *value;
strncpy (vname, name, length);
vname[length] = 0;
value = getenv (vname);
if (value != 0)
{
char *sptr;
int scnt;
sptr = value;
scnt = 0;
if (listp)
*listp = current_variable_set_list;
while ((sptr = strchr (sptr, '$')))
{
scnt++;
sptr++;
}
if (scnt > 0)
{
char *nvalue;
char *nptr;
nvalue = alloca (length + scnt + 1);
sptr = value;
nptr = nvalue;
while (*sptr)
{
if (*sptr == '$')
{
*nptr++ = '$';
*nptr++ = '$';
}
else
{
*nptr++ = *sptr;
}
sptr++;
}
return define_variable (vname, length, nvalue, o_env, 1);
}
return define_variable (vname, length, value, o_env, 1);
}
}
#endif /* VMS */
return firstv;
}
/* Lookup a variable whose name is a string starting at NAME
and with LENGTH chars in set SET. NAME need not be null-terminated.
Returns address of the `struct variable' containing all info
on the variable, or nil if no such variable is defined. */
static struct variable *
lookup_variable_in_set (name, length, set)
char *name;
unsigned int length;
struct variable_set *set;
{
register unsigned int i;
register unsigned int hash = 0;
register struct variable *v;
for (i = 0; i < length; ++i)
HASH (hash, name[i]);
hash %= set->buckets;
for (v = set->table[hash]; v != 0; v = v->next)
if (*v->name == *name
&& strneq (v->name + 1, name + 1, length - 1)
&& v->name[length] == 0)
return v;
return 0;
}
/* Initialize FILE's variable set list. If FILE already has a variable set
list, the topmost variable set is left intact, but the the rest of the
chain is replaced with FILE->parent's setlist. If we're READing a
makefile, don't do the pattern variable search now, since the pattern
variable might not have been defined yet. */
void
initialize_file_variables (file, reading)
struct file *file;
int reading;
{
register struct variable_set_list *l = file->variables;
if (l == 0)
{
l = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
l->set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
l->set->buckets = PERFILE_VARIABLE_BUCKETS;
l->set->table = (struct variable **)
xmalloc (l->set->buckets * sizeof (struct variable *));
bzero ((char *) l->set->table,
l->set->buckets * sizeof (struct variable *));
file->variables = l;
}
if (file->parent == 0)
l->next = &global_setlist;
else
{
initialize_file_variables (file->parent, reading);
l->next = file->parent->variables;
}
/* If we're not reading makefiles and we haven't looked yet, see if
we can find a pattern variable. */
if (!reading && !file->pat_searched)
{
struct pattern_var *p = lookup_pattern_var (file->name);
file->pat_searched = 1;
if (p != 0)
{
/* If we found one, insert it between the current target's
variables and the next set, whatever it is. */
file->pat_variables = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
file->pat_variables->set = p->vars->set;
}
}
/* If we have a pattern variable match, set it up. */
if (file->pat_variables != 0)
{
file->pat_variables->next = l->next;
l->next = file->pat_variables;
}
}
/* Pop the top set off the current variable set list,
and free all its storage. */
void
pop_variable_scope ()
{
register struct variable_set_list *setlist = current_variable_set_list;
register struct variable_set *set = setlist->set;
register unsigned int i;
current_variable_set_list = setlist->next;
free ((char *) setlist);
for (i = 0; i < set->buckets; ++i)
{
register struct variable *next = set->table[i];
while (next != 0)
{
register struct variable *v = next;
next = v->next;
free (v->name);
if (v->value)
free (v->value);
free ((char *) v);
}
}
free ((char *) set->table);
free ((char *) set);
}
struct variable_set_list *
create_new_variable_set ()
{
register struct variable_set_list *setlist;
register struct variable_set *set;
set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
set->buckets = SMALL_SCOPE_VARIABLE_BUCKETS;
set->table = (struct variable **)
xmalloc (set->buckets * sizeof (struct variable *));
bzero ((char *) set->table, set->buckets * sizeof (struct variable *));
setlist = (struct variable_set_list *)
xmalloc (sizeof (struct variable_set_list));
setlist->set = set;
setlist->next = current_variable_set_list;
return setlist;
}
/* Create a new variable set and push it on the current setlist. */
struct variable_set_list *
push_new_variable_scope ()
{
return (current_variable_set_list = create_new_variable_set());
}
/* Merge SET1 into SET0, freeing unused storage in SET1. */
static void
merge_variable_sets (set0, set1)
struct variable_set *set0, *set1;
{
register unsigned int bucket1;
for (bucket1 = 0; bucket1 < set1->buckets; ++bucket1)
{
register struct variable *v1 = set1->table[bucket1];
while (v1 != 0)
{
struct variable *next = v1->next;
unsigned int bucket0;
register struct variable *v0;
if (set1->buckets >= set0->buckets)
bucket0 = bucket1;
else
{
register char *n;
bucket0 = 0;
for (n = v1->name; *n != '\0'; ++n)
HASH (bucket0, *n);
}
bucket0 %= set0->buckets;
for (v0 = set0->table[bucket0]; v0 != 0; v0 = v0->next)
if (streq (v0->name, v1->name))
break;
if (v0 == 0)
{
/* There is no variable in SET0 with the same name. */
v1->next = set0->table[bucket0];
set0->table[bucket0] = v1;
}
else
{
/* The same variable exists in both sets.
SET0 takes precedence. */
free (v1->value);
free ((char *) v1);
}
v1 = next;
}
}
}
/* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */
void
merge_variable_set_lists (setlist0, setlist1)
struct variable_set_list **setlist0, *setlist1;
{
register struct variable_set_list *list0 = *setlist0;
struct variable_set_list *last0 = 0;
while (setlist1 != 0 && list0 != 0)
{
struct variable_set_list *next = setlist1;
setlist1 = setlist1->next;
merge_variable_sets (list0->set, next->set);
last0 = list0;
list0 = list0->next;
}
if (setlist1 != 0)
{
if (last0 == 0)
*setlist0 = setlist1;
else
last0->next = setlist1;
}
}
/* Define the automatic variables, and record the addresses
of their structures so we can change their values quickly. */
void
define_automatic_variables ()
{
#ifdef WINDOWS32
extern char* default_shell;
#else
extern char default_shell[];
#endif
register struct variable *v;
char buf[200];
sprintf (buf, "%u", makelevel);
(void) define_variable ("MAKELEVEL", 9, buf, o_env, 0);
sprintf (buf, "%s%s%s",
version_string,
(remote_description == 0 || remote_description[0] == '\0')
? "" : "-",
(remote_description == 0 || remote_description[0] == '\0')
? "" : remote_description);
(void) define_variable ("MAKE_VERSION", 12, buf, o_default, 0);
#ifdef __MSDOS__
/* Allow to specify a special shell just for Make,
and use $COMSPEC as the default $SHELL when appropriate. */
{
static char shell_str[] = "SHELL";
const int shlen = sizeof (shell_str) - 1;
struct variable *mshp = lookup_variable ("MAKESHELL", 9);
struct variable *comp = lookup_variable ("COMSPEC", 7);
/* Make $MAKESHELL override $SHELL even if -e is in effect. */
if (mshp)
(void) define_variable (shell_str, shlen,
mshp->value, o_env_override, 0);
else if (comp)
{
/* $COMSPEC shouldn't override $SHELL. */
struct variable *shp = lookup_variable (shell_str, shlen);
if (!shp)
(void) define_variable (shell_str, shlen, comp->value, o_env, 0);
}
}
#endif
/* This won't override any definition, but it
will provide one if there isn't one there. */
v = define_variable ("SHELL", 5, default_shell, o_default, 0);
v->export = v_export; /* Always export SHELL. */
/* On MSDOS we do use SHELL from environment, since
it isn't a standard environment variable on MSDOS,
so whoever sets it, does that on purpose. */
#ifndef __MSDOS__
/* Don't let SHELL come from the environment. */
if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override)
{
free (v->value);
v->origin = o_file;
v->value = xstrdup (default_shell);
}
#endif
/* Make sure MAKEFILES gets exported if it is set. */
v = define_variable ("MAKEFILES", 9, "", o_default, 0);
v->export = v_ifset;
/* Define the magic D and F variables in terms of
the automatic variables they are variations of. */
#ifdef VMS
define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
define_variable ("*D", 2, "$(dir $*)", o_automatic, 1);
define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
#else
define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
define_variable ("*D", 2, "$(patsubst %/,%,$(dir $*))", o_automatic, 1);
define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
#endif
define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
define_variable ("*F", 2, "$(notdir $*)", o_automatic, 1);
define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
}
int export_all_variables;
/* Create a new environment for FILE's commands.
If FILE is nil, this is for the `shell' function.
The child's MAKELEVEL variable is incremented. */
char **
target_environment (file)
struct file *file;
{
struct variable_set_list *set_list;
register struct variable_set_list *s;
struct variable_bucket
{
struct variable_bucket *next;
struct variable *variable;
};
struct variable_bucket **table;
unsigned int buckets;
register unsigned int i;
register unsigned nvariables;
char **result;
unsigned int mklev_hash;
if (file == 0)
set_list = current_variable_set_list;
else
set_list = file->variables;
/* Find the lowest number of buckets in any set in the list. */
s = set_list;
buckets = s->set->buckets;
for (s = s->next; s != 0; s = s->next)
if (s->set->buckets < buckets)
buckets = s->set->buckets;
/* Find the hash value of the bucket `MAKELEVEL' will fall into. */
{
char *p = "MAKELEVEL";
mklev_hash = 0;
while (*p != '\0')
HASH (mklev_hash, *p++);
}
/* Temporarily allocate a table with that many buckets. */
table = (struct variable_bucket **)
alloca (buckets * sizeof (struct variable_bucket *));
bzero ((char *) table, buckets * sizeof (struct variable_bucket *));
/* Run through all the variable sets in the list,
accumulating variables in TABLE. */
nvariables = 0;
for (s = set_list; s != 0; s = s->next)
{
register struct variable_set *set = s->set;
for (i = 0; i < set->buckets; ++i)
{
register struct variable *v;
for (v = set->table[i]; v != 0; v = v->next)
{
unsigned int j = i % buckets;
register struct variable_bucket *ov;
register char *p = v->name;
if (i == mklev_hash % set->buckets
&& streq (v->name, "MAKELEVEL"))
/* Don't include MAKELEVEL because it will be
added specially at the end. */
continue;
/* If this is a per-target variable and it hasn't been touched
already then look up the global version and take its export
value. */
if (v->per_target && v->export == v_default)
{
struct variable *gv;
gv = lookup_variable_in_set(v->name, strlen(v->name),
&global_variable_set);
if (gv)
v->export = gv->export;
}
switch (v->export)
{
case v_default:
if (v->origin == o_default || v->origin == o_automatic)
/* Only export default variables by explicit request. */
continue;
if (! export_all_variables
&& v->origin != o_command
&& v->origin != o_env && v->origin != o_env_override)
continue;
if (*p != '_' && (*p < 'A' || *p > 'Z')
&& (*p < 'a' || *p > 'z'))
continue;
for (++p; *p != '\0'; ++p)
if (*p != '_' && (*p < 'a' || *p > 'z')
&& (*p < 'A' || *p > 'Z') && (*p < '0' || *p > '9'))
continue;
if (*p != '\0')
continue;
break;
case v_export:
break;
case v_noexport:
continue;
case v_ifset:
if (v->origin == o_default)
continue;
break;
}
/* If this was from a different-sized hash table, then
recalculate the bucket it goes in. */
if (set->buckets != buckets)
{
register char *np;
j = 0;
for (np = v->name; *np != '\0'; ++np)
HASH (j, *np);
j %= buckets;
}
for (ov = table[j]; ov != 0; ov = ov->next)
if (streq (v->name, ov->variable->name))
break;
if (ov == 0)
{
register struct variable_bucket *entry;
entry = (struct variable_bucket *)
alloca (sizeof (struct variable_bucket));
entry->next = table[j];
entry->variable = v;
table[j] = entry;
++nvariables;
}
}
}
}
result = (char **) xmalloc ((nvariables + 2) * sizeof (char *));
nvariables = 0;
for (i = 0; i < buckets; ++i)
{
register struct variable_bucket *b;
for (b = table[i]; b != 0; b = b->next)
{
register struct variable *v = b->variable;
/* If V is recursively expanded and didn't come from the environment,
expand its value. If it came from the environment, it should
go back into the environment unchanged. */
if (v->recursive
&& v->origin != o_env && v->origin != o_env_override)
{
char *value = recursively_expand (v);
#ifdef WINDOWS32
if (strcmp(v->name, "Path") == 0 ||
strcmp(v->name, "PATH") == 0)
convert_Path_to_windows32(value, ';');
#endif
result[nvariables++] = concat (v->name, "=", value);
free (value);
}
else
#ifdef WINDOWS32
{
if (strcmp(v->name, "Path") == 0 ||
strcmp(v->name, "PATH") == 0)
convert_Path_to_windows32(v->value, ';');
result[nvariables++] = concat (v->name, "=", v->value);
}
#else
result[nvariables++] = concat (v->name, "=", v->value);
#endif
}
}
result[nvariables] = (char *) xmalloc (100);
(void) sprintf (result[nvariables], "MAKELEVEL=%u", makelevel + 1);
result[++nvariables] = 0;
return result;
}
/* Try to interpret LINE (a null-terminated string) as a variable definition.
ORIGIN may be o_file, o_override, o_env, o_env_override,
or o_command specifying that the variable definition comes
from a makefile, an override directive, the environment with
or without the -e switch, or the command line.
See the comments for parse_variable_definition().
If LINE was recognized as a variable definition, a pointer to its `struct
variable' is returned. If LINE is not a variable definition, NULL is
returned. */
struct variable *
try_variable_definition (flocp, line, origin, target_var)
const struct floc *flocp;
char *line;
enum variable_origin origin;
int target_var;
{
register int c;
register char *p = line;
register char *beg;
register char *end;
enum { f_bogus,
f_simple, f_recursive, f_append, f_conditional } flavor = f_bogus;
char *name, *expanded_name, *value, *alloc_value=NULL;
struct variable *v;
int append = 0;
while (1)
{
c = *p++;
if (c == '\0' || c == '#')
return 0;
if (c == '=')
{
end = p - 1;
flavor = f_recursive;
break;
}
else if (c == ':')
if (*p == '=')
{
end = p++ - 1;
flavor = f_simple;
break;
}
else
/* A colon other than := is a rule line, not a variable defn. */
return 0;
else if (c == '+' && *p == '=')
{
end = p++ - 1;
flavor = f_append;
break;
}
else if (c == '?' && *p == '=')
{
end = p++ - 1;
flavor = f_conditional;
break;
}
else if (c == '$')
{
/* This might begin a variable expansion reference. Make sure we
don't misrecognize chars inside the reference as =, := or +=. */
char closeparen;
int count;
c = *p++;
if (c == '(')
closeparen = ')';
else if (c == '{')
closeparen = '}';
else
continue; /* Nope. */
/* P now points past the opening paren or brace.
Count parens or braces until it is matched. */
count = 0;
for (; *p != '\0'; ++p)
{
if (*p == c)
++count;
else if (*p == closeparen && --count < 0)
{
++p;
break;
}
}
}
}
beg = next_token (line);
while (end > beg && isblank ((unsigned char)end[-1]))
--end;
p = next_token (p);
/* Expand the name, so "$(foo)bar = baz" works. */
name = (char *) alloca (end - beg + 1);
bcopy (beg, name, end - beg);
name[end - beg] = '\0';
expanded_name = allocated_variable_expand (name);
if (expanded_name[0] == '\0')
fatal (flocp, _("empty variable name"));
/* Calculate the variable's new value in VALUE. */
switch (flavor)
{
case f_bogus:
/* Should not be possible. */
abort ();
case f_simple:
/* A simple variable definition "var := value". Expand the value.
We have to allocate memory since otherwise it'll clobber the
variable buffer, and we may still need that if we're looking at a
target-specific variable. */
value = alloc_value = allocated_variable_expand (p);
break;
case f_conditional:
/* A conditional variable definition "var ?= value".
The value is set IFF the variable is not defined yet. */
v = lookup_variable(expanded_name, strlen(expanded_name));
if (v)
{
free(expanded_name);
return v;
}
flavor = f_recursive;
/* FALLTHROUGH */
case f_recursive:
/* A recursive variable definition "var = value".
The value is used verbatim. */
value = p;
break;
case f_append:
/* If we have += but we're in a target variable context, defer the
append until the context expansion. */
if (target_var)
{
append = 1;
flavor = f_recursive;
value = p;
break;
}
/* An appending variable definition "var += value".
Extract the old value and append the new one. */
v = lookup_variable (expanded_name, strlen (expanded_name));
if (v == 0)
{
/* There was no old value.
This becomes a normal recursive definition. */
value = p;
flavor = f_recursive;
}
else
{
/* Paste the old and new values together in VALUE. */
unsigned int oldlen, newlen;
if (v->recursive)
/* The previous definition of the variable was recursive.
The new value comes from the unexpanded old and new values. */
flavor = f_recursive;
else
/* The previous definition of the variable was simple.
The new value comes from the old value, which was expanded
when it was set; and from the expanded new value. Allocate
memory for the expansion as we may still need the rest of the
buffer if we're looking at a target-specific variable. */
p = alloc_value = allocated_variable_expand (p);
oldlen = strlen (v->value);
newlen = strlen (p);
value = (char *) alloca (oldlen + 1 + newlen + 1);
bcopy (v->value, value, oldlen);
value[oldlen] = ' ';
bcopy (p, &value[oldlen + 1], newlen + 1);
}
}
#ifdef __MSDOS__
/* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
non-Unix systems don't conform to this default configuration (in
fact, most of them don't even have `/bin'). On the other hand,
$SHELL in the environment, if set, points to the real pathname of
the shell.
Therefore, we generally won't let lines like "SHELL=/bin/sh" from
the Makefile override $SHELL from the environment. But first, we
look for the basename of the shell in the directory where SHELL=
points, and along the $PATH; if it is found in any of these places,
we define $SHELL to be the actual pathname of the shell. Thus, if
you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
defining SHELL to be "d:/unix/bash.exe". */
if ((origin == o_file || origin == o_override)
&& strcmp (expanded_name, "SHELL") == 0)
{
char shellpath[PATH_MAX];
extern char * __dosexec_find_on_path (const char *, char *[], char *);
/* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
if (__dosexec_find_on_path (value, (char **)0, shellpath))
{
char *p;
for (p = shellpath; *p; p++)
{
if (*p == '\\')
*p = '/';
}
v = define_variable_loc (expanded_name, strlen (expanded_name),
shellpath, origin, flavor == f_recursive,
flocp);
}
else
{
char *shellbase, *bslash;
struct variable *pathv = lookup_variable ("PATH", 4);
char *path_string;
char *fake_env[2];
size_t pathlen = 0;
shellbase = strrchr (value, '/');
bslash = strrchr (value, '\\');
if (!shellbase || bslash > shellbase)
shellbase = bslash;
if (!shellbase && value[1] == ':')
shellbase = value + 1;
if (shellbase)
shellbase++;
else
shellbase = value;
/* Search for the basename of the shell (with standard
executable extensions) along the $PATH. */
if (pathv)
pathlen = strlen (pathv->value);
path_string = (char *)xmalloc (5 + pathlen + 2 + 1);
/* On MSDOS, current directory is considered as part of $PATH. */
sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
fake_env[0] = path_string;
fake_env[1] = (char *)0;
if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
{
char *p;
for (p = shellpath; *p; p++)
{
if (*p == '\\')
*p = '/';
}
v = define_variable_loc (expanded_name, strlen (expanded_name),
shellpath, origin,
flavor == f_recursive, flocp);
}
else
v = lookup_variable (expanded_name, strlen (expanded_name));
free (path_string);
}
}
else
#endif /* __MSDOS__ */
#ifdef WINDOWS32
if ((origin == o_file || origin == o_override)
&& strcmp (expanded_name, "SHELL") == 0) {
extern char* default_shell;
/*
* Call shell locator function. If it returns TRUE, then
* set no_default_sh_exe to indicate sh was found and
* set new value for SHELL variable.
*/
if (find_and_set_default_shell(value)) {
v = define_variable_loc (expanded_name, strlen (expanded_name),
default_shell, origin, flavor == f_recursive,
flocp);
no_default_sh_exe = 0;
}
} else
#endif
v = define_variable_loc (expanded_name, strlen (expanded_name), value,
origin, flavor == f_recursive, flocp);
v->append = append;
if (alloc_value)
free (alloc_value);
free (expanded_name);
return v;
}
/* Print information for variable V, prefixing it with PREFIX. */
static void
print_variable (v, prefix)
register struct variable *v;
char *prefix;
{
const char *origin;
switch (v->origin)
{
case o_default:
origin = _("default");
break;
case o_env:
origin = _("environment");
break;
case o_file:
origin = _("makefile");
break;
case o_env_override:
origin = _("environment under -e");
break;
case o_command:
origin = _("command line");
break;
case o_override:
origin = _("`override' directive");
break;
case o_automatic:
origin = _("automatic");
break;
case o_invalid:
default:
abort ();
}
fputs ("# ", stdout);
fputs (origin, stdout);
if (v->fileinfo.filenm)
printf (" (from `%s', line %lu)", v->fileinfo.filenm, v->fileinfo.lineno);
putchar ('\n');
fputs (prefix, stdout);
/* Is this a `define'? */
if (v->recursive && strchr (v->value, '\n') != 0)
printf ("define %s\n%s\nendef\n", v->name, v->value);
else
{
register char *p;
printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
/* Check if the value is just whitespace. */
p = next_token (v->value);
if (p != v->value && *p == '\0')
/* All whitespace. */
printf ("$(subst ,,%s)", v->value);
else if (v->recursive)
fputs (v->value, stdout);
else
/* Double up dollar signs. */
for (p = v->value; *p != '\0'; ++p)
{
if (*p == '$')
putchar ('$');
putchar (*p);
}
putchar ('\n');
}
}
/* Print all the variables in SET. PREFIX is printed before
the actual variable definitions (everything else is comments). */
void
print_variable_set (set, prefix)
register struct variable_set *set;
char *prefix;
{
register unsigned int i, nvariables, per_bucket;
register struct variable *v;
per_bucket = nvariables = 0;
for (i = 0; i < set->buckets; ++i)
{
register unsigned int this_bucket = 0;
for (v = set->table[i]; v != 0; v = v->next)
{
++this_bucket;
print_variable (v, prefix);
}
nvariables += this_bucket;
if (this_bucket > per_bucket)
per_bucket = this_bucket;
}
if (nvariables == 0)
puts (_("# No variables."));
else
{
printf (_("# %u variables in %u hash buckets.\n"),
nvariables, set->buckets);
#ifndef NO_FLOAT
printf (_("# average of %.1f variables per bucket, \
max %u in one bucket.\n"),
(double) nvariables / (double) set->buckets,
per_bucket);
#else
{
int f = (nvariables * 1000 + 5) / set->buckets;
printf (_("# average of %d.%d variables per bucket, \
max %u in one bucket.\n"),
f/10, f%10,
per_bucket);
}
#endif
}
}
/* Print the data base of variables. */
void
print_variable_data_base ()
{
puts (_("\n# Variables\n"));
print_variable_set (&global_variable_set, "");
}
/* Print all the local variables of FILE. */
void
print_file_variables (file)
struct file *file;
{
if (file->variables != 0)
print_variable_set (file->variables->set, "# ");
}
#ifdef WINDOWS32
void
sync_Path_environment(void)
{
char* path = allocated_variable_expand("$(Path)");
static char* environ_path = NULL;
if (!path)
return;
/*
* If done this before, don't leak memory unnecessarily.
* Free the previous entry before allocating new one.
*/
if (environ_path)
free(environ_path);
/*
* Create something WINDOWS32 world can grok
*/
convert_Path_to_windows32(path, ';');
environ_path = concat("Path", "=", path);
putenv(environ_path);
free(path);
}
#endif