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Implement the 'always' function.

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[SVN r57842]
This commit is contained in:
Vladimir Prus
2009-11-22 08:05:36 +00:00
parent ead21a5a4b
commit 1eb2466876
3 changed files with 57 additions and 2 deletions
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20
doc/src/reference.xml
View File

@@ -181,6 +181,26 @@ ECHO [ glob-tree *.cpp : .svn ] ;
their containing project is built.</para></listitem>
</varlistentry>
<varlistentry>
<term><literal>always</literal></term>
<indexterm><primary>always building a metatarget</primary></indexterm>
<listitem><para>The <literal>always</literal> funciton takes a single
parameter&#x2014;a list of metatarget names. The top-level targets produced
by the named metatargets will be always considered out of date. Consider this example:
</para>
<programlisting>
exe hello : hello.cpp ;
exe bye : bye.cpp ;
always hello ;
</programlisting>
<para>If a build of <filename>hello</filename> is requested, then the binary will
always be relinked. The object files will not be recompiled, though. Note that if
a build of <filename>hello</filename> is not requested, for example you specify just
<filename>bye</filename> on the command line, <filename>hello</filename> will not
be relinked.</para></listitem>
</varlistentry>
<varlistentry>
<term><literal>constant</literal></term>

10
src/build/project.jam
View File

@@ -1035,6 +1035,16 @@ module project-rules
}
}
rule always ( target-names * )
{
import project ;
local t = [ project.current ] ;
for local n in $(target-names)
{
$(t).mark-target-as-always $(n) ;
}
}
rule glob ( wildcards + : excludes * )
{
import project ;

29
src/build/targets.jam
View File

@@ -303,6 +303,13 @@ class project-target : abstract-target
# before main target instances are created.
self.explicit-targets += $(target-name) ;
}
rule mark-target-as-always ( target-name )
{
# Record the name of the target, not instance, since this rule is called
# before main target instances are created.
self.always-targets += $(target-name) ;
}
# Add new target alternative
#
@@ -466,6 +473,11 @@ class project-target : abstract-target
self.main-targets += $(t) ;
target = $(self.main-target.$(name)) ;
}
if $(name) in $(self.always-targets)
{
$(a).always ;
}
$(target).add-alternative $(a) ;
}
@@ -1100,7 +1112,12 @@ class basic-target : abstract-target
[ full-name ] ;
}
}
rule always ( )
{
self.always = 1 ;
}
# Returns the list of abstract-targets which are used as sources. The extra
# properties specified for sources are not represented. The only user for
# this rule at the moment is the "--dump-tests" feature of the test system.
@@ -1267,7 +1284,15 @@ class basic-target : abstract-target
{
local gur = $(result[1]) ;
result = $(result[2-]) ;
if $(self.always)
{
for local t in $(result)
{
$(t).always ;
}
}
local s = [ create-subvariant $(result)
: [ virtual-target.recent-targets ]
: $(property-set) : $(source-targets)