[Boost-build] implicit dependency not working !?

Subject: [Boost-build] implicit dependency not working !?
From: Meindert Oldenburger (meindert66_at_[hidden])
Date: 2011-09-14 06:07:31

An implicit dependency to version_o, in libgen project, does not result in
an include statement during compilation of .c files.

When i make a "implicit-dependency" to version.h it is working, but then i
become static and dynamic headers, and then i have to rebuild the whole
project twice before everything is compiled and linked.

Is there some special with "implicit-dependency" ? Sometimes bjam is hard to
understand.

WORKAROUND possibilities: Is there a possibility to ask the build directory
path, where versio.* are compiled, then i could do: obj version_o  :
version.c : <cflags>-fPIC <link>static : : <include> BUILDDIR ;
and then using:  <use>../version//version_o in libgen.

Regards,
Meindert

########### version PROJECT
#
# This project generates version.c version.h version_o.o
#
##########
exe genversion : genversion.c : <define>VERSIONDIR=. ;

#make version.h : genversion version.$(CURBU).def : @make_version_c_h ;

make version.c : genversion version.$(CURBU).def : @make_version_c_h ;
actions make_version_c_h { $(>[1]) -p $(>[1]:P) -d $(>[2]) }

# only make the static version
obj version_o  : version.c : <cflags>-fPIC <link>static ;

########### gen PROJECT
#
# Just a generic lib
#
#############################
project
: requirements
        <toolset>msvc:<linkflags>"/NODEFAULTLIB:libcmt.lib
/NODEFAULTLIB:libcmtd.lib"
        <implicit-dependency>../etc/rms//messages.h
        <include>../include
;

alias gen_src
:
        util/geninit.c
        util/thread.c

        ../version//version_o

        and//and
        cdt//cdt
        frm//frm
        licence//licence
        mm//mm
        mon//mon
        pref//pref
        proc//proc
        regex//regex
        rms//rms
        util//util
        xml//xml
        # TODO why is a part of gen build somewhere else ?
        ../api/wfd//wfd
:
        <use>/site-config//LIBXML2
        <use>/site-config//LIBZLIB
#       <implicit-dependency>../version//version_o
: :
        <source>/site-config//LIBXML2
;

lib gen_static
:
        gen_src
:
        <link>static
        <implicit-dependency>../version//version_o
: :
        # for external source, because gen also needs xml2
        <source>/site-config//LIBZLIB
;

lib gen
:
        gen_src
:
        <implicit-dependency>../version//version_o
        <def-file>gen.def
        <use>/site-config//LIBZLIB/<runtime-link>shared
: :

;