Re: makefile compilation question

[timesir via Tech-talk <tech-talk at aps.anl.gov>]

hello,

    I still don't understand it very well, please explain it in detail. Especially 

beforeActions = $(addprefix before-,$(ACTIONS))
$(beforeActions):
$(ARCHS) $(ACTIONS) $(actionArchTargets) :%: \
    $(foreach dir, $(DIRS), $(dir)$(DIVIDER)%)

NICOLE Remi via Tech-talk <tech-talk at aps.anl.gov> 于2023年5月22日周一 19:23写道：

Hey there!

From my understanding:

In epics-base/configure/RULES_DIR, you will find:

    $(DIRS) $(dirActionTargets) $(dirArchTargets)
$(dirActionArchTargets):
        $(MAKE) -C $(dirPart) $(actionArchPart)

which makes it so that 'make myApp.install' will run 'make -C myApp
install'.

and

    $(ARCHS) $(ACTIONS) $(actionArchTargets) :%: \
        $(foreach dir, $(DIRS), $(dir)$(DIVIDER)%)

will make it so that 'install' depends on every '$(dir).install'

Then, in epics-base/configure/RULES, it includes RULES_ARCH, which
conceptually "splits" the build for every wanted architecture, which
then re-includes RULES but the second time, it goes into RULES_BUILD,
which defines rules for building libraries, executables, and so on for
the specified architecture (T_A).

Hope it helps.

--
Rémi NICOLE <remi.nicole at cea.fr>
CEA/DRF/IRFU/DIS/LDISC