[Bug 1000136] New: target.ld make dependencies incomplete, so startup type changes ineffectual

[bugzilla at ecoscentric dot com]

http://bugs.ecos.sourceware.org/show_bug.cgi?id=1000136

           Summary: target.ld make dependencies incomplete, so startup type
                    changes ineffectual
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: normal
         Component: CDL
        AssignedTo: bartv@ecoscentric.com
        ReportedBy: jifl@ecoscentric.com
         QAContact: ecos-bugs@sources.redhat.com


[ Don't know why this isn't already in the bugs db but I can't find it ]

Each architecture (or in some cases, variant) HAL has a custom make rule for
building target.ld, consisting of e.g.
    make {
        <PREFIX>/lib/target.ld: <PACKAGE>/src/powerpc.ld
        $(CC) -E -P -Wp,-MD,target.tmp -DEXTRAS=1 -xc $(INCLUDE_PATH) $(CFLAGS)
-o $@ $<
        @echo $@ ": \\" > $(notdir $@).deps
        @tail -n +2 target.tmp >> $(notdir $@).deps
        @echo >> $(notdir $@).deps
        @rm target.tmp
    }

So target.ld depends on powerpc.ld. However it does _not_ also depend on the
relevant MLT files. So if you change the MLT startup type from e.g. ROM to RAM,
target.ld will not be rebuilt, and bad things happen.

I've put this as a CDL bug because I cannot see any way in current CDL to
express the dependency on the current MLT files, i.e. so that if the MLT file
changes, the dependency gets noticed. Currently generated makefiles have a macro
for all the MLT files, but that's not (just) the issue, as what you want to
notice is when the startup type in the configuration changes, not the files
themselves (which wouldn't have changed just because the config changed).



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