FreeBSD make fails on BUILT_SOURCES file

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Subject: FreeBSD make fails on BUILT_SOURCES file
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Hi All.

As maintainer of the Hamlib project I am working on a reported issue
involving the installed version of make in the distribution.  I have
verified the issue locally.  The failure is:

Making all in src
make[1]: don't know how to make ./hamlibdatetime.h. Stop

make[1]: stopped in /home/larry/Hamlib/src
*** Error code 1

Stop.


Which doesn't leave a lot to go on.  I've used various debugging queries
of this make but it simply never processes the rule as near as I can
determine.  It's as though this make doesn't see a valid rule stanza.

In our Makefile.am (https://github.com/Hamlib/Hamlib/blob/master/src/Makefi=
le.am)
there is the line:

BUILT_SOURCES =3D $(builddir)/hamlibdatetime.h

hamlibdatetime.h is also first in the variable that holds all of the
source files for this directory.

Further down is the rule:

# If we have  a .git directory then we will  generate the hamlibdate.h
# file and  replace it if it  is different. Fall  back to a copy  of a
# generic hamlibdatetime.h.in in the source tree. Build looks in build
# directory  before  the  source directory  for  the  hamlibdatetime.h
# header.
hamlibdatetime.h: FORCE
	@if test -x $(top_srcdir)/.git ; then \
		echo "/* This date time is from the last non-merge commit to Hamlib. */" =
> $(builddir)/$(@F).tmp ;\
		echo "#define HAMLIBDATETIME "\"$$(TZ=3DUTC git --git-dir=3D$(top_srcdir)=
/.git log --no-merges --date=3D'format-local:%Y-%m-%dT%H:%M:%SZ SHA=3D' --f=
ormat=3D'%cd' -n 1)$$(git --git-dir=3D$(top_srcdir)/.git log --no-merges -n=
 1 | head -n 1 | cut -c8-13)\"  >> $(builddir)/$(@F).tmp ;\
		diff -qN $(builddir)/$(@F).tmp $(builddir)/$(@F) ; test $$? -eq 0 || { ec=
ho "Generating SCS header \"$(builddir)/$(@F)\"" ; mv -f $(builddir)/$(@F).=
tmp $(builddir)/$(@F) ; } ;\
		rm -f $(builddir)/$(@F).tmp ;\
		touch -c $(top_srcdir)/src/version_dll.rc ;\
	else \
		test -f $(srcdir)/$(@F) || cp $(srcdir)/$(@F).in $(srcdir)/$(@F) ;\
	fi

snapshot_data.o rig.o: hamlibdatetime.h


This all works as expected with GNU make on various platforms.  Other
than recommending GNU make to the reporter, is there something we're
missing?

I can supply the Makefile from FreeBSD upon request, if that helps.

- Nate

--=20
"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."
Web: https://www.n0nb.us
Projects: https://github.com/N0NB
GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819


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