automake: Subdirectories with AC_SUBST
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1 7.2.3 Subdirectories with ‘AC_SUBST’
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1 Another possibility is to define ‘MAYBE_OPT’ from ‘./configure’ using
1 ‘AC_SUBST’:
1
1 ...
1 if test "$want_opt" = yes; then
1 MAYBE_OPT=opt
1 else
1 MAYBE_OPT=
1 fi
1 AC_SUBST([MAYBE_OPT])
1 AC_CONFIG_FILES([Makefile src/Makefile opt/Makefile])
1 ...
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1 In this case the top-level ‘Makefile.am’ should look as follows.
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1 SUBDIRS = src $(MAYBE_OPT)
1 DIST_SUBDIRS = src opt
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1 The drawback is that since Automake cannot guess what the possible
1 values of ‘MAYBE_OPT’ are, it is necessary to define ‘DIST_SUBDIRS’.
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