# Copyright © 2011-2012 Nick Bowler
#
# Prepare the Gnulib tree for inclusion into a non-recursive automake build.
+# While the output of gnulib-tool is "include"-able if the --makefile-name
+# option is used, it is still not suitable for non-recursive use for a couple
+# reasons; chief among them is that filenames are not relative to the top
+# source directory.
+#
+# This script postprocesses the gnulib-tool output to produce something that
+# is intended to be suitable for inclusion into such non-recursive build
+# environments. Since the integration involves both configure.ac and
+# Makefile.am, the output must be included into _both_. Supposing the output
+# is written to lib/gnulib.mk, you would add:
+#
+# m4_include([lib/gnulib.mk]) # to configure.ac, after any call to gl_INIT
+# include $(top_srcdir)/lib/gnulib.mk # to Makefile.am
+#
+# You must also arrange for the Gnulib-generated header files to be built
+# before the object files which depend on them; the most robust way to do this
+# is by explicit prerequisites, for example:
+#
+# bin_PROGRAMS = foo
+# $(foo_OBJECTS): $(gnulib_headers)
+#
+# The $(gnulib_headers) variable will expand to GNU-make order-only
+# prerequisites when available, avoiding spurious incremental rebuilds when
+# unused headers are changed. If this feature is not available, it will
+# expand to ordinary prerequisites. It is therefore only appropriate for use
+# in target prerequisites; the $(gnulib_raw_headers) variable may be used in
+# other contexts when only the list of header files is required.
+#
+# This script also provides machinery for Gnulib symbol renaming via the
+# glconfig.mk Makefile.am snippet; use of this feature is optional.
+#
+# Most of the specific transformations are documented below.
#
# License WTFPL2: Do What The Fuck You Want To Public License, version 2.
# This is free software: you are free to do what the fuck you want to.
# This trick should define gnulib_orderonly to | iff we're using GNU make.
gnulib_have_orderonly = $(findstring order-only,$(.FEATURES))
gnulib_orderonly = $(gnulib_have_orderonly:order-only=|)
-gnulib_core_headers = $(gnulib_orderonly)
-gnulib_src_headers = $(gnulib_core_headers)
-gnulib_headers = $(gnulib_src_headers)
+gnulib_core_headers =
+gnulib_raw_headers = $(gnulib_core_headers)
+gnulib_headers = $(gnulib_orderonly) $(gnulib_raw_headers)
+
+# Oddly, gnulib tries to add to MOSTLYCLEANDIRS (which is *not* an automake
+# variable) without defining it.
+MOSTLYCLEANDIRS =
EOF
$printed_header = 1;
$_ = mangle_target($_);
}
+ # MKDIR_P commands need to be fixed up; in principle Gnulib could also
+ # be patched here to use $(@D) instead (and thus automatically benefit
+ # from the target being fixed up), but this will do for now.
+ s/^(\t.*\$\(MKDIR_P\)) ([[:alnum:]]+)$/\1 lib\/\2/;
+
# When using conditional-dependencies, *CLEANFILES can end up
# depending on the configuration. This means that "make distclean"
# may not actually delete everything if the configuration changes
# after building the package. Stash all the variables for later so
# they can be moved outside of any conditional.
- if (/CLEANFILES/) {
+ if (/(CLEANFILES|CLEANDIRS)[[:space:]]*\+=/) {
push(@cleanfiles, $_);
drop;
}
print <<'EOF';
gnulib_lt_objects = $(libgnu_la_OBJECTS) $(gl_LTLIBOBJS)
-$(gnulib_lt_objects): $(gnulib_src_headers)
+$(gnulib_lt_objects): $(gnulib_headers)
EOF
print @cleanfiles;
], [dnl M4 code follows
AC_SUBST([GLSRC], [lib])
-AC_DEFUN_ONCE([DX_GLSYM_PREFIX], [AC_SUBST([GLSYM_PREFIX], [$1])])
+
+AC_DEFUN_ONCE([DX_GLSYM_PREFIX], [dnl
+AC_REQUIRE([DX_EXPORTED_SH])
+AC_SUBST([GLSYM_PREFIX], [$1])
+])
AC_CONFIG_COMMANDS_PRE([DX_GLSYM_PREFIX([${PACKAGE}__])])
m4_foreach([gl_objvar], [[gl_LIBOBJS], [gl_LTLIBOBJS]], [dnl