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@@ -0,0 +1,40 @@
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+tokens: fix parallel builds
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+
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+Currently, tokens.h and token_vars.h are each generated by a call to
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+mktokens, which means mktokens is called twice.
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+
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+But mktokens generates both in a single run.
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+
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+This means that, with a fast-enough machine, the call to mktokens that
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+generates tokens.h may finish before the call that generates
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+token_vars.h. Then tokens.h is transiently incomplete (it can even be
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+empty). By the time it is fully generated in the second run, a compile
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+job that ends up using token.h may have already started, and the source
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+file would include an in complete token.h and would be missing some
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+token definitions.
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+
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+We fix that by making token.h a dependency of token_vars.h, with a
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+dummy recipe (to force it not being PHONY). The actual recipe is for
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+token_vars.h
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+
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+Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
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+
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+diff -durN dash-0.5.8.orig/src/Makefile.am dash-0.5.8/src/Makefile.am
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+--- dash-0.5.8.orig/src/Makefile.am 2014-09-28 10:19:32.000000000 +0200
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++++ dash-0.5.8/src/Makefile.am 2017-03-07 09:53:28.579811603 +0100
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+@@ -45,7 +45,14 @@
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+ mktokens mkbuiltins builtins.def.in mkinit.c \
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+ mknodes.c nodetypes nodes.c.pat mksyntax.c mksignames.c
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+
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+-token.h token_vars.h: mktokens
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++# Both token.h and token_vars.h are generated by a single call
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++# to mktokens. However, token.h is the only file that is used
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++# as a dependency, so we must ensure token_vars.h is generated
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++# first.
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++token.h: token_vars.h
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++ @:
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++
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++token_vars.h: mktokens
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+ sh $^
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+
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+ builtins.def: builtins.def.in $(top_builddir)/config.h
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Yann E. MORIN