X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=stepmake%2Fstepmake%2Fmetafont-vars.make;h=1e50a183f53e912a9edcb64764177b8c9f8980e9;hb=7719b3925322a347391fc6c5520a1d763695560f;hp=aeb75c5f004cf1ab1da0e78b985dfdd93dab11be;hpb=cb951038d3e74a85ec8539d0dc51260088251556;p=lilypond.git

diff --git a/stepmake/stepmake/metafont-vars.make b/stepmake/stepmake/metafont-vars.make
index aeb75c5f00..1e50a183f5 100644
--- a/stepmake/stepmake/metafont-vars.make
+++ b/stepmake/stepmake/metafont-vars.make
@@ -15,3 +15,25 @@ METAFONT_QUIET = >/dev/null
 else
 METAFONT_QUIET =
 endif
+
+# Find the metafont file $(1) within the source dirs and return its path.
+# If not found, return $(outdir)/$(1) assuming that it is a generated file.
+find-mf = \
+$(firstword \
+	$(wildcard $(src-dir)/$(1)) \
+	$(wildcard $(top-src-dir)/mf/$(1)) \
+	$(outdir)/$(1) \
+)
+
+# Recursively scan the metafont .mf file $(1) for "input X;"
+# and return all dependencies.
+scan-mf = \
+$(foreach f, $(shell test -f $(1) && sed -ne "/^[[:space:]]*input[[:space:]]/s/^[[:space:]]*input\([^.;]*\)\(.mf;\|;\)/\1.mf/p" $(1)), \
+	$(call find-mf,$(f)) \
+	$(call scan-mf,$(call find-mf,$(f))) \
+)
+
+# Find dependencies for the target $@, based on the metafont source file $<,
+# and write the dependencies to a .dep file. We cannot strip the extension of $@,
+# because we have multiple rules generating .dep files.
+DO_MF_DEP = ( echo ./$@: $(call scan-mf,$<) > $@.dep ) &&