[bug#70169] [PATCH v3 10/13] maint: Avoid EPS generation to fail silently, ensure reproducibility.

[Janneke Nieuwenhuizen <janneke@gnu.org>]

Currently, Graphviz' dot does not insert a %%CreationDate.  ImageMagick's
convert on PNG->EPS does insert a %%CreationDate but it respects
SOURCE_DATE_EPOCH.

* doc/local.mk (.png.eps): Split single shell command into separate recipe
lines, prefixed by $(AM_V_at).
(.dot.png): Likewise.  Check that generated EPS file has no %%CreationDate.

Change-Id: I5a03485c19c72f0c46411815c51290e52a8e5399
---
 doc/local.mk | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/doc/local.mk b/doc/local.mk
index 7a9840187a..e5ee06f6ee 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -152,12 +152,13 @@ DOT_OPTIONS =					\
 	mv "$(srcdir)/$@.tmp" "$(srcdir)/$@"
 
 .dot.eps:
-	$(AM_V_DOT)$(DOT) -Teps $(DOT_OPTIONS) < "$<" > "$(srcdir)/$@.tmp"; \
-	mv "$(srcdir)/$@.tmp" "$(srcdir)/$@"
+	$(AM_V_DOT)$(DOT) -Teps $(DOT_OPTIONS) < "$<" > "$(srcdir)/$@.tmp"
+	$(AM_v_at)! grep -q %%CreationDate "$(srcdir)/$@.tmp"
+	$(AM_V_at)mv "$(srcdir)/$@.tmp" "$@"
 
 .png.eps:
-	$(AM_V_GEN)convert "$<" "$@-tmp.eps"; \
-	mv "$@-tmp.eps" "$@"
+	$(AM_V_GEN)convert "$<" "$@-tmp.eps"
+	$(AM_V_at)mv "$@-tmp.eps" "$@"
 
 # We cannot add new dependencies to `%D%/guix.pdf' & co. (info "(automake)
 # Extending").  Using the `-local' rules is imperfect, because they may be
-- 
2.41.0