examples: fix dependencies

[Akim Demaille]

commit 50285ff06695a8c5d977337f0ede3a4d72aa048d
Author: Akim Demaille <address@hidden>
Date:   Wed Dec 26 08:44:01 2018 +0100

    examples: fix dependencies
    
    Commit 112ccb5ed73ba5c64b0b5300d8b9b686f02f094c moved the skeletons
    from dist_pkgdata_DATA to dist_skeletons_DATA, hence broke the dependencies.
    
    * Makefile.am (dependencies): New.
    Use it where appropriate.

diff --git a/Makefile.am b/Makefile.am
index 6911bc78..4e699383 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,6 +29,13 @@ EXTRA_DIST = .prev-version .version cfg.mk PACKAGING \
 
 dist_doc_DATA = AUTHORS COPYING NEWS README THANKS TODO
 
+# Let generated files (e.g., from exampkles/) depend on this variable,
+# to make sure they are regenerated when there are changes in Bison.
+#
+# Don't depend on $(BISON) otherwise we would rebuild these files
+# in srcdir, including during distcheck, which is forbidden.
+dependencies = $(BISON_IN) $(dist_skeletons_DATA)
+
 ## Running the bison from this tarball.  To generate our own parser,
 ## but also to run the tests.  Of course, you ought to keep a sane
 ## version of Bison nearby...
diff --git a/examples/c++/calc++/local.mk b/examples/c++/calc++/local.mk
index a051ad46..c653bb71 100644
--- a/examples/c++/calc++/local.mk
+++ b/examples/c++/calc++/local.mk
@@ -20,7 +20,7 @@
 
 # Don't depend on $(BISON) otherwise we would rebuild these files
 # in srcdir, including during distcheck, which is forbidden.
-%D%/parser.stamp: $(BISON_IN) $(dist_pkgdata_DATA)
+%D%/parser.stamp: $(dependencies)
 SUFFIXES += .yy .stamp
 .yy.stamp:
        $(AM_V_YACC)rm -f $@
diff --git a/examples/c++/local.mk b/examples/c++/local.mk
index e251276f..5364f375 100644
--- a/examples/c++/local.mk
+++ b/examples/c++/local.mk
@@ -37,7 +37,7 @@ if ENABLE_CXX14
   # Don't use gnulib's system headers.
   %C%_simple_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/simple.test
-  %D%/simple.cc: $(BISON_IN) $(dist_pkgdata_DATA)
+  %D%/simple.cc: $(dependencies)
 endif
 EXTRA_DIST += %D%/simple.test
 
@@ -52,7 +52,7 @@ if ENABLE_CXX
   # Don't use gnulib's system headers.
   %C%_variant_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/variant.test
-  %D%/variant.cc: $(BISON_IN) $(dist_pkgdata_DATA)
+  %D%/variant.cc: $(dependencies)
 endif
 EXTRA_DIST += %D%/variant.test
 
@@ -63,7 +63,7 @@ if ENABLE_CXX11
   # Don't use gnulib's system headers.
   %C%_variant_11_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/variant-11.test
-  %D%/variant-11.cc: $(BISON_IN) $(dist_pkgdata_DATA)
+  %D%/variant-11.cc: $(dependencies)
 endif
 EXTRA_DIST += %D%/variant-11.test
 
diff --git a/examples/d/local.mk b/examples/d/local.mk
index a9f0e2d2..20a8bdf6 100644
--- a/examples/d/local.mk
+++ b/examples/d/local.mk
@@ -25,7 +25,7 @@ if ENABLE_D
 endif
 EXTRA_DIST += %D%/calc.test
 
-%D%/calc.d: %D%/calc.y $(BISON_IN) $(dist_pkgdata_DATA)
+%D%/calc.d: %D%/calc.y $(dependencies)
        $(AM_V_GEN)$(MKDIR_P) %D%
        $(AM_V_at)$(BISON) $< -o $@
 
diff --git a/examples/java/local.mk b/examples/java/local.mk
index 9582bfce..b7c7e812 100644
--- a/examples/java/local.mk
+++ b/examples/java/local.mk
@@ -25,7 +25,7 @@ if ENABLE_JAVA
 endif
 EXTRA_DIST += %D%/Calc.test
 
-%D%/Calc.java: %D%/Calc.y $(BISON_IN) $(dist_pkgdata_DATA)
+%D%/Calc.java: %D%/Calc.y $(dependencies)
        $(AM_V_GEN)$(MKDIR_P) %D%
        $(AM_V_at)$(BISON) $< -o $@