maint: relax a check so "make distcheck" succeeds again

* maint.mk (makefile-check): Relax the check, in order to exempt
the necessary use of a sole @...@-delimited Makefile.am variable.

diff --git a/maint.mk b/maint.mk
index 2987272..e5d3fee 100644 (file)
--- a/maint.mk
+++ b/maint.mk
@@ -550,8 +550,11 @@ check-AUTHORS:
 # Ensure that we use only the standard $(VAR) notation,
 # not @...@ in Makefile.am, now that we can rely on automake
 # to emit a definition for each substituted variable.
+# We use perl rather than "grep -nE ..." to exempt a single
+# use of an @...@-delimited variable name in src/Makefile.am.
 makefile-check:
-       @grep -nE '@[A-Z_0-9]+@'                                        \
+       @perl -ne '/\@[A-Z_0-9]+\@/ && !/^cu_install_program =/'        \
+         -e 'and (print "$$ARGV:$$.: $$_"), $$m=1; END {exit !$$m}'    \
            $$($(VC_LIST_EXCEPT) | grep -E '(^|/)Makefile\.am$$')       \
          && { echo '$(ME): use $$(...), not @...@' 1>&2; exit 1; } || :