maint: avoid using find -name Makefile.am; could get false positives

* maint.mk (makefile-check): Instead, search for the offending
@...@ construct only in version-controlled files.

diff --git a/maint.mk b/maint.mk
index f3bbf9afadfe0c50534d2db320c6ad4402a40835..2987272fb050ab256cff740ef44052ad201027ed 100644 (file)
--- a/maint.mk
+++ b/maint.mk
@@ -551,7 +551,8 @@ check-AUTHORS:
 # not @...@ in Makefile.am, now that we can rely on automake
 # to emit a definition for each substituted variable.
 makefile-check:
-       @grep -nE '@[A-Z_0-9]+@' `find . -name Makefile.am` \
+       @grep -nE '@[A-Z_0-9]+@'                                        \
+           $$($(VC_LIST_EXCEPT) | grep -E '(^|/)Makefile\.am$$')       \
          && { echo '$(ME): use $$(...), not @...@' 1>&2; exit 1; } || :
 
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