maint.mk: fix syntax checks without exclusions

Commit 727075d0 skipped per-line exclusions if ${exclude} is left
undefined, but was immediately broken by commit 44de969c which
always initialized the variable to the empty string.

* top/maint.mk (_sc_search_regexp): Allow for empty variable.
Reported by Daniel P. Berrange.

Signed-off-by: Eric Blake <eblake@redhat.com>

diff --git a/ChangeLog b/ChangeLog
index 376a5a2..58c4c6d 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-03-29  Eric Blake  <eblake@redhat.com>
 
+       maint.mk: fix syntax checks without exclusions
+       * top/maint.mk (_sc_search_regexp): Allow for empty variable.
+       Reported by Daniel P. Berrange.
+
        strerror_r: avoid compiler warning
        * lib/strerror_r.c (strerror_r): Hoist extern declaration to top
        level.

diff --git a/top/maint.mk b/top/maint.mk
index 951b358..2228a37 100644 (file)
--- a/top/maint.mk
+++ b/top/maint.mk
@@ -279,7 +279,7 @@ define _sc_search_regexp
    if test -n "$$files"; then                                          \
      if test -n "$$prohibit"; then                                     \
        grep $$with_grep_options $(_ignore_case) -nE "$$prohibit" $$files \
-         | grep -vE "$${exclude-^$$}"                                  \
+         | grep -vE "$${exclude:-^$$}"                                 \
          && { msg="$$halt" $(_sc_say_and_exit) } || :;                 \
      else                                                              \
        grep $$with_grep_options $(_ignore_case) -LE "$$require" $$files \