Dir.sd.mk: Prevent builtin make rule overwriting conffile.c

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/Dir.sd.mk b/Dir.sd.mk
index 4f16b25572c1cc0e06529d52bc8bc89a807c2b96..d65cc92e55963d8388ed00244c2e8ab928c1c600 100644 (file)
--- a/Dir.sd.mk
+++ b/Dir.sd.mk
@@ -78,6 +78,12 @@ STALE_PYTHON_FILES=  $(foreach e, py pyc, \
 %.yy.c %.yy.h: %.fl
        flex --header=$*.yy.h -o$*.yy.c $<
 
+%.c: %.y
+# make has a builtin rule to run yacc, but we don't want that because
+# our conffile.c is handwritten, and we use conffile.yy.c for the
+# bison output.  There is no need to do likewise for flex because
+# our flex input files are end in .fl, not .l.
+
 %.tab.c %.tab.h:       %.y
        bison -d -o $@ $<