buildsys: don't use %.c to in a suffix rule

Suggested by @b4n and @mqudsi in universal-ctags#1554. Signed-off-by: Masatake YAMATO <yamato@redhat.com>
masatake · Feb 2, 2019 · 1b7ccf1 · 1b7ccf1
1 parent 7119e7a
commit 1b7ccf1
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/Makefile.am b/Makefile.am
@@ -99,8 +99,10 @@ optlib2c_verbose = $(optlib2c_verbose_@AM_V@)
 optlib2c_verbose_ = $(optlib2c_verbose_@AM_DEFAULT_V@)
 optlib2c_verbose_0 = @echo OPTLIB2C "  $@";
 OPTLIB2C = $(srcdir)/misc/optlib2c
-%.c: %.ctags $(OPTLIB2C) Makefile
+SUFFIXES += .ctags
+.ctags.c:
 	$(optlib2c_verbose)$(OPTLIB2C) $< > $@
+$(OPTLIB2C_INPUT): $(OPTLIB2C) Makefile
 endif
 dist_ctags_SOURCES = $(ALL_HEADS) $(ALL_SRCS)