From b70215dfee4aeb9f530a104e348ce2c28e97add6 Mon Sep 17 00:00:00 2001
From: David Levine <levinedl@acm.org>
Date: Thu, 12 Jan 2012 22:14:59 -0600
Subject: [PATCH] Added -Wunused-macros with gcc, if supported.  Added
 -Wno-unused-macros, if supported, to compile of
 sbr/dtimep.o with gcc because it uses generated code that
 would be too much trouble to clean up.

---
 configure.ac    |   17 ++++++++++++++++-
 sbr/Makefile.in |    6 ++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 43a1029..28821ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -218,6 +218,20 @@ fi
 
 AC_PROG_CC
 
+AC_CACHE_CHECK(whether preprocessor supports -Wunused-macros,
+  nmh_cv_has_unusedmacros,
+  [nmh_saved_cppflags="$CPPFLAGS"
+   CPPFLAGS="$CPPFLAGS -Wunused-macros -Wno-unused-macros"
+   AC_TRY_COMPILE([],[],nmh_cv_has_unusedmacros=yes,nmh_cv_has_unusedmacros=no)
+   CPPFLAGS="$nmh_saved_cppflags"])
+
+if test "$nmh_cv_has_unusedmacros" = 'yes'; then
+  test -z "$CPPLAGS"  &&  CPPFLAGS=-Wunused-macros \
+                      ||  CPPFLAGS="$CPPFLAGS -Wunused-macros"
+  DISABLE_UNUSED_MACROS_WARNING=-Wno-unused-macros
+fi
+AC_SUBST(DISABLE_UNUSED_MACROS_WARNING)dnl
+
 AC_CACHE_CHECK(whether compiler supports -Wno-pointer-sign, nmh_cv_has_noptrsign,
 [nmh_saved_cflags="$CFLAGS"
  CFLAGS="$CFLAGS -Wno-pointer-sign"
@@ -456,7 +470,8 @@ dnl before system header files.
 case "$target_os" in
   linux*)
     # Like DEFS, but doesn't get stomped on by configure when using config.h:
-    OURDEFS="$OURDEFS -D_GNU_SOURCE"
+    test -z "$OURDEFS"  &&  OURDEFS="-D_GNU_SOURCE"  \
+                        ||  OURDEFS="$OURDEFS -D_GNU_SOURCE"
     ;;
 esac
 AC_SUBST(OURDEFS)
diff --git a/sbr/Makefile.in b/sbr/Makefile.in
index 555d031..c949469 100644
--- a/sbr/Makefile.in
+++ b/sbr/Makefile.in
@@ -16,6 +16,7 @@ etcdir      = @sysconfdir@
 
 CC       = @CC@
 CFLAGS   = @CFLAGS@
+DISABLE_UNUSED_MACROS_WARNING = @DISABLE_UNUSED_MACROS_WARNING@
 DEFS     = @DEFS@
 CONFIGDEFS = -DNMHETCDIR='"$(etcdir)"' -DMAILSPOOL='"$(mailspool)"' -DSENDMAILPATH='"$(sendmailpath)"'
 INCLUDES = -I. -I$(top_srcdir) @CPPFLAGS@
@@ -39,7 +40,7 @@ COMPILE2 = $(CC) -c $(DEFS) $(CONFIGDEFS) $(INCLUDES) $(CFLAGS)
 
 
 .SUFFIXES:
-.SUFFIXES: .c .o
+.SUFFIXES: .c .o .lex
 
 .c.o:
 	$(COMPILE) $<
@@ -97,8 +98,9 @@ lint: sigmsg.h
 # some lexes will only accept '-n -t', not '-nt'.
 # Also, not all makes accept $< in non-pattern rules,
 # hence the explicit filenames here.
-dtimep.c: dtimep.lex
+dtimep.o: dtimep.lex
 	$(LEX) -n -t $(srcdir)/dtimep.lex > dtimep.c
+	$(COMPILE) $(DISABLE_UNUSED_MACROS_WARNING) dtimep.c
 
 client.o: client.c
 	$(COMPILE2) $(srcdir)/client.c
-- 
1.7.10.4