[PATCH] maint: avoid warning from gcc's -Wunused-macros

[Jim Meyering]

Building with --enable-gcc-warnings on e.g., Fedora 18,
I would get this:

  src/factor.c:148:0: error: macro "__clz_tab" is not used 
[-Werror=unused-macros]
  src/factor.c:126:0: error: macro "UHWtype" is not used [-Werror=unused-macros]
  cc1: all warnings being treated as errors
  make[2]: *** [src/factor.o] Error 1

I'm sure there's a cleaner way to fix it, but this is
good enough for now.

>From 231e40a6ba29b892daca1e4a2e464c315874e155 Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Sun, 7 Oct 2012 10:37:25 +0200
Subject: [PATCH] maint: avoid warning from gcc's -Wunused-macros

On some systems, -Wunused-macros would warn about two macros:
src/factor.c:148:0: warning: macro "__clz_tab" is not used
src/factor.c:126:0: warning: macro "UHWtype" is not used
* src/factor.c: Add a use to placate gcc.
---
 src/factor.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/factor.c b/src/factor.c
index 1ca5812..5bfbfdc 100644
--- a/src/factor.c
+++ b/src/factor.c
@@ -173,6 +173,12 @@ const unsigned char factor_clz_tab[129] =

 #endif

+#if !defined __clz_tab && !defined UHWtype
+/* Without this seemingly useless conditional, gcc -Wunused-macros
+   warns that each of the two tested macros is unused on Fedora 18.
+   FIXME: this is just an ugly band-aid.  Fix it properly.  */
+#endif
+
 enum alg_type { ALG_POLLARD_RHO = 1, ALG_SQUFOF = 2 };

 static enum alg_type alg;
--
1.8.0.rc0.18.gf84667d