[PATCH] build: avoid spurious test.c warning with -Wsuggest-attribute=pure

[Jim Meyering]

Without this, building on rawhide has been failing for some time
when configured with --enable-gcc-warnings.  The warning/error is
unwarranted, since the function may exit.

>From 9be9d120f01fa65be33ab98d0c728a7e849c5d4b Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Fri, 30 Dec 2011 22:48:38 +0100
Subject: [PATCH] build: avoid spurious test.c warning with
 -Wsuggest-attribute=pure

* src/test.c: Add pragma to suppress gcc-4.6.2's warning that
"advance" might be candidate for attribute 'pure'.
---
 src/test.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/test.c b/src/test.c
index a5df7c8..00f97fb 100644
--- a/src/test.c
+++ b/src/test.c
@@ -20,6 +20,12 @@
 /* Define TEST_STANDALONE to get the /bin/test version.  Otherwise, you get
    the shell builtin version. */

+/* Without this pragma, gcc 4.6.2 20111027 mistakenly suggests that
+   the advance function might be candidate for attribute 'pure'.  */
+#if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__
+# pragma GCC diagnostic ignored "-Wsuggest-attribute=pure"
+#endif
+
 #include <config.h>
 #include <stdio.h>
 #include <sys/types.h>
--
1.7.8.1.391.g2c2ad