FYI, I've just pushed this:
From 3e32a76f469635ccbbecd8f053e2b2053e2455c0 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyer...@fb.com>
Date: Mon, 24 Aug 2015 09:10:51 -0700
Subject: [PATCH] build: avoid -Wshift-negative-value warning
Configured with --enable-gcc-warnings, a gcc-6.x build would fail with this:
gzip.c:118:32: error: left shift of negative value
#define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
* gzip.c [OFF_T_MAX]: Define in terms of TYPE_MAXIMUM, not OFF_T_MIN.
[OFF_T_MIN]: Remove now-unused definition.
Include "intprops.h" for definiton of TYPE_MAXIMUM.
* bootstrap.conf (gnulib_modules): Add intprops.
---
bootstrap.conf | 1 +
gzip.c | 7 ++-----
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/bootstrap.conf b/bootstrap.conf
index deb548f..1387106 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -39,6 +39,7 @@ gnu-web-doc-update
gnumakefile
gnupload
ignore-value
+intprops
largefile
lib-ignore
lstat
diff --git a/gzip.c b/gzip.c
index 8c40928..40fee35 100644
--- a/gzip.c
+++ b/gzip.c
@@ -65,6 +65,7 @@ static char const *const license_msg[] = {
#include "closein.h"
#include "tailor.h"
#include "gzip.h"
+#include "intprops.h"
#include "lzw.h"
#include "revision.h"
#include "timespec.h"
@@ -114,12 +115,8 @@ static char const *const license_msg[] = {
off_t lseek (int fd, off_t offset, int whence);
#endif
-#ifndef OFF_T_MIN
-#define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
-#endif
-
#ifndef OFF_T_MAX
-#define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN)
+# define OFF_T_MAX TYPE_MAXIMUM (off_t)
#endif
/* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is
--
2.3.7
