From e56767b9caa02e7c41803499c77dc939d5a7f64a Mon Sep 17 00:00:00 2001
From: Thorsten Glaser <tg@mirbsd.org>
Date: Fri, 20 Jun 2014 10:56:27 +0000
Subject: [PATCH 4/6] Restore compatibility to dietlibc, klibc, musl libc after commit 4f1b108

Each C library has their own way to define off_t, and the <features.h>
header is nonstandard and specific to the GNU libc and those that clone
it (uClibc). Fefe’s dietlibc uses different flags, and klibc always uses
a 64-bit off_t (like the BSDs); musl libc cannot be recognised using cpp
instructions, so we assume 64 bit there (and on unknown C libraries) and
leave it to the user to submit a follow-up fix if we guess wrong. I also
added a static assertion to verify the 64 bit guess is correct.

It would be really better using a configure script for this instead.

Fixes:
|   CC      lib/libmtd.o
| In file included from ubi-utils/ubiutils-common.c:35:0:
| ./include/common.h:29:22: fatal error: features.h: No such file or directory
|  #include <features.h>
|                       ^
| compilation terminated.

Upstream-Status: Pending

Signed-off-by: Thorsten Glaser <tg@mirbsd.org>
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
---
 include/common.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/common.h b/include/common.h
index 6895e5c..77f3f7d 100644
--- a/include/common.h
+++ b/include/common.h
@@ -26,7 +26,9 @@
 #include <string.h>
 #include <fcntl.h>
 #include <errno.h>
+#if defined(__GLIBC__) || defined(__UCLIBC__)
 #include <features.h>
+#endif
 #include <inttypes.h>
 #include "version.h"
 
@@ -52,6 +54,21 @@ extern "C" {
 #endif
 
 /* define a print format specifier for off_t */
+#if defined(__KLIBC__)
+/* always 64 bit on klibc */
+#define PRIxoff_t PRIx64
+#define PRIdoff_t PRId64
+#elif defined(__dietlibc__)
+/* depends on compiler flags on dietlibc */
+#if defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
+#define PRIxoff_t PRIx64
+#define PRIdoff_t PRId64
+#else
+#define PRIxoff_t "l"PRIx32
+#define PRIdoff_t "l"PRId32
+#endif
+#elif defined(__GLIBC__) || defined(__UCLIBC__)
+/* depends on compiler flags on glibc and uClibc */
 #ifdef __USE_FILE_OFFSET64
 #define PRIxoff_t PRIx64
 #define PRIdoff_t PRId64
@@ -59,6 +76,13 @@ extern "C" {
 #define PRIxoff_t "l"PRIx32
 #define PRIdoff_t "l"PRId32
 #endif
+#else
+/* unknown libc or musl */
+#define PRIxoff_t PRIx64
+#define PRIdoff_t PRId64
+/* verify our guess of 64 bit is correct */
+static char __PRIxoff_t_static_assert[sizeof(off_t) == 8 ? 1 : -1];
+#endif
 
 /* Verbose messages */
 #define bareverbose(verbose, fmt, ...) do {                        \
-- 
1.9.1