package/btrfs-progs/0002-kerncompat.h-define-BTRFS_DISABLE_BACKTRACE-when-bui.patch

   1 From 1fc5444f5620670bb9d293be4f92df59661e1810 Mon Sep 17 00:00:00 2001
   2 From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   3 Date: Mon, 20 Feb 2017 23:31:24 +0100
   4 Subject: [PATCH] kerncompat.h: define BTRFS_DISABLE_BACKTRACE when building
   5  with uClibc
   6
   7 uClibc does not provide backtrace() nor <execinfo.h>. When building
   8 btrfs-progs, passing --disable-backtrace is enough to make it build with
   9 uClibc. But once btrfs-progs is installed and another program/library
  10 includes kerncompat.h, it fails to build with uClibc, because
  11 BTRFS_DISABLE_BACKTRACE is not defined.
  12
  13 The most correct fix for this would be to have kerncompat.h generated
  14 from kerncompat.h.in during the btrfs-progs build process, and tuned
  15 depending on autoconf/automake variables. But as a quick fix that
  16 follows the current strategy, we simply tweak the existing __GLIBC__
  17 conditional. Indeed, uClibc pretends to be glibc and defines __GLIBC__,
  18 but it does not replace it completely, hence the need to define
  19 BTRFS_DISABLE_BACKTRACE when __GLIBC__ is not defined *or* when
  20 __UCLIBC__ is defined.
  21
  22 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  23 ---
  24  kerncompat.h | 2 +-
  25  1 file changed, 1 insertion(+), 1 deletion(-)
  26
  27 diff --git a/kerncompat.h b/kerncompat.h
  28 index 0f207b7..e47d164 100644
  29 --- a/kerncompat.h
  30 +++ b/kerncompat.h
  31 @@ -32,7 +32,7 @@
  32
  33  #include <features.h>
  34
  35 -#ifndef __GLIBC__
  36 +#if !defined(__GLIBC__) || defined(__UCLIBC__)
  37  #ifndef BTRFS_DISABLE_BACKTRACE
  38  #define BTRFS_DISABLE_BACKTRACE
  39  #endif
  40 --
  41 2.7.4
  42