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