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blktrace: re-enable on uClibc

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With a small patch, blktrace can work on uClibc: we simply need to link
with librt to use the posix_spawn*() functions.

[Thomas: add reference to upstream commit.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2016-08-23 16:40:00 +02:00
parent 9c67af2c52
commit 8972c398ff
2 changed files with 31 additions and 5 deletions
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31
package/blktrace/0001-iowatcher-link-with-lrt.patch Normal file
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@ -0,0 +1,31 @@
From 80d87b99d72034441ea4fbab81f5c80c1ef3b067 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Tue, 23 Aug 2016 16:36:14 +0200
Subject: [PATCH] iowatcher: link with -lrt
Some C libraries (notably uClibc) have the posix_spawn*() functions in
librt, so let's link iowatcher with -lrt.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Upstream-status: merged
(http://git.kernel.org/cgit/linux/kernel/git/axboe/blktrace.git/commit/?id=d1ab783430f5a832e973ed9a293da146c04c6702)
---
iowatcher/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/iowatcher/Makefile b/iowatcher/Makefile
index 7b5101c..502476d 100644
--- a/iowatcher/Makefile
+++ b/iowatcher/Makefile
@@ -19,7 +19,7 @@ all: $(ALL)
$(CC) -o $*.o -c $(ALL_CFLAGS) $<
iowatcher: blkparse.o plot.o main.o tracers.o mpstat.o fio.o
- $(CC) $(ALL_CFLAGS) -o $@ $(filter %.o,$^) -lm
+ $(CC) $(ALL_CFLAGS) -o $@ $(filter %.o,$^) -lm -lrt
depend:
@$(CC) -MM $(ALL_CFLAGS) *.c 1> .depend
--
2.7.4

5
package/blktrace/Config.in
View File

@ -1,7 +1,5 @@
config BR2_PACKAGE_BLKTRACE
bool "blktrace"
# Uses posix_spawn()
depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL
depends on BR2_PACKAGE_LIBAIO_ARCH_SUPPORTS
select BR2_PACKAGE_LIBAIO
help
@ -10,6 +8,3 @@ config BR2_PACKAGE_BLKTRACE
up to user space.
http://git.kernel.dk/?p=blktrace.git;a=summary
comment "blktrace needs a glibc or musl toolchain"
depends on !(BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL)