Re: [LEDE-DEV] [PATCH 2/2] strace: add option for enabling stack trace support

[Yousong Zhou]

On 10 June 2016 at 21:43, Yousong Zhou  wrote:
> On 10 June 2016 at 20:52, Sergey Zakharchenko  
> wrote:
>> Hello Yousong,
>>
>> The libunwind-enabled strace builds fine but I'm getting a "Can't
>> initiate libunwind: Invalid argument" error when trying to use it
>> (this is on an Atheros, i.e. MIPS chip). This is just a report, I'm
>> not urging you to anything...
>>
>
> Yeah, the stack trace dump feature seems really fragile.  I noticed
> that once on qemu/malta, then did "make clean" and rebuilt, the
> 'invalid argument' error disappeared later and along with it the -k
> option does not have said effect at all.  But it works partly on
> qemu/x86_64 though at the moment the traces cannot go past libc.
>
> yousong

I tried yesterday building a x86_64 firmware with glibc and strace -k
works quite well there.  However the situation of the glibc-mips
combination is the same as with musl-mips.

My current guess is that libunwind may need some patching to work with
musl-libc.

Regards,
yousong

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[LEDE-DEV] [PATCH 2/2] strace: add option for enabling stack trace support

[Yousong Zhou]

Signed-off-by: Yousong Zhou 
---
 package/devel/strace/Makefile | 11 ++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/package/devel/strace/Makefile b/package/devel/strace/Makefile
index 8a0d2e8..df560fd 100644
--- a/package/devel/strace/Makefile
+++ b/package/devel/strace/Makefile
@@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=strace
 
 PKG_VERSION:=4.11
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_MD5SUM:=a15d2555a7febb56d00c6e1a51c655dc
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
@@ -23,6 +23,7 @@ PKG_LICENSE_FILES:=COPYRIGHT
 PKG_MAINTAINER:=Felix Fietkau 
 
 PKG_FIXUP:=autoreconf
+PKG_CONFIG_DEPENDS:=CONFIG_PACKAGE_strace_libunwind
 PKG_INSTALL:=1
 
 include $(INCLUDE_DIR)/package.mk
@@ -39,6 +40,7 @@ define Package/strace
   SECTION:=utils
   CATEGORY:=Utilities
   TITLE:=System call tracer
+  DEPENDS:=+PACKAGE_strace_libunwind:libunwind
   URL:=http://strace.sourceforge.net/
 endef
 
@@ -47,6 +49,13 @@ A useful diagnostic, instructional, and debugging tool. 
Allows you to track what
 system calls a program makes while it is running.
 endef
 
+define Package/strace/config
+config PACKAGE_strace_libunwind
+   bool "Enable stack tracing support using libunwind (experimental)"
+   default n
+endef
+
+CONFIGURE_ARGS += --with-libunwind=$(if 
$(CONFIG_PACKAGE_strace_libunwind),yes,no)
 MAKE_FLAGS := \
CCOPT="$(TARGET_CFLAGS)"
 
-- 
2.6.4


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