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From: "Qiu, Michael" <michael.qiu@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 3/3 v2] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’
Date: Thu, 5 Mar 2015 16:31:25 +0000
Message-ID: <533710CFB86FA344BFBF2D6802E60286CEF29E@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <2382780.BfG7EQavsa@xps13>

On 2015/3/5 22:39, Thomas Monjalon wrote:
> 2015-03-05 14:03, Qiu, Michael:
>> On 3/5/2015 9:54 PM, David Marchand wrote:
>>> On Thu, Mar 5, 2015 at 2:50 PM, Michael Qiu <michael.qiu@intel.com
>>> <mailto:michael.qiu@intel.com>> wrote:
>>>
>>>     include/rte_cpuflags.h:154:2: error: redeclaration of enumerator
>>>     ‘REG_EAX’
>>>     In file included from /usr/include/signal.h:358:0,
>>>                      from /usr/include/sys/wait.h:30,
>>>                      from /root/dpdk/app/test/test_mp_secondary.c:50:
>>>     /usr/include/sys/ucontext.h:180:3: note: previous definition of
>>>     ‘REG_EAX’ was here
>>>
>>>     In i686, from REG_EAX to REG_EDX are all defined in
>>>             /usr/include/sys/ucontext.h
>>>
>>>     Rename to CPU_REG_EAX to avoid this issue.
>>>
>>>     Signed-off-by: Michael Qou <michael.qiu@intel.com
>>>     <mailto:michael.qiu@intel.com>>
>>>
>>>
>>> NAK.
>>>
>> I have answered in you last thread, please check the mail.
>>
>> Yes, but for some reason, it was not include, see /usr/include/signal.h:358
>>
>> # include <bits/sigstack.h>
>> # if defined __USE_XOPEN || defined __USE_XOPEN2K8
>> /* This will define `ucontext_t' and `mcontext_t'.  */
>> #  include <sys/ucontext.h>
>> # endif
>>
>> So only if __USE_XOPEN or __USE_XOPEN2K8 been defined will include 
>> <sys/ucontext.h>
> So try to define USE_XOPEN.
>
>> Why NAK?
> Because it seems you didn't really try to include system headers.

See below(ucontext.h:25):
#ifdef __x86_64__
...
#ifdef __USE_GNU
enmu{
    ...
  REG_RBX,
# define REG_RBX        REG_RBX
  REG_RDX,
# define REG_RDX        REG_RDX
  REG_RAX,
# define REG_RAX        REG_RAX
  REG_RCX,
# define REG_RCX        REG_RCX
...
};
#endif
...
#else /* !__x86_64__ */
...
#ifdef __USE_GNU
enmu{
...
  REG_EBX,
# define REG_EBX        REG_EBX
  REG_EDX,
# define REG_EDX        REG_EDX
  REG_ECX,
# define REG_ECX        REG_ECX
  REG_EAX,
# define REG_EAX        REG_EAX
...
};
#endif
...
#endif /* !__x86_64__ */


For none x86_64 platform will be defined as REG_E*X, but x86_64 will be
REG_R*X.

This is why only happens in i686 platform.

Does this clear?

Thanks,
Michael
> We must avoid redefine existing symbols. That's why this bug happens.
> Michael, thanks for trying to fix this issue. It's appreciated even if
> the first solution is refused.
>
>


  reply	other threads:[~2015-03-05 16:31 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-05 13:15 [dpdk-dev] [PATCH 0/3] dpdk2.0-rc1 build error fix Michael Qiu
2015-03-05 13:15 ` [dpdk-dev] [PATCH 1/3] librte_hash: Fix unsupported instruction `crc32' in i686 platform Michael Qiu
2015-03-05 16:10   ` Yerden Zhumabekov
2015-03-05 16:34     ` Qiu, Michael
2015-03-05 16:55   ` [dpdk-dev] [PATCH 1/3 v2] " Michael Qiu
2015-03-05 17:02     ` Yerden Zhumabekov
2015-03-05 17:10     ` Thomas Monjalon
2015-03-06  1:39       ` Qiu, Michael
2015-03-07 18:39         ` Thomas Monjalon
2015-03-10  3:55           ` Yerden Zhumabekov
2015-03-19  2:00           ` Qiu, Michael
2015-03-19  8:10             ` Thomas Monjalon
2015-03-09  5:58     ` [dpdk-dev] [PATCH 1/3 v3] " Michael Qiu
2015-03-18 13:20       ` Liu, Yong
2015-03-18 14:59         ` Qiu, Michael
2015-03-05 13:15 ` [dpdk-dev] [PATCH 2/3] app/test: Fix size_t printf formart issue Michael Qiu
2015-03-05 13:22   ` Bruce Richardson
2015-03-05 14:00   ` [dpdk-dev] [PATCH 2/3 v2] app/test: Fix size_t printf format issue Michael Qiu
2015-03-05 17:27     ` Thomas Monjalon
2015-03-06  1:42       ` Qiu, Michael
2015-03-06  3:53     ` [dpdk-dev] [PATCH 2/3 v3] " Michael Qiu
2015-03-05 13:15 ` [dpdk-dev] [PATCH 3/3] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’ Michael Qiu
2015-03-05 13:23   ` Bruce Richardson
2015-03-05 13:36     ` David Marchand
2015-03-05 13:54       ` Qiu, Michael
2015-03-05 13:41     ` Qiu, Michael
2015-03-05 13:23   ` Qiu, Michael
2015-03-05 13:50   ` [dpdk-dev] [PATCH 3/3 v2] =?UTF-8?q?librte=5Feal/common:=20Fix=20redeclaration=20of?= =?UTF-8?q?=20enumerator=20=E2=80=98REG=5FEAX=E2=80=99?= Michael Qiu
2015-03-05 13:54     ` [dpdk-dev] [PATCH 3/3 v2] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’ David Marchand
2015-03-05 14:03       ` Qiu, Michael
2015-03-05 14:38         ` Thomas Monjalon
2015-03-05 16:31           ` Qiu, Michael [this message]
2015-03-05 18:24             ` Thomas Monjalon
2015-03-05 13:57   ` [dpdk-dev] [PATCH 3/3 v3] =?UTF-8?q?librte=5Feal/common:=20Fix=20redeclaration=20of?= =?UTF-8?q?=20enumerator=20=E2=80=98REG=5FEAX=E2=80=99?= Michael Qiu
2015-03-06  6:28     ` [dpdk-dev] [PATCH 3/3 v3] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’ David Marchand
2015-03-09 17:04 ` [dpdk-dev] [PATCH 0/3] dpdk2.0-rc1 build error fix Thomas Monjalon

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