Re: [PATCH V2] ltp: set -fomit-frame-pointer explicitly for x86-64

["Yu, Mingli" <mingli.yu@windriver.com>]

On 2018年06月15日 17:16, Richard Purdie wrote:
> On Fri, 2018-06-15 at 17:01 +0800, mingli.yu@windriver.com wrote:
>> From: Mingli Yu <Mingli.Yu@windriver.com>
>>
>> When build ltp with -fno-omit-frame-pointer on
>> x86-64, it will trigger below error:
>>> cve-2015-3290.c: In function 'child_thread':
>>> cve-2015-3290.c:416:1: error: bp cannot be used in asm here
>>
>> And there is also some comment as below in the source
>> file ltp/20180515-r0/git/testcases/cve/cve-2015-3290.c
>> * Build with -O2.  Don't use -fno-omit-frame-pointer.
>>
>> So explicitly set -fomit-frame-pointer on x86-64 for
>> compiler to fix the above build error.
>>
>> Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
>> ---
>>   meta/recipes-extended/ltp/ltp_20180515.bb | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/meta/recipes-extended/ltp/ltp_20180515.bb
>> b/meta/recipes-extended/ltp/ltp_20180515.bb
>> index b07c1b9..7fd8565 100644
>> --- a/meta/recipes-extended/ltp/ltp_20180515.bb
>> +++ b/meta/recipes-extended/ltp/ltp_20180515.bb
>> @@ -19,6 +19,11 @@ LIC_FILES_CHKSUM = "\
>>   DEPENDS = "attr libaio libcap acl openssl zip-native"
>>   DEPENDS_append_libc-musl = " fts "
>>   EXTRA_OEMAKE_append_libc-musl = " LIBC=musl "
>> +
>> +# set -fomit-frame-pointer to handle cases where optimisation is set
>> to -O0 or frame
>> +# pointers have been enabled by -fno-omit-frame-pointer earlier in
>> CFLAGS, etc.
>> +CFLAGS_append_x86-64 = " -fomit-frame-pointer"
>> +
>>   CFLAGS_append_powerpc64 = " -D__SANE_USERSPACE_TYPES__"
>>   CFLAGS_append_mipsarchn64 = " -D__SANE_USERSPACE_TYPES__"
>>   SRCREV = "96cbf48313afa65ef4d693d3441cbfd60a8d9b27"
>
> Can you extend the comment to include:
>
> "since ltp contains x86-64 assembler which uses the frame-pointer
> register"
>
> so that the comment doesn't just say what you're doing but why its
> necessary only for x86-64

Thanks Richard!

It makes sense, will send out V3 to explain more why it's only necessary 
only for x86-64.

Thanks,

>
> Cheers,
>
> Richard
>
>
>