[OE-core] [PATCH v3] gcc-sanitizers: fix -Werror=maybe-uninitialized issue

[Yu, Mingli]

On 2019年04月09日 11:53, Khem Raj wrote:
> On Mon, Apr 8, 2019 at 7:32 PM <mingli.yu at windriver.com> wrote:
>>
>> From: Mingli Yu <Mingli.Yu at windriver.com>
>>
>> When DEBUG_BUILD = "1" added in local.conf, there
>> comes below build error when "bitbake gcc-sanitizers":
>> | ./../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c: In function 'elf_is_symlink':
>> | ../../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c:772:21: error: 'st.st_mode' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>> |   return S_ISLNK (st.st_mode);
>>
>> Per https://gcc.gnu.org/ml/gcc-patches/2019-04/msg00315.html,
>> the gcc upstream thinks the warning is a false
>> positive and suggests to use -O2 rather than -Og
>> or -O1 when compiling that file, so pass -Wno-error
>> to compiler when -Og is used to silence the error.
>>
>
> Not particular to this change but in general if a package says that it
> does not support -Og
> then we are just going to get into more and more untested grounds
> especially during runtime
> so I wonder how useful it will be to use -Og for such packages or any
> other non supported
> combination for that matter.

Hi Khem,

Any other suggestion to silence the gcc-sanitizers build error when 
DEBUG_BUILD is enabled?

Or just keep the logic DEBUG_OPTIMIZATION_append = " -Wno-error" as my 
patch stated?

Thanks,

>
>> Signed-off-by: Mingli Yu <Mingli.Yu at windriver.com>
>> ---
>>   meta/recipes-devtools/gcc/gcc-sanitizers.inc | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/meta/recipes-devtools/gcc/gcc-sanitizers.inc b/meta/recipes-devtools/gcc/gcc-sanitizers.inc
>> index e5e8452..8b1d1c9 100644
>> --- a/meta/recipes-devtools/gcc/gcc-sanitizers.inc
>> +++ b/meta/recipes-devtools/gcc/gcc-sanitizers.inc
>> @@ -45,6 +45,9 @@ INHIBIT_DEFAULT_DEPS = "1"
>>   ALLOW_EMPTY_${PN} = "1"
>>   DEPENDS = "gcc-runtime virtual/${TARGET_PREFIX}gcc"
>>
>> +# used to fix ../../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c:772:21: error: 'st.st_mode' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>> +DEBUG_OPTIMIZATION_append = " -Wno-error"
>> +
>>   BBCLASSEXTEND = "nativesdk"
>>
>>   PACKAGES = "${PN} ${PN}-dbg"
>> --
>> 2.7.4
>>
>