[llvm-dev] [RFR] JDK-8156980: Hotspot build doesn't have -std=gnu++98 gcc option

[Martin Buchholz via llvm-dev]

It would be awesome to use the sanitizers to find native code bugs in
openjdk, but it seems like a serious project.  Here at Google we are doing
our small part by improving support for clang on Linux.

On Wed, Sep 5, 2018 at 6:17 PM, Leslie Zhai <zhaixiang at loongson.cn> wrote:

> It might be UBSan false positive :) What about ASan?
> https://bugs.openjdk.java.net/browse/JDK-8189800
>
>
> 在 2018年09月06日 09:12, Martin Buchholz 写道:
>
>> it's difficult to use llvm tools like sanitizers on openjdk sources,
>> because of the "cheating" - relying on undefined behavior, and the JIT.
>>
>> On Wed, Sep 5, 2018 at 6:09 PM, Leslie Zhai <zhaixiang at loongson.cn
>> <mailto:zhaixiang at loongson.cn>> wrote:
>>
>>     Hi Martin,
>>
>>     Thanks for your response!
>>
>>     I haven't tested compiling OpenJDK 12-dev with LLVM toolchain,
>>     perhaps the issue had been fixed already, because clang treat
>>     invalid argument '-std=gnu++98' not allowed with 'C' as error.  It
>>     is better only apply EXTRA_CFLAGS to C without EXTRA_CXXFLAGS.
>>
>>     Furthermore, I just have interest, did you use clang analyzer,
>>     sanitizer and libfuzzer towards hotspot and jdk native library?
>>     Thanks!
>>
>>
>>     在 2018年09月06日 02:10, Martin Buchholz 写道:
>>
>>         We seem to have some confusion about flags for C vs. flags for
>>         C++.  Most flags for most toolchains apply to both C and C++,
>>         so it's understandable that we want to unify them.  But some
>>         flags, notably -std, are language-specific.  We have both
>>         EXTRA_CFLAGS and EXTRA_CXXFLAGS, so we should expect
>>         EXTRA_CFLAGS to only apply to C.
>>
>>
>>     --     Regards,
>>     Leslie Zhai
>>
>>
>>
>>
> --
> Regards,
> Leslie Zhai
>
>
>
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