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

[Leslie Zhai via llvm-dev]

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