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Re: [Qemu-devel] [RFC PATCH 2/4] configure: introduce --extra-libs
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [RFC PATCH 2/4] configure: introduce --extra-libs |
Date: |
Tue, 26 Jan 2016 08:43:59 +0000 |
User-agent: |
mu4e 0.9.17; emacs 25.0.50.6 |
Paolo Bonzini <address@hidden> writes:
> On 25/01/2016 19:15, Alex Bennée wrote:
>>
>> Paolo Bonzini <address@hidden> writes:
>>
>>> On 25/01/2016 17:49, Alex Bennée wrote:
>>>> If for example you want to use the thread sanitizer you want to ensure all
>>>> binaries are linked with the library:
>>>>
>>>> ./configure ${TARGETS} --cc=gcc-5 --cxx=g++-5 \
>>>> --extra-cflags="-fsanitize=thread" --extra-libs="-ltsan"
>>>
>>> Shouldn't -fsanitize=thread work as a linker command line flag too?
>>
>> No, the sanitizers are compile time options as they instrument the
>> generated code. It's just in the case of the ThreadSanitizer you also
>> need the support library.
>
> That's certainly not the case. My system has at least a libubsan,
> libasan and liblsan (in addition to libtsan), and "gcc -dumpspecs"
> suggests that the -fsanitize options are also valid at link time:
>
> %{%:sanitize(address):%{!shared:libasan_preinit%O%s}
> %{static-libasan:%{!shared:-Bstatic --whole-archive -lasan --no-whole-archive
> -Bdynamic}}%{!static-libasan:-lasan}}
> %{%:sanitize(thread):%{static-libtsan:%{!shared:-Bstatic --whole-archive
> -ltsan --no-whole-archive -Bdynamic}}%{!static-libtsan:-ltsan}}
> %{%:sanitize(leak):%{static-liblsan:%{!shared:-Bstatic --whole-archive
> -llsan --no-whole-archive -Bdynamic}}%{!static-liblsan:-llsan}}
>
> (GCC specs are what they are, but you get the idea).
Hmm odd. I ran the undefined and address sanitizers without having to
mess with the ldflags. I'll have a deeper dive into the docs to see
whats going on.
>
> Paolo
--
Alex Bennée
- [Qemu-devel] [RFC PATCH 1/4] configure: move EXTRA_CFLAGS append to the end, (continued)
[Qemu-devel] [RFC PATCH 3/4] include/qemu/atomic.h: default to __atomic functions, Alex Bennée, 2016/01/25
[Qemu-devel] [RFC PATCH 4/4] tsan: various fixes for make check, Alex Bennée, 2016/01/25