[cfe-dev] libc++abi on linux
benpope81 at gmail.com
Sun Jul 8 20:00:48 PDT 2012
On Monday, July 09, 2012 08:49 AM, "C. Bergström" wrote:
> libcxxrt + libunwind is the way to go imho
> These have been tested to work with clang - Admittedly the build process
> may not be straight forward, but if enough interest maybe we solve that
It would be nice to have a documented/tested/working way of compiling
*and linking* programs using libc++/clang/llvm on linux, it seems that
libc++abi is pretty close to getting that working.
This comes up on the list every couple of months and libcxxrt/libunwind
are usually suggested over libc++abi.
What is the problem? Is there some disagreement about the scope of
libc++abi? Is there some specific part that has been excluded that is
required on linux but not darwin? Does libc++abi replace libsupcxx (not
entirely)? Does libunwind address just the missing bit or is there
overlap? If there is overlap is linking order enough to fix that? is
libc++abi equivalent to libcxxrt? And there are lots of other questions
that come up and it just makes it hard to get going.
I think it's a real shame that this is not documented for linux, I
suspect it is preventing the uptake of libc++ with clang on linux and
that's a real shame, especially as libc++ has become the default in the
There are other problems as well; sometimes it's really a pain to get
configure to work properly when trying to choose between which abi bits
we want, it would be nice if we could do:
clang++ -std=c++11 -stdlib=libc++ -stdlibabi=libc++abi -stdlibunwind?=???
Really that line starts to get a bit scary, if I'm using clang in c++11
mode, there should be a default that works, I strongly suggest that the
default library is libc++ (because stdlibc++ practically always requires
a patch to work with clang), and that the missing bits (abi/unwind) can
be made to Just Work(tm).
Can the defaults be configured when you configure clang or through some
other global means so that I don't have to teach every build system what
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