(original) (raw)

Thanks a lot, but tried it and I get this:

CMake Error at projects/libcxx/CMakeLists.txt:361 (message):

LIBCXX\_ENABLE\_STATIC\_ABI\_LIBRARY is not supported on OS X

Why is it not supported? If I manually embed libc++abi.a inside
libc++.a it seems to work.

Thanks!

ardi

On Mon, Oct 1, 2018 at 4:20 AM Petr Hosek <phosek@chromium.org> wrote:
\>
\> You can use LIBCXX\_ENABLE\_STATIC\_ABI\_LIBRARY=ON CMake option to statically link libc++abi into libc++.a. You can also use LIBCXX\_STATICALLY\_LINK\_ABI\_IN\_SHARED\_LIBRARY=OFF to disable statically linking libc++abi into libc++.so (i.e. libc++abi will only be merged into libc++.a, not libc++.so).
\>
\> Similarly, you can also use LIBCXXABI\_ENABLE\_STATIC\_UNWINDER=ON and LIBCXXABI\_STATICALLY\_LINK\_UNWINDER\_IN\_SHARED\_LIBRARY=OFF to the same for libunwind.
\>
\> Alternatively, you could rename libc++.a to libc++\_internal.a and then create a linker script named libc++.a with the following content:
\>
\> INPUT(libc++\_internal.a libc++abi.a)
\>
\> There's no support to do so in CMake at the moment, but it's something we've already discussed within Fuchsia as it'd be also useful for sanitizer runtimes so I might start a (separate) discussion about adding such support.
\>
\> On Sun, Sep 30, 2018 at 2:40 PM ardi via llvm-dev <llvm-dev@lists.llvm.org> wrote:
\>>
\>> Hi!
\>>
\>> I sometimes build LLVM with a static libc++.a in MacOS, so that I use
\>> the LLVM libc++ instead of the system-wide one. However, when doing
\>> so, I always get link errors when building LLVM, because the build
\>> system links with libc++.a, but not with libc++abi.a and so there are
\>> quite a few missing symbols that the linker cannot find.
\>>
\>> My workaround (which always seems to work) is to embed libc++abi
\>> inside of libc++ (with libtool, for example), but that's a hack for
\>> being in a hurry. BTW, note that I'm talking about building LLVM
\>> itself, not my programs (when you build your programs it doesn't hurt
\>> to add -lc++abi to your link line, but when building LLVM, how are
\>> you supposed to do it? I've searched for a cleaner solution to this,
\>> but couldn't find any.
\>>
\>> Isn't there any LLVM build option for simply telling "hey! don't
\>> forget to add -lc++abi whenever you link to libc++" ?
\>>
\>> Thanks!
\>>
\>> ardi
\>> \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
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