[Bug 1332306] Review Request: libcxxabi - Low level support for a standard C++ library

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https://bugzilla.redhat.com/show_bug.cgi?id=1332306



--- Comment #18 from Daniel Seither <tiwoc@xxxxxxxx> ---
I get a symlink for libc++abi.so on Fedora 25 (x86_64):

lrwxrwxrwx. 1 root root   14  1. Mär 19:19 /usr/lib64/libc++abi.so ->
libc++abi.so.1
lrwxrwxrwx. 1 root root   16  1. Mär 19:19 /usr/lib64/libc++abi.so.1 ->
libc++abi.so.1.0
-rwxr-xr-x. 1 root root 270K  1. Mär 19:19 /usr/lib64/libc++abi.so.1.0

However, when using the Fedora-provided clang-3.8.1-1 and installing
libcxx-3.8.1-2 and libcxxabi-3.8.1-2 from updates-testing, I need to manually
add -lc++abi to my build command (just like schlaffi did). When using a binary
build of clang from llvm.org, this is not necessary [0].

In the libcxx docs [1], it is explained that "some libc++ installations require
the user manually link libc++abi themselves". Could this requirement be removed
from the Fedora builds?

[0] At least as long as the libcxx and libcxxabi Fedora packages are not
installed. Somehow clang uses the system-provided libs instead of its own.

[1] http://libcxx.llvm.org/docs/UsingLibcxx.html#using-libc-on-linux

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