Commit Graph

5 Commits

Author SHA1 Message Date
Eric Fiselier 6912539717 Remove debug output from gen_linker_script.py
llvm-svn: 283701
2016-10-09 21:43:30 +00:00
Eric Fiselier 054fc4cef6 Fix linker script generation for in-tree builds
llvm-svn: 283700
2016-10-09 21:34:03 +00:00
Michal Gorny 2433b26176 [cmake] Split linked libraries into private & public, for linker script
Introduce LIBCXX_LIBRARIES_PUBLIC in addition to LIBCXX_LIBRARIES that
holds 'public' interface libraries -- that is, libraries that both
libc++ links to and programs linked against it need to link to.

Currently this includes the ABI library and optionally -lunwind (when
LIBCXXABI_USE_LLVM_UNWINDER is on). The libraries are included in the
linker script, in order to make it possible to link C++ programs using
clang with compiler-rt runtime out-of-the-box.

Differential Revision: https://reviews.llvm.org/D25008

llvm-svn: 283659
2016-10-08 10:27:45 +00:00
Eric Fiselier eb2ff93b14 Add more missing license headers
llvm-svn: 258198
2016-01-19 21:58:49 +00:00
Eric Fiselier 8241405ad4 [libcxx] Make it drastically simpler to link libc++.
Summary:
Currently on most platforms you have to manually link the c++ abi library used with libc++ whenever you use libc++. So your typical libc++ command like invocation might look like:

```
clang++ -stdlib=libc++ foo.cpp -lc++abi
```

Having to manually link `libc++abi.so` makes it harder for libc++ to be used generically. This patch fixes that by generating a linker script for `libc++.so` that correctly links the ABI library. On linux the linker script for libc++abi would look like:

```
# libc++.so
INPUT(libc++.so.1 -lc++abi)
```

With the linker script you can now use libc++ using only `-stdlib=libc++`. This is the technique that is used on FreeBSD in ordered to link cxxrt and I think it's the best approach to make our users lives simpler.

The CMake option used to enable this is `LIBCXX_ENABLE_ABI_LINKER_SCRIPT`. In future I would like to enable this by default on all platforms except for Darwin.

Reviewers: mclow.lists, danalbert, rsmith, jroelofs, EricWF

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D12508

llvm-svn: 250319
2015-10-14 19:54:03 +00:00