From d0d308f54baaa977292b6ea586a9577aa6e2a8e4 Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Sun, 6 Oct 2013 22:13:19 +0000
Subject: Make it possible to link against libstdc++ as well as libsupc++ with
 CMake.

Linking against libstdc++, rather than libsupc++, is probably better
for people who need to link against clients of libstdc++.  Because
libsupc++ is provided only as a static library, its globals are not
shared between the static library and the copy linked into libstdc++.
This has been found to cause at least one test failure.

This also removes a number of symbols which were multiply defined
between libstdc++ and libc++, only when linking with libstdc++.

Differential Revision: http://llvm-reviews.chandlerc.com/D1825

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192075 91177308-0d34-0410-b5e6-96231b3b80d8
---
 www/index.html | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'www')

diff --git a/www/index.html b/www/index.html
index 71d30b8e3..02470ea9a 100644
--- a/www/index.html
+++ b/www/index.html
@@ -248,11 +248,18 @@ End of search list.
      We can now run CMake:
      <ul>
        <li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
-                -DLIBCXX_CXX_ABI=libsupc++
+                -DLIBCXX_CXX_ABI=libstdc++
                 -DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="/usr/include/c++/4.7/;/usr/include/c++/4.7/x86_64-linux-gnu/"
                 -DCMAKE_BUILD_TYPE=Release
                 -DCMAKE_INSTALL_PREFIX=/usr
                 &lt;libc++-source-dir&gt;</code></li>
+       <li>You can also substitute <code>-DLIBCXX_CXX_ABI=libsupc++</code>
+       above, which will cause the library to be linked to libsupc++ instead
+       of libstdc++, but this is only recommended if you know that you will
+       never need to link against libstdc++ in the same executable as libc++.
+       GCC ships libsupc++ separately but only as a static library.  If a
+       program also needs to link against libstdc++, it will provide its
+       own copy of libsupc++ and this can lead to subtle problems.
        <li><code>make</code></li>
        <li><code>sudo make install</code></li>
      </ul>
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