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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - argument unused during compilation: '-stdlib=libc++'"
href="http://llvm.org/bugs/show_bug.cgi?id=20395">20395</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>argument unused during compilation: '-stdlib=libc++'
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++abi
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>oroppas@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>libcxxabi/src/*.cpp are compiled with '-nostdinc++' and building with
LLVM_ENABLE_LIBCXX:BOOL=ON issues the warning like
[48/1203] Building CXX object
projects/libcxxabi/src/CMakeFiles/cxxabi.dir/cxa_demangle.cpp.o
clang-3.5: warning: argument unused during compilation: '-stdlib=libc++'
for all *.cpp in libcxxabi.
Simply removing '-stdlib=libc++' for compilation of libcxxabi/src/*.cpp should
fix the problem.
Index: llvm/projects/libcxxabi/CMakeLists.txt
===================================================================
--- llvm/projects/libcxxabi/CMakeLists.txt (revision 213616)
+++ llvm/projects/libcxxabi/CMakeLists.txt (working copy)
@@ -124,7 +124,7 @@
${LLVM_INCLUDE_DIR}/c++/v1
)
-set(LIBCXXABI_LIBCXX_INCLUDES "${LIBCXXABI_LIBCXX_INCLUDES}" CACHE STRING
+set(LIBCXXABI_LIBCXX_INCLUDES "${LIBCXXABI_LIBCXX_INCLUDES}" CACHE PATH
"Specify path to libc++ includes." FORCE)
#===============================================================================
@@ -154,6 +154,7 @@
if (LIBCXXABI_HAS_NOSTDINCXX_FLAG)
list(APPEND LIBCXXABI_CXX_REQUIRED_FLAGS -nostdinc++)
+ string(REPLACE "-stdlib=libc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
append_if(LIBCXXABI_CXX_REQUIRED_FLAGS LIBCXXABI_HAS_WERROR_FLAG
-Werror=return-type)</pre>
</div>
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