http://llvm.org/bugs/show_bug.cgi?id=20395
Bug ID: 20395
Summary: argument unused during compilation: '-stdlib=libc++'
Product: libc++abi
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
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)
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