我试图从源代码中使用libc ++构建Clang。而且我试图在与其他组件一起构建树外的时候删除libc ++ in-tree。我使用的食谱如下。
如果我只是将libcxx和libcxxabi置于树中，则配置 不 选择它们，并且它们不会自动构建。我将它们放在llvm/projects每LLVM's libc++ Standard Library。
此外，在配方中添加make cxx不会像在LLVM's libc++ Standard Library页面上宣传的那样有效。结果是：
llvm[0]: Constructing LLVMBuild project information.
make: *** No rule to make target `cxx'. Stop.
当我使用--with-libcxx和--with-libcxxabi
# Issued from a scratch 'build' directory, which is next to the 'llvm' directory.
../llvm/configure --enable-optimized --enable-cxx11 --with-libcxx --with-libcxxabi \
$OTHER_OPTIONS --prefix=/usr/local
然后我收到以下内容：
configure: WARNING: Unknown project (libcxx) won't be configured automatically
configure: WARNING: Unknown project (libcxxabi) won't be configured automatically
libcxx和libcxxabi实际上是LLVM所称的，所以如果它们不正确，我不确定要使用哪些名称。
我试图检查configure包名称应该是什么，但它不是很有帮助。请参阅下面的逻辑。
如何使用libc ++配置和构建Clang（当libc ++和libc ++ ABI在树中时）？
--with-XXX的配置逻辑如下所示。
这是我能找到的（它不是很有帮助）：
-with-* | --with-*)
ac_package=`expr "x$ac_option" : 'x-*with-\([^=]*\)'`
# Reject names that are not valid shell variable names.
expr "x$ac_package" : ".*[^-_$as_cr_alnum]" >/dev/null &&
{ echo "$as_me: error: invalid package name: $ac_package" >&2
{ (exit 1); exit 1; }; }
ac_package=`echo $ac_package| sed 's/-/_/g'`
eval with_$ac_package=\$ac_optarg ;;
相关链接：
此Stack Overflow问题与此相关：When is libc++ sources needed when building Clang from sources?
关于CFE-Dev邮件列表的讨论：Questions about libc++ for linux and its git repository (if any)。该线程表示将libcxx解压缩到llcm/projects可确保在make install期间将标头复制到Clang期望的位置。但它没有解决--with-XXX问题，也没有讨论为什么libc++没有构建，也没有讨论如何让make install实际安装库。
用于获取和构建Clang的配方。当 不 包括libcxx和libcxxabi时，它可以正常工作。
#! /bin/sh
# Clang 3.5 recipe.
# The script should be run from a scratch directory.
# Fetch
if [ ! -e llvm-3.5.0.src.tar.xz ]; then
wget http://llvm.org/releases/3.5.0/llvm-3.5.0.src.tar.xz
fi
if [ ! -e cfe-3.5.0.src.tar.xz ]; then
wget http://llvm.org/releases/3.5.0/cfe-3.5.0.src.tar.xz
fi
if [ ! -e compiler-rt-3.5.0.src.tar.xz ]; then
wget http://llvm.org/releases/3.5.0/compiler-rt-3.5.0.src.tar.xz
fi
if [ ! -e libcxx-3.5.0.src.tar.xz ]; then
wget http://llvm.org/releases/3.5.0/libcxx-3.5.0.src.tar.xz
fi
if [ ! -e libcxxabi-3.5.0.src.tar.xz ]; then
wget http://llvm.org/releases/3.5.0/libcxxabi-3.5.0.src.tar.xz
fi
if [ ! -e clang-tools-extra-3.5.0.src.tar.xz ]; then
wget http://llvm.org/releases/3.5.0/clang-tools-extra-3.5.0.src.tar.xz
fi
# Cleanup
echo "Cleaning up artifacts"
rm -rf llvm build llvm-3.5.0.src
# LLVM
echo "Unpacking LLVM"
tar xf llvm-3.5.0.src.tar.xz
mv llvm-3.5.0.src/ llvm
# Clang Front End
echo "Unpacking Clang Front End"
cd llvm/tools
tar xf ../../cfe-3.5.0.src.tar.xz
mv cfe-3.5.0.src clang
cd ../../
# Compiler RT
echo "Unpacking Compiler RT"
cd llvm/projects
tar xf ../../compiler-rt-3.5.0.src.tar.xz
mv compiler-rt-3.5.0.src/ compiler-rt
cd ../../
# Extra Tools
echo "Unpacking Extra Tools"
cd llvm/tools/clang/tools/
tar xf ../../../../clang-tools-extra-3.5.0.src.tar.xz
mv clang-tools-extra-3.5.0.src extra
cd ../../../../
# libc++
echo "Unpacking libc++"
cd llvm/projects
tar xf ../../libcxx-3.5.0.src.tar.xz
mv libcxx-3.5.0.src/ libcxx
cd ../../
# libc++ ABI
echo "Unpacking libc++ ABI"
cd llvm/projects
tar xf ../../libcxxabi-3.5.0.src.tar.xz
mv libcxxabi-3.5.0.src/ libcxxabi
cd ../../
# Determine if Apple
IS_DARWIN=`uname -s | egrep -i -c "Darwin"`
if [ $IS_DARWIN -ne 0 ]; then
OTHER_OPTIONS=" --enable-libcpp"
fi
# Configure
echo "Configuring build"
mkdir -p build
cd build
../llvm/configure --enable-optimized --enable-cxx11 --with-libcxx --with-libcxxabi $OTHER_OPTIONS --prefix=/usr/local
# Build
# 'make cxx' for libc++ is from http://libcxx.llvm.org/
echo "Running make"
make cxx
make -j2
RET=$?
if [ $RET -eq 0 ];then
echo "****************************************"
read -p "Press [ENTER] to install, or [CTRL]+C to quit"
sudo make install
fi
# ****************************************
# ****************************************
# Install does not install scan-build and scan-view
# Perform the copy, and/or put them on-path
#sudo cp llvm/projects/compiler-rt/lib/asan/scripts/asan_symbolize.py /usr/local/bin
#sudo 2to3 -w /usr/local/bin/asan_symbolize.py
#sudo mkdir /usr/local/bin/scan-build
#sudo cp -r llvm/tools/clang/tools/scan-build /usr/local/bin
#sudo mkdir /usr/local/bin/scan-view
#sudo cp -r llvm/tools/clang/tools/scan-view /usr/local/bin
答案 0 :(得分：3)
这是我用来构建libcxxabi和libcxx的脚本。它使用以前构建的Clang（使用GCC（在我的情况下为4.8.3）和GCC STL）：
if ( $#argv != 2 ) then
echo "Usage: [32|64] <directory>"
exit
endif
set echo on
set CMake=<CMake executable>
set GCCDir=<recent GCC directory>
set LLVMSourceDir=${PWD}/llvm-${LLVM_VERSION}.src
set LLVMOutOfTreeSourceDir=${PWD}
set LLVMPass1Dir=${PWD}/pass1
set PythonDir=<Python directory>
set InstallDir=${PWD}/$argv[2]
if ( $argv[1] == 32 ) then
set GCC_EHDir=${GCCDir}/lib/gcc/x86_64-redhat-linux/4.8.3/32
set BuildMode="-m32"
set LibDirSuffix=""
else
set GCC_EHDir=${GCCDir}/lib/gcc/x86_64-redhat-linux/4.8.3
set BuildMode="-m64"
set LibDirSuffix="64"
endif
set BuildDir=libcxxabi.build
if ( -d ${BuildDir} ) then
rm -rf ${BuildDir}
endif
mkdir ${BuildDir}
cd ${BuildDir}
${CMake} \
-DCMAKE_BUILD_TYPE="Release" \
-DCMAKE_INSTALL_PREFIX:PATH=${InstallDir} \
-DCMAKE_C_COMPILER=${LLVMPass1Dir}/bin/clang \
-DCMAKE_C_FLAGS=${BuildMode} \
-DCMAKE_CXX_COMPILER=${LLVMPass1Dir}/bin/clang++ \
-DCMAKE_CXX_FLAGS=${BuildMode} \
-DCMAKE_SHARED_LINKER_FLAGS="-L ${GCC_EHDir}" \
-DCMAKE_STATIC_LINKER_FLAGS="${GCC_EHDir}/libgcc_eh.a" \
-DLLVM_FORCE_USE_OLD_TOOLCHAIN=YES \
-DLLVM_PATH=${LLVMSourceDir} \
-DLIBCXXABI_LIBCXX_INCLUDES=${LLVMOutOfTreeSourceDir}/libcxx-${LLVM_VERSION}.src/include \
-DLIBCXXABI_LIBCXX_PATH=${LLVMOutOfTreeSourceDir}/libcxx-${LLVM_VERSION}.src \
-DLIBCXXABI_LIBDIR_SUFFIX=${LibDirSuffix} \
${LLVMOutOfTreeSourceDir}/libcxxabi-${LLVM_VERSION}.src
make
make install
cd ..
set BuildDir=libcxx.build
if ( -d ${BuildDir} ) then
rm -rf ${BuildDir}
endif
mkdir ${BuildDir}
cd ${BuildDir}
${CMake} \
-DCMAKE_BUILD_TYPE="Release" \
-DCMAKE_INSTALL_PREFIX:PATH=${InstallDir} \
-DCMAKE_C_COMPILER=${LLVMPass1Dir}/bin/clang \
-DCMAKE_C_FLAGS=${BuildMode} \
-DCMAKE_CXX_COMPILER=${LLVMPass1Dir}/bin/clang++ \
-DCMAKE_CXX_FLAGS=${BuildMode} \
-DCMAKE_SHARED_LINKER_FLAGS="-L ${GCCDir}/lib${LibDirSuffix}" \
-DLLVM_PATH=${LLVMSourceDir} \
-DLIBCXX_CXX_ABI=libcxxabi \
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${LLVMOutOfTreeSourceDir}/libcxxabi-${LLVM_VERSION}.src/include \
-DLIBCXX_CXX_ABI_LIBRARY_PATH=${InstallDir}/lib \
-DLIBCXX_LIBDIR_SUFFIX=${LibDirSuffix} \
-DLIT_EXECUTABLE=${LLVMSourceDir}/utils/lit/lit.py \
${LLVMOutOfTreeSourceDir}/libcxx-${LLVM_VERSION}.src
make
make install
cd ..
答案 1 :(得分：2)
libc ++和libc ++ abi不能与configure配合使用。我认为如果你正确调用libc ++可能会有效，但是即使是libc ++ abi的配置脚本也没有。
请参阅our docs了解如何在这些项目中使用cmake：
# In-tree build:
# Check out libcxx and libcxxabi into llvm/projects
cd llvm
mkdir build && cd build
cmake .. # Linux may require -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
make cxx