[cfe-dev] clang built from source in Mac OSX 10.14 with apple-clang/Xcode missing stdlib from include search path

[Jens Jorgensen via cfe-dev]

Hmmm, unfortunately I don't use libc++.

On 12/15/19 2:31 AM, Arthur O'Dwyer wrote:
> On Tue, Dec 10, 2019 at 10:09 PM Jens Jorgensen via cfe-dev
> <cfe-dev at lists.llvm.org <mailto:cfe-dev at lists.llvm.org>> wrote:
>
>     Apply my patch and build like :
>
>     cmake -DLLVM_ENABLE_PROJECTS=clang -G "Unix Makefiles"
>     -DCMAKE_BUILD_TYPE=Release
>     -DCLANG_XCODE_TOOLCHAIN_ROOT=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
>     ../llvm-project/llvm
>
>
> Using Jens' patch (attached), I managed to get `make clang` to build.
> However, I still can't get `make cxx` to build.
>
> cmake -G "Ninja" -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi"
> -DCMAKE_BUILD_TYPE=RelWithDebInfo \
>    
> -DCLANG_XCODE_TOOLCHAIN_ROOT=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
> \
>     ../llvm
> ninja cxx
>
> [223/272] Linking CXX shared library lib/libc++abi.1.0.dylib
> FAILED: lib/libc++abi.1.0.dylib
> [...snip...]
> Undefined symbols for architecture x86_64:
>   "__ZTIDu", referenced from:
>      -exported_symbol[s_list] command line option
>   "__ZTIPDu", referenced from:
>      -exported_symbol[s_list] command line option
>   "__ZTIPKDu", referenced from:
>      -exported_symbol[s_list] command line option
>   "typeinfo for __float128 const*", referenced from:
>      -exported_symbol[s_list] command line option
>   "typeinfo for __int128 const*", referenced from:
>      -exported_symbol[s_list] command line option
>   "typeinfo for unsigned __int128 const*", referenced from:
>      -exported_symbol[s_list] command line option
> [...snip...]
>
> Then I tried adding `compiler-rt` to LLVM_ENABLE_PROJECTS and building
> `ninja compiler-rt`, but it also errors:
>
> cmake -G "Ninja"
> -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi;compiler-rt"
> -DCMAKE_BUILD_TYPE=RelWithDebInfo \
>    
> -DCLANG_XCODE_TOOLCHAIN_ROOT=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
> \
>     -DCOMPILER_RT_HAS_WNON_VIRTUAL_DTOR_FLAG=yes \
>     ../llvm
> ninja compiler-rt
>
> [533/839] Building CXX object
> projects/compiler-rt/lib/tsan/CMakeFiles/clang_rt.tsan_osx_dynamic.dir/rtl/tsan_interceptors_mac.cpp.o
> [...]/llvm-project/compiler-rt/lib/tsan/rtl/tsan_interceptors_mac.cpp:26:10:
> fatal error: 'os/lock.h' file not found
> #include <os/lock.h>
>          ^
> 1 error generated.
>
> Anyone got any tips for building libc++ on Mac OSX?
>
> –Arthur

-- 
Jens B. Jorgensen
jbj1 at ultraemail.net

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