Dmitry Golovin via llvm-dev
2016-Dec-02 12:57 UTC
[llvm-dev] Failed to configure LLVM for use with Musl
I want to build LLVM-based toolchain with Musl, I have LLVM sources with clang
and lld (under `tools` directory) and libunwind, compiler-rt, libcxx and
libcxxabi (under `projects` directory). All are the latest versions cloned from
GitHub mirror, branch `master`.
I'm trying to configure with the following options:
CLANG_DEFAULT_CXX_STDLIB = libc++
CLANG_DEFAULT_RTLIB = compiler-rt
LIBCXX_CXX_ABI = libcxxabi
LLVM_DEFAULT_TARGET_TRIPLE = x86_64-pc-linux-musl
LIBCXXABI_TARGET_TRIPLE = x86_64-pc-linux-musl
LIBUNWIND_TARGET_TRIPLE = x86_64-pc-linux-musl
DEFAULT_SYSROOT = /path/to/musl
GCC_INSTALL_PREFIX = /path/to/gcc-stub
LLVM_TARGETS_TO_BUILD = X86
LIBCXXABI_USE_COMPILER_RT = ON
LIBCXXABI_USE_LLVM_UNWINDER = ON
LIBCXX_HAS_MUSL_LIBC = ON
LIBCXX_USE_COMPILER_RT = ON
LLVM_ENABLE_LIBCXX = ON
LLVM_ENABLE_LLD = ON
When I try to configure, I get the following error messages:
CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message):
Can't specify libc++ with '-stdlib='
Call Stack (most recent call first):
cmake/config-ix.cmake:15 (include)
CMakeLists.txt:566 (include)
CMake Error at projects/libunwind/src/CMakeLists.txt:70 (message):
Compiler doesn't support generation of unwind tables if exception support
is disabled. Building libunwind DSO with runtime dependency on C++ ABI
library is not supported.
I'm probably doing something wrong, but I can't figure out what exactly.
If I omit some of the flags, I get different errors, but I never get successful
configuration.
I'm on Ubuntu 16.04 (if it is important) and have not yet tried on other
machines, but I'm pretty sure it is possible to reproduce it.
Regards,
Dmitry Golovin
Vedant Kumar via llvm-dev
2016-Dec-02 21:28 UTC
[llvm-dev] Failed to configure LLVM for use with Musl
> On Dec 2, 2016, at 4:57 AM, Dmitry Golovin via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > I want to build LLVM-based toolchain with Musl, I have LLVM sources with clang and lld (under `tools` directory) and libunwind, compiler-rt, libcxx and libcxxabi (under `projects` directory). All are the latest versions cloned from GitHub mirror, branch `master`. > > I'm trying to configure with the following options: > CLANG_DEFAULT_CXX_STDLIB = libc++ > CLANG_DEFAULT_RTLIB = compiler-rt > LIBCXX_CXX_ABI = libcxxabi > LLVM_DEFAULT_TARGET_TRIPLE = x86_64-pc-linux-musl > LIBCXXABI_TARGET_TRIPLE = x86_64-pc-linux-musl > LIBUNWIND_TARGET_TRIPLE = x86_64-pc-linux-musl > DEFAULT_SYSROOT = /path/to/musl > GCC_INSTALL_PREFIX = /path/to/gcc-stub > LLVM_TARGETS_TO_BUILD = X86 > LIBCXXABI_USE_COMPILER_RT = ON > LIBCXXABI_USE_LLVM_UNWINDER = ON > LIBCXX_HAS_MUSL_LIBC = ON > LIBCXX_USE_COMPILER_RT = ON > LLVM_ENABLE_LIBCXX = ON > LLVM_ENABLE_LLD = ON > > When I try to configure, I get the following error messages: > > CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message): > Can't specify libc++ with '-stdlib=' > Call Stack (most recent call first): > cmake/config-ix.cmake:15 (include) > CMakeLists.txt:566 (include)^ This seems harmless. You'll probably end up building with libstdc++.> > CMake Error at projects/libunwind/src/CMakeLists.txt:70 (message): > Compiler doesn't support generation of unwind tables if exception support > is disabled. Building libunwind DSO with runtime dependency on C++ ABI > library is not supported.It looks like your host compiler doesn't support -funwind-tables. Try building with clang? I've CC'd Saleem who might know more about this. best, vedant> > I'm probably doing something wrong, but I can't figure out what exactly. If I omit some of the flags, I get different errors, but I never get successful configuration. > > I'm on Ubuntu 16.04 (if it is important) and have not yet tried on other machines, but I'm pretty sure it is possible to reproduce it. > > Regards, > Dmitry Golovin > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
Saleem Abdulrasool via llvm-dev
2016-Dec-03 05:10 UTC
[llvm-dev] Failed to configure LLVM for use with Musl
On Fri, Dec 2, 2016 at 1:28 PM, Vedant Kumar <vsk at apple.com> wrote:> > > On Dec 2, 2016, at 4:57 AM, Dmitry Golovin via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > > > > I want to build LLVM-based toolchain with Musl, I have LLVM sources with > clang and lld (under `tools` directory) and libunwind, compiler-rt, libcxx > and libcxxabi (under `projects` directory). All are the latest versions > cloned from GitHub mirror, branch `master`. > > > > I'm trying to configure with the following options: > > CLANG_DEFAULT_CXX_STDLIB = libc++ > > CLANG_DEFAULT_RTLIB = compiler-rt > > LIBCXX_CXX_ABI = libcxxabi > > LLVM_DEFAULT_TARGET_TRIPLE = x86_64-pc-linux-musl > > LIBCXXABI_TARGET_TRIPLE = x86_64-pc-linux-musl > > LIBUNWIND_TARGET_TRIPLE = x86_64-pc-linux-musl > > DEFAULT_SYSROOT = /path/to/musl > > GCC_INSTALL_PREFIX = /path/to/gcc-stub > > LLVM_TARGETS_TO_BUILD = X86 > > LIBCXXABI_USE_COMPILER_RT = ON > > LIBCXXABI_USE_LLVM_UNWINDER = ON > > LIBCXX_HAS_MUSL_LIBC = ON > > LIBCXX_USE_COMPILER_RT = ON > > LLVM_ENABLE_LIBCXX = ON > > LLVM_ENABLE_LLD = ON > > > > When I try to configure, I get the following error messages: > > > > CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message): > > Can't specify libc++ with '-stdlib=' > > Call Stack (most recent call first): > > cmake/config-ix.cmake:15 (include) > > CMakeLists.txt:566 (include) > > ^ This seems harmless. You'll probably end up building with libstdc++. > > > > > CMake Error at projects/libunwind/src/CMakeLists.txt:70 (message): > > Compiler doesn't support generation of unwind tables if exception > support > > is disabled. Building libunwind DSO with runtime dependency on C++ ABI > > library is not supported. > > It looks like your host compiler doesn't support -funwind-tables. >Hmm, so we try to generate unwind tables without exceptions as we don't want to use exceptions in the unwinding code path itself. It sounds like your compiler might not support `-fno-exceptions -funwind-tables` together although it supports them together. What target are you building libunwind for? Linux x86, x86_64 use a DWARF-esque encoding in eh_frame. However, other targets need unwind tables with custom information. Perhaps we are being too stringent here. At least libitm uses both these flags together with gcc, so it and clang should support this.> Try building with clang? >That should work. I've CC'd Saleem who might know more about this.> > best, > vedant > > > > > I'm probably doing something wrong, but I can't figure out what exactly. > If I omit some of the flags, I get different errors, but I never get > successful configuration. > > > > I'm on Ubuntu 16.04 (if it is important) and have not yet tried on other > machines, but I'm pretty sure it is possible to reproduce it. > > > > Regards, > > Dmitry Golovin > > _______________________________________________ > > LLVM Developers mailing list > > llvm-dev at lists.llvm.org > > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev > >-- Saleem Abdulrasool compnerd (at) compnerd (dot) org -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20161202/81bf7610/attachment.html>