Unable to compile on Alpine Linux

[lotusdew1980]

Dear Experts,

I am trying to compile opencilk on Alpine Linux. My main reason for doing so is the small footprint of Alpine. I am also open to suggestions of other distros where it might be easier. The main issue seems to be the glibc replacement in Alpine musl does not have backtrace. I installed libunwind to fix this but I am stuck trying to make it work. Seems the issue is mainly with optional tooling.

[ 23%] Linking CXX shared library ../../../../../lib/clang/14.0.6/lib/linux/libclang_rt.scudo_standalone-x86_64.so
-- Performing Test COMPILER_RT_HAS_XRAY_COMPILER_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_ATOMIC_KEYWORD
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: -- Performing Test COMPILER_RT_HAS_ATOMIC_KEYWORD - Success
-- Performing Test COMPILER_RT_HAS_FLOAT16
../../gwp_asan/CMakeFiles/RTGwpAsanBacktraceLibc.x86_64.dir/optional/backtrace_linux_libc.cpp.o: in function `(anonymous namespace)::SegvBacktrace(unsigned long*, unsigned long, void*)':
/home/deskman/opencilk/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp:25: undefined reference to `backtrace'
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ../../gwp_asan/CMakeFiles/RTGwpAsanBacktraceLibc.x86_64.dir/optional/backtrace_linux_libc.cpp.o: in function `(anonymous namespace)::Backtrace(unsigned long*, unsigned long)':
/home/deskman/opencilk/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp:25: undefined reference to `backtrace'
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ../../gwp_asan/CMakeFiles/RTGwpAsanBacktraceLibc.x86_64.dir/optional/backtrace_linux_libc.cpp.o: in function `(anonymous namespace)::PrintBacktrace(unsigned long*, unsigned long, void (*)(char const*, ...))':
/home/deskman/opencilk/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp:44: undefined reference to `backtrace_symbols'
collect2: error: ld returned 1 exit status
make[2]: *** [projects/compiler-rt/lib/scudo/standalone/CMakeFiles/clang_rt.scudo_standalone-dynamic-x86_64.dir/build.make:295: lib/clang/14.0.6/lib/linux/libclang_rt.scudo_standalone-x86_64.so] Error 1
make[1]: *** [CMakeFiles/Makefile2:27652: projects/compiler-rt/lib/scudo/standalone/CMakeFiles/clang_rt.scudo_standalone-dynamic-x86_64.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Can someone please suggest a way forward or advise if I should abandon trying to do this on Alpine Linux ?

[VoxSciurorum]

See if this patch helps: llvm/llvm-project@d6906be

If not I will look more closely.

[lotusdew1980]

I am sorry but I dont really understand where exactly to apply this patch. You want me to make the following changes to the files within opencilk ?

Should I make these changes on the files under ~/opencilk/compiler-rt/cmake aka apply the patch ?

[lotusdew-dushyant-goel]

After making the changes in the patch under ~/opencilk/compiler-rt/cmake as @VoxSciurorum and @lotusdew1980 lotsudew suggested, I am able to move past the (exec.h) error.

But the build still fails with the following error:

CMake Error at /root/opencilk/cheetah/cmake/config-ix.cmake:48 (message):
  Please use architecture with 4 or 8 byte pointers.
Call Stack (most recent call first):
  /root/opencilk/cheetah/CMakeLists.txt:149 (include)

-- Configuring incomplete, errors occurred!

See also "${pwd}/build/runtimes/runtimes-bins/CMakeFiles/CMakeOutput.log".
See also "${pwd}/build/runtimes/runtimes-bins/CMakeFiles/CMakeError.log".
make[2]: *** [runtimes/CMakeFiles/runtimes.dir/build.make:91: runtimes/runtimes-stamps/runtimes-configure] Error 1
make[1]: *** [CMakeFiles/Makefile2:91549: runtimes/CMakeFiles/runtimes.dir/all] Error 2
make: *** [Makefile:156: all] Error 2

The outpu8t under CMakeError.log is as follows:

    Checking whether the ASM compiler is GNU using "--version" did not match "(GNU assembler)|(GCC)|(Free Software                  Foundation)":
    clang version 14.0.6 (https://github.com/OpenCilk/opencilk-project fc90ded2b090672f84c58d12d8d85cd999eb6c1a)
    Target: x86_64-unknown-linux-gnu
    Thread model: posix
    InstalledDir: ${pwd}/build/./bin
    Detecting C compiler ABI info failed to compile with the following output:
    Change Dir: ${pwd}/build/runtimes/runtimes-bins/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/usr/bin/make -f Makefile cmTC_2a6c0/fast && make[3]: Entering directory '${pwd}/build/runtimes/            runtimes-bins/CMakeFiles/CMakeTmp'
   /usr/bin/make  -f CMakeFiles/cmTC_2a6c0.dir/build.make CMakeFiles/cmTC_2a6c0.dir/build
   make[4]: Entering directory '${pwd}/build/runtimes/runtimes-bins/CMakeFiles/CMakeTmp'
   Building C object CMakeFiles/cmTC_2a6c0.dir/CMakeCCompilerABI.c.o
   ${pwd}/build/./bin/clang --target=x86_64-unknown-linux-gnu   -v -MD -MT CMakeFiles/cmTC_2a6c0.dir/CMakeCCompilerABI.c.o -        MF CMakeFiles/cmTC_2a6c0.dir/CMakeCCompilerABI.c.o.d -o CMakeFiles/cmTC_2a6c0.dir/CMakeCCompilerABI.c.o -c /usr/share/          cmake/Modules/CMakeCCompilerABI.c
   clang version 14.0.6 (https://github.com/OpenCilk/opencilk-project fc90ded2b090672f84c58d12d8d85cd999eb6c1a)
   Target: x86_64-unknown-linux-gnu
   Thread model: posix
   InstalledDir: ${pwd}/build/./bin
    (in-process)

Any suggestion?
The architecture and processor are:

Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:             48 bits physical, 48 bits virtual
  Byte Order:                  Little Endian
  
CPU Model name:            AMD Ryzen Threadripper PRO 5995WX 64-Cores

[VoxSciurorum]

It looks like llvm 14, the base used for the latest version of OpenCilk, does not build on Alpine Linux. You can get past the backtrace problem by removing the unsupported library calls. The false error from CMake remains. I was able to build llvm 15 on Alpine. I did not see any changes that were practical to backport, or even anything that was clearly related to Alpine. I also did not find the source code for the Alpine llvm packages. A repository claiming to be the source did not work for me.

I think you are out of luck for now. We hope to base the next major release of OpenCilk off of llvm 15 or 16 and it might work on Alpine.

[lotusdew1980]

@VoxSciurorum : Thank you very much for your guidance. I guess we will just switch to a different distribution to make opencilk work for us.

[neboat]

Hey @lotusdew1980 , we have just tagged a release candidate for a new version of OpenCilk, based on LLVM 16: https://github.com/OpenCilk/opencilk-project/releases/tag/opencilk%2Fv2.1-rc1. I'm wondering if this new version resolves the build issues you were seeing before.

If you have a chance, please let us know if you're able to build this new version of OpenCilk on Alpine Linux.