[SYCL] Compilation Error when building the compiler for x86 target

[crtrott]

Following the instruction to build the compiler for x86 I am running into this compilation error:

/home/crtrott/Software/llvm-intel/sycl/source/detail/os_util.cpp: In static member function ‘static void* cl::sycl::detail::OSUtil::alignedAlloc(size_t, size_t)’:
/home/crtrott/Software/llvm-intel/sycl/source/detail/os_util.cpp:101:43: error: ‘aligned_alloc’ was not declared in this scope
   return aligned_alloc(Alignment, NumBytes);

Configure:

cmake -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86" \
-DLLVM_EXTERNAL_PROJECTS="llvm-spirv;sycl" \
-DLLVM_ENABLE_PROJECTS="clang;llvm-spirv;sycl" \
-DLLVM_EXTERNAL_SYCL_SOURCE_DIR=/home/crtrott/Software/llvm-intel/sycl \
-DLLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR=/home/crtrott/Software/llvm-intel/llvm-spirv \
-DCMAKE_INSTALL_PREFIX=/home/projects/x86-64/clang/intel/2019-09-17 \
/home/crtrott/Software/llvm-intel/llvm

[crtrott]

Oh I should have said this is if you just type make -j.
The building with make -j sycl-toolchain I run into a different issue:

/home/crtrott/Software/llvm-intel/llvm/include/llvm/Support/Error.h:331:39:   required from ‘llvm::Error llvm::make_error(ArgTs&& ...) [with ErrT = llvm::RemarkSetupPatternError; ArgTs = {llvm::Error}]’
/home/crtrott/Software/llvm-intel/llvm/lib/IR/RemarkStreamer.cpp:151:62:   required from here
/home/crtrott/Software/llvm-intel/llvm/include/llvm/IR/RemarkStreamer.h:79:56: error: use of deleted function ‘llvm::Error::Error(const llvm::Error&)’
   using RemarkSetupErrorInfo<RemarkSetupPatternError>::RemarkSetupErrorInfo

[crtrott]

Actually both errors seem to appear. The first one regarding aligned_alloc goes away if you just keep repeating the make command? It did after a clean appear even when you just build the sycl-toolchain.

[bader]

@crtrott, could check that your environment satisfies these pre-requisites - https://github.com/intel/llvm/blob/sycl/sycl/doc/GetStartedWithSYCLCompiler.md#prerequisites, please?

If so, could you provide the logs from "configure" and "make" steps?

[crtrott]

Environment:

[crtrott@apollo build]$ uname -a
Linux apollo.sandia.gov 2.6.32-754.14.2.el6.x86_64 #1 SMP Wed Apr 24 16:18:30 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux
[crtrott@apollo build]$ cmake --version
cmake version 3.12.2

CMake suite maintained and supported by Kitware (kitware.com/cmake).
[crtrott@apollo build]$ g++ --version
g++ (GCC) 7.3.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[crtrott@apollo build]$ python
python            python2.6         python2.7-config  python-config     
python2           python2.7         python2-config    pythontex         
[crtrott@apollo build]$ python --version
Python 2.7.9
[crtrott@apollo build]$ git --version
git version 2.10.1

Configure:

-- The C compiler identification is GNU 7.3.0
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-- Check for working C compiler: /projects/sems/install/rhel6-x86_64/sems/compiler/gcc/7.3.0/base/bin/gcc -- works
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OpenCL_INCLUDE_DIRS is missed. Will try to download OpenCL headers from github.com
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CMake Warning (dev) at /home/crtrott/Software/llvm-intel/llvm/cmake/modules/AddLLVM.cmake:15 (message):
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Call Stack (most recent call first):
  /home/crtrott/Software/llvm-intel/llvm/cmake/modules/AddLLVM.cmake:769 (llvm_update_compile_flags)
  /home/crtrott/Software/llvm-intel/llvm/cmake/modules/AddLLVM.cmake:1145 (add_llvm_executable)
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Install the project...
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/home/crtrott/Software/llvm-intel/sycl/source/detail/os_util.cpp: In static member function ‘static void* cl::sycl::detail::OSUtil::alignedAlloc(size_t, size_t)’:
/home/crtrott/Software/llvm-intel/sycl/source/detail/os_util.cpp:101:10: error: ‘aligned_alloc’ was not declared in this scope
   return aligned_alloc(Alignment, NumBytes);
          ^~~~~~~~~~~~~
/home/crtrott/Software/llvm-intel/sycl/source/detail/os_util.cpp:101:10: note: suggested alternative: ‘alignedAlloc’
   return aligned_alloc(Alignment, NumBytes);
          ^~~~~~~~~~~~~
          alignedAlloc
make[2]: *** [tools/sycl/source/CMakeFiles/sycl.dir/detail/os_util.cpp.o] Error 1
make[2]: Target `tools/sycl/source/CMakeFiles/sycl.dir/build' not remade because of errors.
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[alexbatashev]

@crtrott can you please try this small hack?

diff --git a/sycl/source/detail/os_util.cpp b/sycl/source/detail/os_util.cpp
index e6081c9104e..6619096213f 100644
--- a/sycl/source/detail/os_util.cpp
+++ b/sycl/source/detail/os_util.cpp
@@ -98,7 +98,9 @@ size_t OSUtil::getOSMemSize() {

 void *OSUtil::alignedAlloc(size_t Alignment, size_t NumBytes) {
 #if defined(SYCL_RT_OS_LINUX)
-  return aligned_alloc(Alignment, NumBytes);
+  void *Addr;
+  posix_memalign(&Addr, Alignment, NumBytes);
+  return Addr;
 #elif defined(SYCL_RT_OS_WINDOWS)
   return _aligned_malloc(NumBytes, Alignment);
 #endif

[crtrott]

It build!

[alexbatashev]

It build!

@crtrott good to hear! Can you please tell me more about your Linux distro? What it's called and can I get it somewhere? I used this hack to build runtime on macOS, so I'm wondering why you need it on Linux too.

[crtrott]

This is more or less vanilla RedHat 6. But we install additional modules (using the 'module' package management system) which adds newer compilers and everything else.

[alexbatashev]

This is more or less vanilla RedHat 6. But we install additional modules (using the 'module' package management system) which adds newer compilers and everything else.

Strange... aligned_alloc should have worked. Anyway, I'm happy it is finally built.

[jbrodman]

I think I had to force the global namespace once for something like this: ::aligned_alloc.

…

On Wed, Sep 18, 2019 at 11:23 AM Alexander Batashev < ***@***.***> wrote: This is more or less vanilla RedHat 6. But we install additional modules (using the 'module' package management system) which adds newer compilers and everything else. Strange... aligned_alloc should have worked. Anyway, I'm happy it is finally built. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#646?email_source=notifications&email_token=AAOWWASEPGXEOUUCKPJ3E23QKJIZRA5CNFSM4IXRKBX2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD7AUR2Y#issuecomment-532760811>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAOWWAVH2WJ433K7AOID7TTQKJIZRANCNFSM4IXRKBXQ> .

[bader]

It looks like aligned_alloc in C++ is C++17 feature.
https://en.cppreference.com/w/cpp/memory/c/aligned_alloc.

[crtrott]

Yes aligned_alloc is part of C++17 (which sucks in C11). I didn't try to compile the compiler with GCC 9 though, so I didn't use a compiler which would enable C++17. I mean you could change your requirements to ask for C++17 compiler - it is not completely unreasonable to do so. But then you should also enforce C++17 in your CMakeList.

[alexbatashev]

Yes aligned_alloc is part of C++17 (which sucks in C11). I didn't try to compile the compiler with GCC 9 though, so I didn't use a compiler which would enable C++17. I mean you could change your requirements to ask for C++17 compiler - it is not completely unreasonable to do so. But then you should also enforce C++17 in your CMakeList.

I use exactly the same GCC version as you on daily basis and I see no problems. But my machine runs Ubuntu 18.04. Buildbot machines use GCC 7.4.0. Which is also far away from 9. I've also had positive experience with GCC 5.5.0. This is why that fail looks strange to me.

[jbrodman]

std::aligned_malloc is c++17, ::aligned_malloc is c11

…

On Wed, Sep 18, 2019 at 12:30 PM Christian Trott ***@***.***> wrote: Yes aligned_alloc is part of C++17 (which sucks in C11). I didn't try to compile the compiler with GCC 9 though, so I didn't use a compiler which would enable C++17. I mean you could change your requirements to ask for C++17 compiler - it is not completely unreasonable to do so. But then you should also enforce C++17 in your CMakeList. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#646?email_source=notifications&email_token=AAOWWAUHRDZ5HDKPTUZRHTLQKJQUXA5CNFSM4IXRKBX2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD7A2ZCY#issuecomment-532786315>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAOWWAQYIUAB7EWUM464JRDQKJQUXANCNFSM4IXRKBXQ> .