Cross compiling on ppc64le architecture.[Question]

[Sunidhi-Gaonkar1]

Hi Team, I am attempting to cross compile Tinygo to build binaries for Power Linux (ppc64le) platform. Tinygo is used to run unit and integration tests by aquasecurity/trivy (https://github.com/aquasecurity/trivy). So far I have followed the steps mentioned below: 1.Installed the dependencies mentioned here: https://github.com/tinygo-org/tinygo/blob/release/BUILDING.md 2.Installed qemu and powerpc64le-linux-gnu. 3.Downloaded llvm source.

The command make llvm-build fails with following error:

[9/3024] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o
/usr/bin/clang++ -DGTEST_HAS_RTTI=0 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/user5/tinygo/llvm-build/lib/Support -I/home/user5/tinygo/llvm-project/llvm/lib/Support -I/home/user5/tinygo/llvm-build/include -I/home/user5/tinygo/llvm-project/llvm/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fdiagnostics-color -ffunction-sections -fdata-sections -Werror=global-constructors -O3 -DNDEBUG -std=c++14  -fno-exceptions -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o -c /home/user5/tinygo/llvm-project/llvm/lib/Support/APFloat.cpp
In file included from /home/user5/tinygo/llvm-project/llvm/lib/Support/APFloat.cpp:14:
In file included from /home/user5/tinygo/llvm-project/llvm/include/llvm/ADT/APFloat.h:19:
In file included from /home/user5/tinygo/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:15:
In file included from /home/user5/tinygo/llvm-project/llvm/include/llvm/ADT/STLExtras.h:20:
In file included from /home/user5/tinygo/llvm-project/llvm/include/llvm/ADT/Optional.h:21:
/home/user5/tinygo/llvm-project/llvm/include/llvm/ADT/STLForwardCompat.h:53:22: error: default initialization of an object of const type 'const llvm::in_place_t' without a user-provided default constructor
constexpr in_place_t in_place; // NOLINT(readability-identifier-naming)
                     ^
                             {}
1 error generated.
[12/3024] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o
ninja: build stopped: subcommand failed.
Makefile:249: recipe for target 'llvm-build' failed
make: *** [llvm-build] Error 1

Additional information: Operating System: Ubuntu 16.04.7 LTS Kernel: Linux 4.4.0-190-generic Architecture: x86-64

Any pointers would be helpful.Thank you.

[aykevl]

Ubuntu 16.04.7 LTS

That's a very old Linux distribution. I expect the GCC version is way out of date. Note that LLVM requires at least GCC version 7.1.0. Check gcc --version to be sure.

2.Installed qemu and powerpc64le-linux-gnu.

Why do you install powerpc64le-linux-gnu?

Hi Team, I am attempting to cross compile Tinygo to build binaries for Power Linux (ppc64le) platform.

"Cross compile TinyGo"? Maybe there is a misunderstanding but TinyGo usually doesn't need to be cross compiled. Just compile wherever you need it to run and then once you have a working tinygo binary, you can pick a build target using GOOS and GOARCH (just like the regular Go toolchain). If you mean to build binaries for linux/ppc64le, note that this is not yet supported in TinyGo.

[aykevl]

Actually, it looks like you're using Clang (not GCC). What's the output of clang --version?

[Sunidhi-Gaonkar1]

Thank you for the quick response and sorry for the confusion. This is related to https://github.com/tinygo-org/tinygo/issues/3041. I am trying to build binaries for linux/ppc64le by modifying Github actions workflows and cross compilation done similar to arm and arm64 Linux builds.

Why do you install powerpc64le-linux-gnu?

I have installed powerpc64le-linux-gnu as it provides packages required for cross-compilation.

Below is the output for gcc --version and clang --version

$ gcc --version
gcc (Ubuntu 7.3.0-23ubuntu2~16.04.york0) 7.3.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.

$ clang --version
clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

[aykevl]

Thank you, now I better understand the situation.

Can you describe exactly which steps you took? Including all commands? I see that you are building using Clang, so it appears you have modified CC at least.

[aykevl]

For cross compiling, you'll probably want to:

1. Remove llvm-build (to make sure you start fresh)
2. Run make llvm-build CROSS=powerpc64le-linux-gnu to build LLVM
3. Run make CROSS=powerpc64le-linux-gnu to build TinyGo

But make sure this GCC version is new enough, check powerpc64le-linux-gnu-gcc --version.