32-bit powerpc system-clang based builds of devel/llvm40 and devel/llvm50: fails via "Host compiler appears to require libatomic, but cannot find it"

[Roman Divacky]

The cmake test just tries to compile:

#include <atomic>
std::atomic<int> x;
int main() {
  return x;
}

What happens if you try to compile this small code with your host compiler?

Roman

On Tue, Dec 05, 2017 at 10:42:49AM -0800, Mark Millard wrote:
> [I experiment with system-clang based
> buildworld and/or buildkernel based
> TARGET_ARCH=powerpc64 and
> TARGET_ARCH=powerpc environments.]
> 
> For TARGET_ARCH=powerpc devel/llvm40 and
> devel/llvm50 get failure reports like:
> 
> -- Looking for __atomic_load_8 in atomic - not found
> CMake Error at cmake/modules/CheckAtomic.cmake:74 (message):
>   Host compiler appears to require libatomic, but cannot find it.
> Call Stack (most recent call first):
>   cmake/config-ix.cmake:307 (include)
>   CMakeLists.txt:582 (include)
> 
> 
> I had tried to avoid any need for 8-Byte atomics
> (among other things) by avoiding LIT, LLD, and LLDB:
> 
> # more /usr/local/etc/poudriere.d/options/devel_llvm50/options
> # This file is auto-generated by 'make config'.
> # Options for llvm50-5.0.0_1
> _OPTIONS_READ=llvm50-5.0.0_1
> _FILE_COMPLETE_OPTIONS_LIST=CLANG DOCS EXTRAS LIT LLD LLDB
> OPTIONS_FILE_SET+=CLANG
> OPTIONS_FILE_SET+=DOCS
> OPTIONS_FILE_SET+=EXTRAS
> OPTIONS_FILE_UNSET+=LIT
> OPTIONS_FILE_UNSET+=LLD
> OPTIONS_FILE_UNSET+=LLDB
> 
> # more /usr/local/etc/poudriere.d/options/devel_llvm40/options
> # This file is auto-generated by 'make config'.
> # Options for llvm40-4.0.1_1
> _OPTIONS_READ=llvm40-4.0.1_1
> _FILE_COMPLETE_OPTIONS_LIST=CLANG DOCS EXTRAS LIT LLD LLDB
> OPTIONS_FILE_SET+=CLANG
> OPTIONS_FILE_SET+=DOCS
> OPTIONS_FILE_SET+=EXTRAS
> OPTIONS_FILE_UNSET+=LIT
> OPTIONS_FILE_UNSET+=LLD
> OPTIONS_FILE_UNSET+=LLDB
> 
> For clang-based buildworld avoiding such things
> prevents running into the 8-Byte atomics based
> build failures:
> 
> WITH_LIBCPLUSPLUS=
> WITH_BINUTILS_BOOTSTRAP=
> WITH_ELFTOOLCHAIN_BOOTSTRAP=
> #WITH_CLANG_BOOTSTRAP=
> WITH_CLANG=
> WITH_CLANG_IS_CC=
> WITH_CLANG_FULL=
> WITH_CLANG_EXTRAS=
> WITH_LLD=
> # lldb requires missing atomic 8-byte operations for powerpc (non-64)
> WITHOUT_LLDB=
> #
> WITH_BOOT=
> 
> (Note: buildkernel currently fails.)
> 
> # clang++ --version
> FreeBSD clang version 5.0.0 (tags/RELEASE_500/final 312559) (based on LLVM 5.0.0svn)
> Target: powerpc-unknown-freebsd12.0
> Thread model: posix
> InstalledDir: /usr/bin
> 
> # uname -apKU
> FreeBSD FBSDG4S 12.0-CURRENT FreeBSD 12.0-CURRENT  r326192M  powerpc powerpc 1200054 1200054
> 
> # svnlite info /usr/ports/ | grep "Re[plv]"
> Relative URL: ^/head
> Repository Root: https://svn.freebsd.org/ports
> Repository UUID: 35697150-7ecd-e111-bb59-0022644237b5
> Revision: 455204
> Last Changed Rev: 455204
> 
> 
> ===
> Mark Millard
> markmi at dsl-only.net
> 
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