The error is due to clang using this header: /usr/include/powerpc64le-linux-gnu/c++/8/bits/c++config.h
The difference between this header for gcc7 and gcc8: --- /usr/include/powerpc64le-linux-gnu/c++/7/bits/c++config.h 2018-07-20 21:27:51.000000000 +0930 +++ /usr/include/powerpc64le-linux-gnu/c++/8/bits/c++config.h 2018-07-28 15:23:29.000000000 +0930 @@ -1550,7 +1531,7 @@ namespace std #define _GLIBCXX_USE_FCHMODAT 1 /* Define if __float128 is supported on this host. */ -/* #undef _GLIBCXX_USE_FLOAT128 */ +#define _GLIBCXX_USE_FLOAT128 1 /* Defined if gettimeofday is available. */ #define _GLIBCXX_USE_GETTIMEOFDAY 1 $ dpkg -S /usr/include/powerpc64le-linux-gnu/c++/8/bits/c++config.h libstdc++-8-dev:ppc64el: /usr/include/powerpc64le-linux-gnu/c++/8/bits/c++config.h $ apt-cache policy libstdc++-8-dev libstdc++-8-dev: Installed: 8.2.0-1ubuntu2 Upstream gcc has this change to c++config which would fix clang: /* Define if __float128 is supported on this host. */ #if defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__) #define _GLIBCXX_USE_FLOAT128 #endif https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=260043 PR libstdc++/84654 Disable __float128 specializations for -mno-float128 2018-05-01 Tulio Magno Quites Machado Filho <tul...@linux.vnet.ibm.com> PR libstdc++/84654 * acinclude.m4: Set ENABLE_FLOAT128 instead of _GLIBCXX_USE_FLOAT128. * config.h.in: Remove references to _GLIBCXX_USE_FLOAT128. * configure: Regenerate. * include/Makefile.am: Replace the value of _GLIBCXX_USE_FLOAT128 based on ENABLE_FLOAT128. * include/Makefile.in: Regenerate. * include/bits/c++config: Define _GLIBCXX_USE_FLOAT128. [!defined(__FLOAT128__) && !defined(__SIZEOF_FLOAT128__)]: Undefine _GLIBCXX_USE_FLOAT128. ** Bug watch added: GCC Bugzilla #84654 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84654 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1783705 Title: clang errors with __float128 is not supported on this target on ppc64le To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/llvm-defaults/+bug/1783705/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
