On Tue, 18 Jan 2022 at 10:29, Frantisek Zatloukal <fzatl...@redhat.com> wrote:
> > > On Fri, Jan 14, 2022 at 3:33 PM Jakub Jelinek <ja...@redhat.com> wrote: > >> If there are bugs on the compiler side, please let me know immediately, >> so that those bugs can be fixed before the mass rebuild next week. >> > > While I was trying to rebuild some Intel components, i've encountered this > issue, which seems to be caused by libstdc. It affects > intel-graphics-compiler (not yet in Fedora). That is compiled with clang, > however, since gcc/libstdc 12, I am hitting this: > > /builddir/build/BUILD/intel-graphics-compiler-igc-1.0.9933/IGC/VectorCompiler/lib/GenXCodeGen/GenXLiveness.cpp:590:46: > error: call to constructor of 'LiveRangeMap_t::value_type' (aka 'pair<const > llvm::genx::SimpleValue, llvm::genx::LiveRange *>') is ambiguous > auto [i, isInserted] = LiveRangeMap.insert(LiveRangeMap_t::value_type(V, > 0)); > ^ > ~~~~ > /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_pair.h:425:17: > note: candidate constructor [with _U1 = const llvm::genx::SimpleValue, _U2 > = llvm::genx::LiveRange *, $2 = true] > constexpr pair(const _T1& __a, const _T2& __b) > ^ > /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_pair.h:492:18: > note: candidate constructor [with _U1 = llvm::genx::SimpleValue &, $1 = > true] > constexpr pair(_U1&& __x, __null_ptr_constant) > ^ > 1 error generated. > > I've tried to locally recompile clang and llvm against the new libstdc (as > it seems ambiguousness is caused by #if _GLIBCXX_USE_DEPRECATED being met), > but that didn't help. Maybe I am missing some library that needs to be > recompiled too. Anyhow, is this expected behavior? > > The affected file is this one: > https://github.com/intel/intel-graphics-compiler/blob/master/IGC/VectorCompiler/lib/GenXCodeGen/GenXLiveness.cpp > I think the code is just wrong, and should use nullptr instead of 0 in that initializer on line 590. It's related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101124 though. I tried to keep that old incorrect code working, but apparently failed.
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