[Bug c++/79267] New: internal compiler error with -O3 or -O2 -finline-functions

[g.chauvat at laposte dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79267

            Bug ID: 79267
           Summary: internal compiler error with -O3 or -O2
                    -finline-functions
           Product: gcc
           Version: 6.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: g.chauvat at laposte dot net
  Target Milestone: ---

Created attachment 40614
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40614&action=edit
reduced preprocessed file

Hi,

The compilation of Nektar++ fails with an internal compiler error when using
-O3 or -O2 -finline-functions with g++ 6.3.1 on Arch Linux. It compiles well
with -O2.

- The full preprocessed file weighs 5 MB:
https://fichiers.fschhh.net/fichiers1/Interp.ii
a version reduced with creduce is attached, I hope it triggers the same
problem.


- compiler options:
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1/lto-wrapper
Cible : x86_64-pc-linux-gnu
Configuré avec: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --disable-multilib --disable-werror
--enable-checking=release
Modèle de thread: posix
gcc version 6.3.1 20170109 (GCC)

- log:
/home/guillaume/local/src/nektar++/library/LibUtilities/Foundations/Interp.cpp:
Dans la fonction « void Nektar::LibUtilities::Interp2D(const
Nektar::LibUtilities::PointsKey&, const Nektar::LibUtilities::PointsKey&, const
NekDouble*, const Nektar::LibUtilities::PointsKey&, const
Nektar::LibUtilities::PointsKey&, Nektar::NekDouble*) »:
/home/guillaume/local/src/nektar++/library/LibUtilities/Foundations/Interp.cpp:166:53:
erreur interne du compilateur : dans assign_temp, à function.c:961
                 I1 = PointsManager()[fpoints1]->GetI(tpoints1);
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~