[Bug debug/70578] internal compiler error: in output_index_string, at dwarf2out.c with -gsplit-dwarf

["ishikawa at yk dot rim.or.jp" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70578

--- Comment #6 from ishikawa,chiaki <ishikawa at yk dot rim.or.jp> ---
(In reply to ishikawa,chiaki from comment #5)
> I have found that g++-5 can compile this without ICE.
> So this is a regression in gcc-6.
> 
> The version that worked is:
> 
> g++-5 -v
> Using built-in specs.
> COLLECT_GCC=g++-5
> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
> Target: x86_64-linux-gnu
> Configured with: ../src/configure -v --with-pkgversion='Debian 5.4.1-4'
> --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs
> --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
> --program-suffix=-5 --enable-shared --enable-linker-build-id
> --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
> --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
> --enable-libstdcxx-debug --enable-libstdcxx-time=yes
> --with-default-libstdcxx-abi=new --enable-gnu-unique-object
> --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
> --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo
> --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home
> --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64
> --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64
> --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
> --enable-objc-gc --enable-multiarch --with-arch-32=i686 --with-abi=m64
> --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
> --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
> --target=x86_64-linux-gnu
> Thread model: posix
> gcc version 5.4.1 20161202 (Debian 5.4.1-4) 
> ishikawa@debian-vbox-ci:/tmp$

Ouch, NO.

GCC-5 is also vulnerable.

gcc-5 also experienced an ICE on a different source file.
So it is a problem with deeper root.


/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/media/libvpx/libvpx/vp9/decoder/vp9_dsubexp.c:72:1:
internal compiler error: in output_index_string, at dwarf2out.c:22895
 }
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.

In the directory  /home/ishikawa/objdir-tb3/media/libvpx
The following command failed to execute properly:
/usr/bin/ccache /usr/bin/gcc-5 -std=gnu99 -o vp9_dsubexp.o -c
-I/home/ishikawa/objdir-tb3/dist/system_wrappers -include
/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/config/gcc_hidden.h
-DNDEBUG=1 -DTRIMMED=1 -DHAVE_CONFIG_H=vpx_config.h
-I/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/media/libvpx
-I/home/ishikawa/objdir-tb3/media/libvpx
-I/home/ishikawa/objdir-tb3/dist/include
-I/home/ishikawa/objdir-tb3/dist/include/nspr
-I/home/ishikawa/objdir-tb3/dist/include/nss -fPIC -include
/home/ishikawa/objdir-tb3/mozilla-config.h -DMOZILLA_CLIENT -MD -MP -MF
.deps/vp9_dsubexp.o.pp -Wall -Wempty-body -Wignored-qualifiers -Wpointer-arith
-Wsign-compare -Wtype-limits -Wunreachable-code -Wno-error=maybe-uninitialized
-Wno-error=deprecated-declarations -Wno-error=array-bounds -fno-builtin-strlen
-Wl,--gdb-index -Dfdatasync=fdatasync -DDEBUG_4GB_CHECK -DUSEHELGRIND=1
-Werror=sign-compare -fno-strict-aliasing -fno-math-errno -pthread -pipe
-gsplit-dwarf -g3 -Og -freorder-blocks -fno-omit-frame-pointer
-I/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/media/libvpx/config/linux/x64/
-Wno-sign-compare -Wno-unused-function
-I/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/media/libvpx/libvpx
-I/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/media/libvpx/config
/new-hd1/extra/ishikawa/TB-3HG/NEW-COMMSRC/mozilla/media/libvpx/libvpx/vp9/decoder/vp9_dsubexp.c

I am going to upload the preprocessed file.