Bug#882855: g++-7: internal compiler error: in maybe_undo_parenthesized_ref on for initialization list

[David Cadé <codename_68@hotmail.com>]

Package: g++-7
Version: 7.2.0-16
Followup-For: Bug #882855

Dear Maintainer,

here is some more information. g++-5 doesn't return an internal compiler error, but g++-6 and later are. I've also tested with g++ from the gcc-snapshot package, it returns the same error.

Here is the transcript:

---------
g++-5 -std=c++11 test.cpp 
/tmp/ccPhbMC2.o: In function `s<float>::count()':
test.cpp:(.text._ZN1sIfE5countEv[_ZN1sIfE5countEv]+0xd): undefined reference to `rand()'
collect2: error: ld returned 1 exit status
~ $ g++-6 test.cpp 
test.cpp: In instantiation of ‘f(s<v>)::<lambda(int&)> [with v = float]’:
test.cpp:14:16:   required from ‘struct f(s<v>) [with v = float]::<lambda(int&)>’
test.cpp:20:5:   required from ‘int f(s<v>) [with v = float]’
test.cpp:24:24:   required from here
test.cpp:16:33: internal compiler error: in maybe_undo_parenthesized_ref, at cp/semantics.c:1694
         for(int y = 0, yend = (x); y < yend; ++y)
                                 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-6/README.Bugs> for instructions.
~ $ g++-7 test.cpp 
test.cpp: In instantiation of ‘f(s<v>)::<lambda(int&)> [with v = float]’:
test.cpp:14:16:   required from ‘struct f(s<v>) [with v = float]::<lambda(int&)>’
test.cpp:14:10:   required from ‘int f(s<v>) [with v = float]’
test.cpp:24:24:   required from here
test.cpp:16:24: internal compiler error: in maybe_undo_parenthesized_ref, at cp/semantics.c:1705
         for(int y = 0, yend = (x); y < yend; ++y)
                        ^~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
~ $ /usr/lib/gcc-snapshot/bin/g++ test.cpp
test.cpp: In function 'int f(s<v>)':
test.cpp:22:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
test.cpp: In instantiation of 'int f(s<v>) [with v = float]':
test.cpp:24:24:   required from here
test.cpp:16:24: internal compiler error: in maybe_undo_parenthesized_ref, at cp/semantics.c:1738
         for(int y = 0, yend = (x); y < yend; ++y)
                        ^~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-snapshot/README.Bugs> for instructions.
--------

Hope it helps,

David

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (500, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages g++-7 depends on:
ii  gcc-7            7.2.0-16
ii  gcc-7-base       7.2.0-16
ii  libc6            2.25-2
ii  libgmp10         2:6.1.2+dfsg-1.1
ii  libisl15         0.18-1
ii  libmpc3          1.0.3-2
ii  libmpfr4         3.1.6-1
ii  libstdc++-7-dev  7.2.0-16
ii  zlib1g           1:1.2.8.dfsg-5

g++-7 recommends no packages.

Versions of packages g++-7 suggests:
ii  g++-7-multilib    7.2.0-16
pn  gcc-7-doc         <none>
pn  libstdc++6-7-dbg  <none>

-- no debconf information