[Bug c++/54126] New: ICE on constexpr move ctor with const ref type instead of error

["morpheby at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54126

             Bug #: 54126
           Summary: ICE on constexpr move ctor with const ref type instead
                    of error
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: morpheby@gmail.com


Compiling attached source fails with ICE:
$ gcc -std=c++11 gcc-bug.cpp --save-temps
gcc-bug.cpp: In instantiation of 'constexpr ClassA<T1>::ClassA(U1&&) [with U1 =
int; T1 = const ClassB&]':
gcc-bug.cpp:34:3:   required from here
gcc-bug.cpp:22:12: internal compiler error: in
build_data_member_initialization,
 at cp/semantics.c:5790

GCC version dump: $ gcc -v
Using built-in specs.
COLLECT_GCC=C:\MinGW\bin\gcc.exe
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/i686-w64-mingw32/4.7.2/lto-wrapp
er.exe
Target: i686-w64-mingw32
Configured with: ../..//mingw-src/gcc-4_7-branch/configure
--host=i686-w64-mingw
32 --build=i686-w64-mingw32 --target=i686-w64-mingw32
--prefix=/mingw-gcc-4_7-br
anch-x32 --with-sysroot=/mingw-gcc-4_7-branch-x32 --enable-shared
--enable-stati
c --enable-targets=all --enable-multilib --enable-languages=c,c++,fortran,lto
--
enable-libstdcxx-time=yes --enable-threads=posix --enable-libgomp --enable-lto
-
-enable-graphite --enable-cloog-backend=isl --enable-checking=release
--enable-f
ully-dynamic-string --enable-version-specific-runtime-libs
--enable-sjlj-excepti
ons --disable-ppl-version-check --disable-cloog-version-check
--disable-libstdcx
x-pch --disable-libstdcxx-debug --disable-bootstrap --disable-rpath
--disable-wi
n32-registry --disable-nls --disable-werror --disable-symvers --with-gnu-ld
--wi
th-tune=generic --with-host-libstdcxx='-static -lstdc++' --with-libiconv
--with-
gmp=/mingw-gcc-4_7-branch-libs-x32 --with-mpfr=/mingw-gcc-4_7-branch-libs-x32
--
with-mpc=/mingw-gcc-4_7-branch-libs-x32
--with-ppl=/mingw-gcc-4_7-branch-libs-x3
2 --with-cloog=/mingw-gcc-4_7-branch-libs-x32 --with-pkgversion='MinGW-builds:
h
ttp://sourceforge.net/projects/mingwbuilds/'
--with-bugurl=http://sourceforge.ne
t/projects/mingwbuilds/ CFLAGS='-O2 -pipe -fomit-frame-pointer
-momit-leaf-frame
-pointer -I/mingw-gcc-4_7-branch-libs-x32/include' CXXFLAGS='-O2 -pipe
-fomit-fr
ame-pointer -momit-leaf-frame-pointer' CPPFLAGS= LDFLAGS='-pipe -s
-L/mingw-gcc-
4_7-branch-libs-x32/lib -L/mingw-gcc-4_7-branch-x32/bin'
Thread model: posix
gcc version 4.7.2 20120727 (prerelease) (MinGW-builds:
http://sourceforge.net/pr
ojects/mingwbuilds/)