[Bug target/66483] New: [4.9 Regression] ICE (in add_stores, at var-tracking.c:6000) on arm-linux-gnueabihf

["doko at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66483

            Bug ID: 66483
           Summary: [4.9 Regression] ICE (in add_stores, at
                    var-tracking.c:6000) on arm-linux-gnueabihf
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org
  Target Milestone: ---

Created attachment 35737
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35737&action=edit
reduced file

seen with the 4.9 branch on arm-linux-gnueabihf. lowering optimization to -O1
or omitting -g works around the issue. works with the 4.8 branch and the trunk.

$ g++ -c -std=c++11 -g -O2 -fPIC -fstack-protector-strong -ffunction-sections
-fno-exceptions -frandom-seed=0 qxml.ii 
qxml.ii: In member function 'bool
QXmlSimpleReaderPrivate::isExpandedEntityValueTooLarge(QString*)':
qxml.ii:268:1: internal compiler error: in add_stores, at var-tracking.c:6000
 }
 ^
Please submit a full bug report,
with preprocessed source if appropriate.

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.9/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-20'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm
--disable-libquadmath --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-4.9-armhf/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-armhf
--with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-sjlj-exceptions
--with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb
--enable-checking=release --build=arm-linux-gnueabihf
--host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
Thread model: posix
gcc version 4.9.2 (Debian 4.9.2-20)