[Bug bootstrap/51068] New: 4.7 Regression] ARM bootstrap failure due to ICE in rtl_verify_flow_info_1 at cfgrtl.c:2001

[michael.hope at linaro dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51068

             Bug #: 51068
           Summary: 4.7 Regression] ARM bootstrap failure due to ICE in
                    rtl_verify_flow_info_1 at cfgrtl.c:2001
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: michael.hope@linaro.org


trunk r181189 fails during stage1-target-libstdc++-v3 with the following error:

libtool: compile: 
"/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/build/./gcc/xgcc"
-shared-libgcc
"-B/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/build/./gcc"
-nostdinc++
"-L/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/build/armv7l-unknown-linux-gnueabi/libstdc++-v3/src"
"-L/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/build/armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs"
"-B/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/"
"-B/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/install/armv7l-unknown-linux-gnueabi/lib/"
-isystem
"/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/install/armv7l-unknown-linux-gnueabi/include"
-isystem
"/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/install/armv7l-unknown-linux-gnueabi/sys-include"
"-I/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/gcc-4.7~/libstdc++-v3/../libgcc"
"-I/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/build/armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi"
"-I/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/default/build/armv7l-unknown-linux-gnueabi/libstdc++-v3/include"
"-I/scratch/cbuild/slave/slaves/tcpanda01/gcc-4.7~svn181189/gcc/gcc-4.7~/libstdc++-v3/libsupc++"
-fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual
-fdiagnostics-show-location=once -ffunction-sections -fdata-sections
-frandom-seed=new_opvnt.lo -g -O2 -D_GNU_SOURCE -c
"../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opvnt.cc"  -fPIC -DPIC -o
new_opvnt.o

../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc: In function 'void*
operator new [](std::size_t)':
../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc:34:1: error: missing
REG_EH_REGION note in the end of bb 2
../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc:34:1: error: call
edges for non-call insn in bb 2
../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc:34:1: error: in basic
block 2:
../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc:34:1: error: flow
control insn inside a basic block
(call_insn 7 3 63 2 (parallel [
            (set (reg:SI 0 r0)
                (call (mem:SI (symbol_ref:SI ("_Znwj") [flags 0x41]
<function_decl 0x2ae54280 operator new>) [0 operator new S4 A32])
                    (const_int 0 [0])))
            (use (const_int 0 [0]))
            (clobber (reg:SI 14 lr))
        ]) ../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc:33 248
{*call_value_symbol}
     (expr_list:REG_EH_REGION (const_int 1 [0x1])
        (nil))
    (expr_list:REG_CFA_WINDOW_SAVE (use (reg:SI 0 r0))
        (nil)))
../../../../../gcc-4.7~/libstdc++-v3/libsupc++/new_opv.cc:34:1: internal
compiler error: in rtl_verify_flow_info_1, at cfgrtl.c:2001

This happens on ARM in an ARMv5 configuration and Cortex-A9 configuration.

The full build log is here:

http://builds.linaro.org/toolchain/gcc-4.7~svn181189/logs/armv7l-natty-cbuild205-tcpanda01-cortexa9r1/gcc-build.txt

The Cortex-A9 configure flags are:

--prefix=/scratch/cbuild/slave/slaves/tcpanda04/gcc-4.7~svn180460/gcc/default/install
--enable-languages=c,c++,objc,obj-c++,fortran,lto --with-mode=thumb
--with-arch=armv7-a --with-tune=cortex-a9 --with-float=softfp --with-fpu=neon

More information about the host is here:

http://builds.linaro.org/toolchain/gcc-4.7~svn181189/logs/armv7l-natty-cbuild205-tcpanda01-cortexa9r1/host.txt

r181070 was OK so the problem has occurred since then.