[Bug c/38460] New: fails to build unwinder

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

compiling gcc/unwind* with IMA fails to produce correct assembly with trunk:

/there/src/buildroot.git.pentium4/i686_build/staging/usr/bin/i686-linux-uclibc-gcc
 -Os -pipe -fno-builtin -O2  -Os -pipe -fno-builtin   -DIN_GCC   -W -Wall
-Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual
-Wold-style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT
-DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED   -I. -I. -I../.././gcc
-I/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc
-I/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/.
-I/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc
-I/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../include 
-DHAVE_CC_TLS -DUSE_TLS -o libgcc_eh_onestep.o -MT libgcc_eh_onestep.o -MD -MP
-MF libgcc_eh_onestep.dep -fexceptions
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/emutls.c
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/gthr-gnat.c
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-c.c
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde-glibc.c
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2.c
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-sjlj.c
-fvisibility=hidden -DHIDE_EXPORTS -c -combine
In file included from
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde-glibc.c:62:
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:
In function ?fde_unencoded_compare?:
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:326:
warning: dereferencing type-punned pointer will break strict-aliasing rules
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:327:
warning: dereferencing type-punned pointer will break strict-aliasing rules
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:
In function ?add_fdes?:
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:682:
warning: dereferencing type-punned pointer will break strict-aliasing rules
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:
In function ?linear_search_fdes?:
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:800:
warning: dereferencing type-punned pointer will break strict-aliasing rules
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:
In function ?binary_search_unencoded_fdes?:
/there/src/buildroot.git.pentium4/i686_toolchain/gcc-4.4.0/libgcc/../gcc/unwind-dw2-fde.c:848:
warning: dereferencing type-punned pointer will break strict-aliasing rules
{standard input}: Assembler messages:
{standard input}:4640: Error: symbol `read_encoded_value' is already defined
make[3]: *** [libgcc_eh_onestep.o] Error 1


-- 
           Summary: fails to build unwinder
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: assemble-failure
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: aldot at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38460