[Bug c/45207] New: The -Os flag generates wrong code for ARM966e-s

[fredrik dot hederstierna at securitas-direct dot com]

We have problems with GCC-4.5.0 and GCC-4.5.1 for ARM when using the "-Os"
optimizer flag. The code crashes due to what seems to be undefined instruction
exception.

If we instead use "-O1" or "-O2" it works fine. Also GCC-4.3.x and GCC-4.4.x
works well.

I also tried to add all excluded -O2 flags when compiling with -Os but this
gave still wrong code.

Our CFLAGS:
-g3 -ggdb3 -gdwarf-2 -mthumb -c -Wall -W -Wextra -Wno-unused-parameter
-mcpu=arm966e-s -Os -mhard-float -mfpu=fpa -ffunction-sections -fdata-sections

I attach build-script for our arm-elf-toolchain built on an intel machine.

Also arm-elf-gdb 7.1 complaints about the elf file when trying to debug:

warning: (Internal error: pc 0x4a42c in read in psymtab, but not in symtab.)

Thanks and Best Regards,
Fredrik Hederstierna


-- 
           Summary: The -Os flag generates wrong code for ARM966e-s
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fredrik dot hederstierna at securitas-direct dot com
GCC target triplet: arm-elf-gcc


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45207