[Bug binutils/19788] New: gcc 6.0, bfd/aoutx.h and -Werror=strict-aliasing

[dilyan.palauzov at aegee dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19788

            Bug ID: 19788
           Summary: gcc 6.0, bfd/aoutx.h and -Werror=strict-aliasing
           Product: binutils
           Version: 2.27 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: dilyan.palauzov at aegee dot org
  Target Milestone: ---

Compiling bfd with gcc 6.0.0 20160308 prints:

make[4]: Entering directory '/binutils/bfd'
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.
-I/git/binutils-gdb/bfd -I. -I/git/binutils-gdb/bfd
-I/git/binutils-gdb/bfd/../include  -DHAVE_x86_64_elf64_vec
-DHAVE_i386_elf32_vec -DHAVE_iamcu_elf32_vec -DHAVE_x86_64_elf32_vec
-DHAVE_i386_aout_linux_vec -DHAVE_i386_pei_vec -DHAVE_x86_64_pei_vec
-DHAVE_l1om_elf64_vec -DHAVE_k1om_elf64_vec -DHAVE_elf64_le_vec
-DHAVE_elf64_be_vec -DHAVE_elf32_le_vec -DHAVE_elf32_be_vec -DHAVE_plugin_vec 
-DBINDIR='"/usr/local/bin"'  -W -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wshadow -Werror  -pipe -O3 -fno-fat-lto-objects -flto -MT aout32.lo -MD -MP
-MF .deps/aout32.Tpo -c -o aout32.lo /git/binutils-gdb/bfd/aout32.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/git/binutils-gdb/bfd -I.
-I/git/binutils-gdb/bfd -I/git/binutils-gdb/bfd/../include
-DHAVE_x86_64_elf64_vec -DHAVE_i386_elf32_vec -DHAVE_iamcu_elf32_vec
-DHAVE_x86_64_elf32_vec -DHAVE_i386_aout_linux_vec -DHAVE_i386_pei_vec
-DHAVE_x86_64_pei_vec -DHAVE_l1om_elf64_vec -DHAVE_k1om_elf64_vec
-DHAVE_elf64_le_vec -DHAVE_elf64_be_vec -DHAVE_elf32_le_vec -DHAVE_elf32_be_vec
-DHAVE_plugin_vec -DBINDIR=\"/usr/local/bin\" -W -Wall -Wstrict-prototypes
-Wmissing-prototypes -Wshadow -Werror -pipe -O3 -fno-fat-lto-objects -flto -MT
aout32.lo -MD -MP -MF .deps/aout32.Tpo -c /git/binutils-gdb/bfd/aout32.c -o
aout32.o
In file included from /git/binutils-gdb/bfd/aout32.c:24:0:
/git/binutils-gdb/bfd/aoutx.h: In function 'aout_32_write_syms':
/git/binutils-gdb/bfd/aoutx.h:1871:4: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
    H_PUT_16 (abfd, aout_symbol (g)->desc,  nsp.e_desc);
    ^~~~~~~~
/git/binutils-gdb/bfd/aoutx.h:1872:4: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
    H_PUT_8  (abfd, aout_symbol (g)->other, nsp.e_other);
    ^~~~~~~
/git/binutils-gdb/bfd/aoutx.h:1873:4: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
    H_PUT_8  (abfd, aout_symbol (g)->type,  nsp.e_type);
    ^~~~~~~
/git/binutils-gdb/bfd/aoutx.h: In function 'aout_32_get_symbol_info':
/git/binutils-gdb/bfd/aoutx.h:2504:7: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
       int type_code = aout_symbol (symbol)->type & 0xff;
       ^~~
/git/binutils-gdb/bfd/aoutx.h:2515:7: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
       ret->stab_other = (unsigned) (aout_symbol (symbol)->other & 0xff);
       ^~~
/git/binutils-gdb/bfd/aoutx.h:2516:7: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
       ret->stab_desc = (unsigned) (aout_symbol (symbol)->desc & 0xffff);
       ^~~
/git/binutils-gdb/bfd/aoutx.h: In function 'aout_32_print_symbol':
/git/binutils-gdb/bfd/aoutx.h:2537:9: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
         (unsigned) (aout_symbol (symbol)->desc & 0xffff),
         ^
/git/binutils-gdb/bfd/aoutx.h:2538:9: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
         (unsigned) (aout_symbol (symbol)->other & 0xff),
         ^
/git/binutils-gdb/bfd/aoutx.h:2539:9: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
         (unsigned) (aout_symbol (symbol)->type));
         ^
/git/binutils-gdb/bfd/aoutx.h:2549:4: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
    (unsigned) (aout_symbol (symbol)->desc & 0xffff),
    ^
/git/binutils-gdb/bfd/aoutx.h:2550:4: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
    (unsigned) (aout_symbol (symbol)->other & 0xff),
    ^
/git/binutils-gdb/bfd/aoutx.h:2551:4: error: dereferencing type-punned pointer
will break strict-aliasing rules [-Werror=strict-aliasing]
    (unsigned) (aout_symbol (symbol)->type & 0xff));
    ^
cc1: all warnings being treated as errors
Makefile:1640: recipe for target 'aout32.lo' failed
make[4]: *** [aout32.lo] Error 1
make[4]: Leaving directory '/binutils/bfd'

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