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Bug 1315750

Summary: FTBFS with gcc-6.0.0-0.15.fc24
Product: [Fedora] Fedora Reporter: Dan Horák <dan>
Component: binutilsAssignee: Nick Clifton <nickc>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 24CC: jakub, nickc
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Hardware: All   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2016-03-17 21:10:47 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 467765    

Description Dan Horák 2016-03-08 14:09:55 UTC 
current binutils fail to build with gcc-6.0.0-0.15.fc24, please see "strict aliasing" warnings/errors in the build.log

koji scratch build - http://koji.fedoraproject.org/koji/taskinfo?taskID=13274927

libtool: compile:  x86_64-redhat-linux-gcc -DHAVE_CONFIG_H -I. -I. -I. -I./../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/bin\" -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Werror -I./../zlib -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -c aout32.c  -fPIC -DPIC -o .libs/aout32.o
In file included from aout32.c:24:0:
aoutx.h: In function 'aout_32_write_syms':
aoutx.h:1877:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    H_PUT_16 (abfd, aout_symbol (g)->desc,  nsp.e_desc);
    ^~~~~~~~
aoutx.h:1878:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    H_PUT_8  (abfd, aout_symbol (g)->other, nsp.e_other);
    ^~~~~~~
aoutx.h:1879:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    H_PUT_8  (abfd, aout_symbol (g)->type,  nsp.e_type);
    ^~~~~~~
aoutx.h: In function 'aout_32_get_symbol_info':
aoutx.h:2510:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
       int type_code = aout_symbol (symbol)->type & 0xff;
       ^~~
aoutx.h:2521:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
       ret->stab_other = (unsigned) (aout_symbol (symbol)->other & 0xff);
       ^~~
aoutx.h:2522:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
       ret->stab_desc = (unsigned) (aout_symbol (symbol)->desc & 0xffff);
       ^~~
aoutx.h: In function 'aout_32_print_symbol':
aoutx.h:2543:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
         (unsigned) (aout_symbol (symbol)->desc & 0xffff),
         ^
aoutx.h:2544:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
         (unsigned) (aout_symbol (symbol)->other & 0xff),
         ^
aoutx.h:2545:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
         (unsigned) (aout_symbol (symbol)->type));
         ^
aoutx.h:2555:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    (unsigned) (aout_symbol (symbol)->desc & 0xffff),
    ^
aoutx.h:2556:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    (unsigned) (aout_symbol (symbol)->other & 0xff),
    ^
aoutx.h:2557:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    (unsigned) (aout_symbol (symbol)->type & 0xff));
    ^
...

and more

See also bug 1315191 (gdb) with the same problem.


Version-Release number of selected component (if applicable):
binutils-2.26-14.fc25
Comment 1 Dan Horák 2016-03-08 14:12:47 UTC 
And before I finished this report, the gdb one got closed with a fix :-)
Comment 2 Dan Horák 2016-03-09 09:26:15 UTC 
very likely https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70143 as it coincides with bug 1315191 (and others)
Comment 3 Dan Horák 2016-03-17 21:10:47 UTC 
no more an issue with gcc-6.0.0-0.16.fc24