[Bug build/26750] New: -Werror=stringop-overflow instances building with GCC 11

[Bug build/26750] New: -Werror=stringop-overflow instances building with GCC 11

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26750

            Bug ID: 26750
           Summary: -Werror=stringop-overflow instances building with GCC
                    11
           Product: glibc
           Version: 2.33
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

On Linux/x86-64, GCC 11 r11-4026 gave

[hjl@gnu-skx-1 csu]$
/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/
../sysdeps/x86/libc-start.c -c -std=gnu11 -fgnu89-inline  -O2 -g -Wall
-Wwrite-strings -Wundef -Werror -fmerge-all-constants -frounding-math
-fno-stack-protector -Wstrict-prototypes -Wold-style-definition -fmath-errno  
-fPIC -fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0 -funwind-tables 
-ftls-model=initial-exec      -I../include
-I/export/users/hjl/build/gnu/tools-build/glibc/build-x86_64-linux/csu 
-I/export/users/hjl/build/gnu/tools-build/glibc/build-x86_64-linux 
-I../sysdeps/unix/sysv/linux/x86_64/64  -I../sysdeps/unix/sysv/linux/x86_64 
-I../sysdeps/unix/sysv/linux/x86/include -I../sysdeps/unix/sysv/linux/x86 
-I../sysdeps/x86/nptl  -I../sysdeps/unix/sysv/linux/wordsize-64 
-I../sysdeps/x86_64/nptl  -I../sysdeps/unix/sysv/linux/include
-I../sysdeps/unix/sysv/linux  -I../sysdeps/nptl  -I../sysdeps/pthread 
-I../sysdeps/gnu  -I../sysdeps/unix/inet  -I../sysdeps/unix/sysv 
-I../sysdeps/unix/x86_64  -I../sysdeps/unix  -I../sysdeps/posix 
-I../sysdeps/x86_64/64  -I../sysdeps/x86_64/fpu/multiarch 
-I../sysdeps/x86_64/fpu  -I../sysdeps/x86/fpu  -I../sysdeps/x86_64/multiarch 
-I../sysdeps/x86_64  -I../sysdeps/x86/include -I../sysdeps/x86 
-I../sysdeps/ieee754/float128  -I../sysdeps/ieee754/ldbl-96/include
-I../sysdeps/ieee754/ldbl-96  -I../sysdeps/ieee754/dbl-64/wordsize-64 
-I../sysdeps/ieee754/dbl-64  -I../sysdeps/ieee754/flt-32 
-I../sysdeps/wordsize-64  -I../sysdeps/ieee754  -I../sysdeps/generic  -I..
-I../libio -I.   -D_LIBC_REENTRANT -include
/export/users/hjl/build/gnu/tools-build/glibc/build-x86_64-linux/libc-modules.h
-DMODULE_NAME=libc -include ../include/libc-symbols.h  -DPIC -DSHARED    
-DTOP_NAMESPACE=glibc -o
/export/users/hjl/build/gnu/tools-build/glibc/build-x86_64-linux/csu/libc-start.os
-MD -MP -MF
/export/users/hjl/build/gnu/tools-build/glibc/build-x86_64-linux/csu/libc-start.os.dt
-MT
/export/users/hjl/build/gnu/tools-build/glibc/build-x86_64-linux/csu/libc-start.os
In file included from ../include/setjmp.h:2,
                 from ../nptl/descr.h:24,
                 from ../sysdeps/x86_64/nptl/tls.h:130,
                 from ../include/link.h:51,
                 from ../include/dlfcn.h:4,
                 from ../sysdeps/generic/ldsodefs.h:32,
                 from ../sysdeps/x86/ldsodefs.h:65,
                 from ../sysdeps/gnu/ldsodefs.h:46,
                 from ../sysdeps/unix/sysv/linux/ldsodefs.h:25,
                 from ../csu/libc-start.c:22,
                 from ../sysdeps/x86/libc-start.c:30:
../csu/libc-start.c: In function ??__libc_start_main??:
../setjmp/setjmp.h:49:25: error: ??_setjmp?? accessing 200 bytes in a region of
size 72 [-Werror=stringop-overflow=]
   49 | #define setjmp(env)     _setjmp (env)
      |                         ^~~~~~~~~~~~~
../csu/libc-start.c:301:20: note: in expansion of macro ??setjmp??
  301 |   not_first_call = setjmp ((struct __jmp_buf_tag *)
unwind_buf.cancel_jmp_buf);
      |                    ^~~~~~
../setjmp/setjmp.h:49:25: note: referencing argument 1 of type ??struct
__jmp_buf_tag *??
   49 | #define setjmp(env)     _setjmp (env)
      |                         ^~~~~~~~~~~~~
../csu/libc-start.c:301:20: note: in expansion of macro ??setjmp??
  301 |   not_first_call = setjmp ((struct __jmp_buf_tag *)
unwind_buf.cancel_jmp_buf);
      |                    ^~~~~~
In file included from <command-line>:
../include/setjmp.h:27:20: note: in a call to function ??_setjmp??
   27 | libc_hidden_proto (_setjmp)
      |                    ^~~~~~~
./../include/libc-symbols.h:541:33: note: in definition of macro
??__hidden_proto??
  541 |   extern thread __typeof (name) name __asm__ (__hidden_asmname
(#internal)) \
      |                                 ^~~~
./../include/libc-symbols.h:624:44: note: in expansion of macro
??hidden_proto??
  624 | # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
      |                                            ^~~~~~~~~~~~
../include/setjmp.h:27:1: note: in expansion of macro ??libc_hidden_proto??
   27 | libc_hidden_proto (_setjmp)
      | ^~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
[hjl@gnu-skx-1 csu]$

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[Bug build/26750] -Werror=stringop-overflow instances building with GCC 11

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26750

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
This is a false positive.

*** This bug has been marked as a duplicate of bug 26647 ***

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