[Bug general/29614] Fails to build with GCC master + -D_FORTIFY_SOURCE=3

["mliska at suse dot cz" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29614

--- Comment #5 from Martin Liska <mliska at suse dot cz> ---
Am using the current master of both GCC and Glibc library:

[   96s] gcc -D_GNU_SOURCE -DHAVE_CONFIG_H -DLOCALEDIR='"/usr/share/locale"'
-I. -I..  -I. -I. -I../lib -I.. -I. -I./../libelf -I./../libebl -I./../libdw
-I./../libdwelf -I./../debuginfod  -std=gnu99 -Wall -Wshadow -Wformat=2
-Wold-style-definition -Wstrict-prototypes -Wtrampolines -Wlogical-op
-Wduplicated-cond -Wnull-dereference -Wimplicit-fallthrough=5 -Werror -Wunused
-Wextra -Wstack-usage=262144   -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
-fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables
-fstack-clash-protection -Werror=return-type -flto=auto -ffat-lto-objects -g -g
-c -o core-file.o core-file.c
[   96s] In file included from /usr/include/ar.h:22,
[   96s]                  from ../libelf/libelfP.h:33,
[   96s]                  from core-file.c:31:
[   96s] In function 'pread',
[   96s]     inlined from 'pread_retry' at ../lib/system.h:188:21,
[   96s]     inlined from 'elf_begin_rand' at core-file.c:86:16,
[   96s]     inlined from 'core_file_read_eagerly' at core-file.c:205:15:
[   96s] /usr/include/bits/unistd.h:74:10: error: '*pread' writing 58 or more
bytes into a region of size 10 overflows the destination
[-Werror=stringop-overflow=]
[   96s]    74 |   return __glibc_fortify (pread, __nbytes, sizeof (char),
[   96s]       |          ^~~~~~~~~~~~~~~
[   96s] /usr/include/ar.h: In function 'core_file_read_eagerly':
[   96s] /usr/include/ar.h:41:10: note: destination object 'ar_size' of size 10
[   96s]    41 |     char ar_size[10];           /* File size, in ASCII
decimal.  */
[   96s]       |          ^~~~~~~
[   96s] /usr/include/bits/unistd.h:50:16: note: in a call to function '*pread'
declared with attribute 'access (write_only, 2, 3)'
[   96s]    50 | extern ssize_t __REDIRECT (__pread_alias,
[   96s]       |                ^~~~~~~~~~
[   96s] cc1: all warnings being treated as errors
[   96s] make[2]: *** [Makefile:711: core-file.o] Error 1
[   96s] make[2]: *** Waiting for unfinished jobs....

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