https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92815
Arseny Solokha <asolokha at gmx dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |asolokha at gmx dot com
--- Comment #9 from Arseny Solokha <asolokha at gmx dot com> ---
Created attachment 48593
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48593&action=edit
Diff between assembler output produced by gcc and g++ 11
Though there are no flexible array members in C++, is it expected for g++ to
behave differently w/ this testcase?
While compiling it w/ gcc yeilds the following, which is expected:
% gcc-11.0.0 -c gcc/testsuite/gcc.dg/builtin-object-size-21.c
gcc/testsuite/gcc.dg/builtin-object-size-21.c:29:14: error: size of variable
'xm3_4' is too large
29 | struct Ax_m3 xm3_4 = { { 0 }, { 1, 2, 3, 3 } }; // { dg-error "too
large" }
| ^~~~~
gcc/testsuite/gcc.dg/builtin-object-size-21.c:43:14: error: size of variable
'xmx_1' is too large
43 | struct Ax_mx xmx_1 = { { 0 }, { 1 } }; // { dg-error "too
large" }
|
W/ g++ I have
% g++-11.0.0 -c gcc/testsuite/gcc.dg/builtin-object-size-21.c
/tmp/ccPBumhF.s: Assembler messages:
/tmp/ccPBumhF.s: Fatal error: can't write 14 bytes to section .text of
/tmp/ccj6lymE.o: 'file truncated'
/usr/lib/gcc/x86_64-unknown-linux-gnu/11.0.0/../../../../x86_64-unknown-linux-gnu/bin/as:
BFD (Gentoo 2.34 p4) 2.34.0 assertion fail
/var/tmp/portage/sys-devel/binutils-2.34-r1/work/binutils-2.34/bfd/elf.c:3169
/tmp/ccPBumhF.s: Fatal error: can't close /tmp/ccj6lymE.o: file truncated
because of
[pid 1165642] openat(AT_FDCWD, "builtin-object-size-21.o",
O_RDWR|O_CREAT|O_TRUNC, 0666) = 3
<…>
[pid 1165642] fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
[pid 1165642] lseek(3, -9223372036854775808, SEEK_SET) = -1 EINVAL (Invalid
argument)
Or, when writing to an "endless" file w/ -o /dev/null:
[pid 1164514] lseek(3, -9223372036854775808, SEEK_SET) = 0
[pid 1164514] read(3, "", 640) = 0
[pid 1164514] lseek(3, 640, SEEK_CUR) = 0
[pid 1164514] write(3, "\0builtin-object-size-21.c\0xm3_0\0"..., 96) = 96
[pid 1164514] lseek(3, 0, SEEK_SET) = 0
[pid 1164514] read(3, "", 4096) = 0
[pid 1164514] lseek(3, 64, SEEK_CUR) = 0
[pid 1164514] write(3, "UH\211\345\220]\303UH\211\345\220]\303", 14) = 14
[pid 1164514] lseek(3, 0, SEEK_SET) = 0
[pid 1164514] read(3, "", 4096) = 0
[pid 1164514] lseek(3, 96, SEEK_CUR) = 0
[pid 1164514] write(3,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) =
4096
[pid 1164514] write(3,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) =
4096
[pid 1164514] write(3,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) =
4096
