Re: Toybox make root no longer works as expected

Hi Jeff,

On Fri, 2026-05-01 at 12:44 +0900, D. Jeff Dionne wrote:
> On May 1, 2026, at 07:46, John Paul Adrian Glaubitz <[email protected]> wrote:
> 
> > Could you maybe build an updated toolchain for sh2eb which is based on a more recent GCC version?
> 
> The main problem here, I think if it’s a version issue, is there is breakage in the GCC optimiser
> when used against the SH backend.  But it could also be the J-Core instruction set variant of SH2.
> 
> GCC 9.4 is probably what you need, we don’t actually use GCC 11… Rob uses a different work flow
> methodology, with the goal of self contained builds.  Most of us benefit from 'golden compilers'
> on the path, and for J-Core that been GCC 9.4 series because of similar problems.  This choice
> came about after some testing, so it’s what Rich Felker’s musl cross make still does.  The results
> of that build script are used in every day work.

GCC 9.4.0 has the same problem, unfortunately:

glaubitz@node54:/data/home/glaubitz/toybox.good> sh2eb-linux-muslfdpic-cc --version
sh2eb-linux-muslfdpic-cc (GCC) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

glaubitz@node54:/data/home/glaubitz/toybox.good> 


  CC      io_uring/bpf_filter.o
during RTL pass: final
In file included from kernel/nstree.c:8:
kernel/nstree.c: In function '__se_sys_listns':
./include/linux/syscalls.h:261:2: internal compiler error: in change_address_1, at emit-rtl.c:2286
  261 |  }        \
      |  ^
./include/linux/syscalls.h:236:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  236 |  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
      |  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:228:36: note: in expansion of macro 'SYSCALL_DEFINEx'
  228 | #define SYSCALL_DEFINE4(name, ...) SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
      |                                    ^~~~~~~~~~~~~~~
kernel/nstree.c:763:1: note: in expansion of macro 'SYSCALL_DEFINE4'
  763 | SYSCALL_DEFINE4(listns, const struct ns_id_req __user *, req,
      | ^~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
{standard input}: Assembler messages:
{standard input}: Warning: end of file not at end of a line; newline inserted
{standard input}:1547: Error: missing operand
{standard input}:1547: Error: invalid operands for opcode
{standard input}:1004: Error: displacement to undefined symbol .L344 overflows 12-bit field
{standard input}:1042: Error: displacement to undefined symbol .L456 overflows 12-bit field
{standard input}:1049: Error: displacement to undefined symbol .L588 overflows 12-bit field
{standard input}:1056: Error: displacement to undefined symbol .L345 overflows 12-bit field
{standard input}:1068: Error: displacement to undefined symbol .L458 overflows 12-bit field
{standard input}:1085: Error: displacement to undefined symbol .L459 overflows 12-bit field
{standard input}:1095: Error: displacement to undefined symbol .L252 overflows 12-bit field
{standard input}:1107: Error: displacement to undefined symbol .L346 overflows 12-bit field
{standard input}:1116: Error: displacement to undefined symbol .L254 overflows 12-bit field
{standard input}:1119: Error: displacement to undefined symbol .L256 overflows 12-bit field
{standard input}:1159: Error: displacement to undefined symbol .L339 overflows 12-bit field
{standard input}:1322: Error: displacement to undefined symbol .L451 overflows 12-bit field
{standard input}:1335: Error: displacement to undefined symbol .L355 overflows 12-bit field
{standard input}:1379: Error: displacement to undefined symbol .L588 overflows 12-bit field
{standard input}:1436: Error: displacement to undefined symbol .L295 overflows 8-bit field 
{standard input}:1439: Error: displacement to undefined symbol .L466 overflows 8-bit field 
{standard input}:1455: Error: displacement to undefined symbol .L292 overflows 12-bit field
{standard input}:1465: Error: displacement to undefined symbol .L468 overflows 12-bit field
{standard input}:1475: Error: displacement to undefined symbol .L304 overflows 12-bit field
{standard input}:1488: Error: displacement to undefined symbol .L353 overflows 12-bit field
{standard input}:1497: Error: displacement to undefined symbol .L306 overflows 12-bit field
{standard input}:1510: Error: displacement to undefined symbol .L354 overflows 12-bit field
{standard input}:1414: Error: pcrel too far
{standard input}:1417: Error: pcrel too far
{standard input}:1500: Error: pcrel too far
make[3]: *** [scripts/Makefile.build:289: kernel/nstree.o] Error 1
make[3]: *** Waiting for unfinished jobs....
  CC      kernel/utsname_sysctl.o

Might be an idea to try an LRA-enabled GCC [1].

Adrian

> [1] https://github.com/olegendo/gcc/tree/devel/sh-lra

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913