https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101553
Bug ID: 101553
Summary: [12 Regression] armhf builds broken on
-Werror=array-bounds
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: tnfchris at gcc dot gnu.org
CC: msebor at gcc dot gnu.org
Target Milestone: ---
Target: arm-none-linux-gnueabihf
All builds (cross and native) of arm-none-linux-gnueabihf are currently broken
and have been for a while now.
I believe it's g:a110855667782dac7b674d3e328b253b3b3c919b but haven't been able
to easily confirm as that patch can no longer be easily reverted.
Failure is in libatomic build:
hecking for suffix of object files... In file included from
gcc/libatomic/config/arm/host-config.h:4,
from gcc/libatomic/libatomic_i.h:232,
from gcc/libatomic/gexch.c:25:
gcc/libatomic/gexch.c: In function ‘libat_exchange’:
gcc/libatomic/config/linux/arm/host-config.h:42:34: error: array subscript 0
is outside array bounds of ‘unsigned int[0]’ [-Werror=array-bounds]
42 | #define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
gcc/libatomic/config/linux/arm/host-config.h:104:26: note: in expansion of
macro ‘__kernel_helper_version’
104 | # define IFUNC_COND_2 (__kernel_helper_version >= 5)
| ^~~~~~~~~~~~~~~~~~~~~~~
gcc/libatomic/config/linux/arm/host-config.h:169:57: note: in expansion of
macro ‘IFUNC_COND_2’
169 | # define MAYBE_HAVE_ATOMIC_CAS_8 (IFUNC_COND_1 | IFUNC_COND_2)
| ^~~~~~~~~~~~
gcc/libatomic/libatomic_i.h:40:25: note: in expansion of macro
‘MAYBE_HAVE_ATOMIC_CAS_8’
40 | #define C2_(X,Y) X ## Y
| ^
gcc/libatomic/libatomic_i.h:41:25: note: in expansion of macro ‘C2_’
41 | #define C2(X,Y) C2_(X,Y)
| ^~~
gcc/libatomic/gexch.c:58:10: note: in expansion of macro ‘C2’
58 | if (!C2(MAYBE_HAVE_ATOMIC_CAS_,N)) break; \
| ^~
gcc/libatomic/gexch.c:120:25: note: in expansion of macro ‘LARGER’
120 | case 5 ... 7: L8: LARGER(8); /* FALLTHRU */
| ^~~~~~
