https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101379
Bug ID: 101379
Summary: libatomic build failure on arm after r12-2132
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: clyon at gcc dot gnu.org
Target Milestone: ---
After r12-2132, I've noticed a build failure in libatomic for arm. It can be
reproduced with --target arm-linux-gnueabi (not with arm-eabi):
In file included from
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/config/arm/host-config.h:4,
from
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/libatomic_i.h:232,
from
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/gstore.c:25:
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/gstore.c: In
function 'libat_store':
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/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)
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/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)
| ^~~~~~~~~~~~~~~~~~~~~~~
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/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)
| ^~~~~~~~~~~~
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/libatomic_i.h:40:25:
note: in expansion of macro 'MAYBE_HAVE_ATOMIC_CAS_8'
40 | #define C2_(X,Y) X ## Y
| ^
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/libatomic_i.h:41:25:
note: in expansion of macro 'C2_'
41 | #define C2(X,Y) C2_(X,Y)
| ^~~
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/gstore.c:58:10:
note: in expansion of macro 'C2'
58 | if (!C2(MAYBE_HAVE_ATOMIC_CAS_,N)) break; \
| ^~
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libatomic/gstore.c:95:25:
note: in expansion of macro 'LARGER'
95 | case 5 ... 7: L8: LARGER(8); /* FALLTHRU */
| ^~~~~~
cc1: all warnings being treated as errors
make[4]: *** [Makefile:586: gstore.lo] Error 1
