[LU-18127] -Werror=array-bounds caused false failure in configure tests

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Affects Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Jian Yu
• Reporter: Jian Yu

Description

While building Lustre codes with kernel 5.19.0-45-generic, I found some configure test results were incorrect because "-Werror=array-bounds" caused false failure in those tests. For example:

build/conftest.c: In function 'main':
build/conftest.c:228:39: error: array subscript 0 is outside array bounds of 'struct inode_operations[0]' [-Werror=array-bounds]
  228 |         ((struct inode_operations *)1)->get_acl((struct inode *)NULL, 0, false);
      |                                       ^~
cc1: all warnings being treated as errors

"-Warray-bounds" was enabled in kernel commit v5.17-rc3-1-ge6148767825c (Makefile: Enable -Warray-bounds), and was disabled in kernel commits:

• v5.19-rc1-28-gf0be87c42cbd (gcc-12: disable '-Warray-bounds' universally for now)
• v6.2-rc3-9-g5a41237ad1d4 (gcc: disable -Warray-bounds for gcc-11 too)
• v6.3-rc7-202-g0da6e5fd6c37 (gcc: disable '-Warray-bounds' for gcc-13 too)