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genprotimg/boot: disable -Warray-bounds for now

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This work around fixes the gcc-12 false positive by disabling `Warray-bounds`:

  CC      genprotimg/boot/stage3a.o
  In file included from stage3a.c:14:
  In function ‘__test_facility’,
      inlined from ‘test_facility’ at ../../include/boot/s390.h:428:9,
      inlined from ‘start’ at stage3a.c:42:7:
  ../../include/boot/s390.h:418:17: error: array subscript 0 is outside array bounds of ‘void[0]’ [-Werror=array-bounds]
    418 |         return (*ptr & (0x80 >> (nr & 7))) != 0;
	|                 ^~~~

Unfortunately, there is currently no better fix available that doesn't result
in larger boot loader code sizes. Given the importancy of the boot loader file
sizes the other fixes aren't acceptable. The Linux kernel shares the
problem (but for performance reasons), take a look at the discussion
https://lore.kernel.org/lkml/yt9dzgkelelc.fsf@linux.ibm.com/ for details.

Fixes: https://github.com/ibm-s390-linux/s390-tools/issues/130
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Marc Hartmayer
2022-04-26 09:22:10 +00:00
committed by Jan Höppner
parent a0dba6bfdb
commit 9e62005818
1 changed files with 2 additions and 1 deletions
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3
genprotimg/boot/Makefile
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@@ -15,7 +15,8 @@ ALL_CFLAGS := $(NO_PIE_CFLAGS) -Os -g \
-fno-delete-null-pointer-checks -fno-stack-protector \
-fexec-charset=IBM1047 -m64 -mpacked-stack \
-mstack-size=4096 -mstack-guard=128 -msoft-float \
-Wall -Wformat-security -Wextra -Werror
-Wall -Wformat-security -Wextra -Werror \
-Wno-array-bounds
FILES := stage3a.bin stage3b.bin stage3b_reloc.bin