Makefile.inc: Decrease minimal pagesize from 4 kB to 1 kB

commit ac23f9da757e8e47a6bdcfd619c54e9b4c2b906c upstream.

GCC 12 incorrectly warns about an array out of bounds issue:

```
$ make V=1 # emulation/qemu-i440fx
[…]
    CC         ramstage/arch/x86/ebda.o
x86_64-linux-gnu-gcc-12 -MMD -Isrc -Isrc/include -Isrc/commonlib/include -Isrc/commonlib/bsd/include -Ibuild -I3rdparty/vboot/firmware/include -include src/include/kconfig.h -include src/include/rules.h -include src/commonlib/bsd/include/commonlib/bsd/compiler.h -I3rdparty -D__BUILD_DIR__=\"build\" -Isrc/arch/x86/include -D__ARCH_x86_32__ -pipe -g -nostdinc -std=gnu11 -nostdlib -Wall -Wundef -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wno-trigraphs -Wimplicit-fallthrough -Wshadow -Wdate-time -Wtype-limits -Wvla -Wdangling-else -fno-common -ffreestanding -fno-builtin -fomit-frame-pointer -fstrict-aliasing -ffunction-sections -fdata-sections -fno-pie -Wno-packed-not-aligned -fconserve-stack -Wnull-dereference -Wreturn-type -Wlogical-op -Wduplicated-cond -Wno-unused-but-set-variable -Werror -Os -Wno-address-of-packed-member -m32 -Wl,-b,elf32-i386 -Wl,-melf_i386 -m32  -fuse-ld=bfd -fno-stack-protector -Wl,--build-id=none -fno-delete-null-pointer-checks -Wlogical-op -march=i686 -mno-mmx -MT build/ramstage/arch/x86/ebda.o -D__RAMSTAGE__ -c -o build/ramstage/arch/x86/ebda.o src/arch/x86/ebda.c
In file included from src/arch/x86/ebda.c:6:
In function 'write_ble8',
    inlined from 'write_le8' at src/commonlib/include/commonlib/endian.h:155:2,
    inlined from 'write_le16' at src/commonlib/include/commonlib/endian.h:178:2,
    inlined from 'setup_ebda' at src/arch/x86/ebda.c:35:2,
    inlined from 'setup_default_ebda' at src/arch/x86/ebda.c:48:2:
src/commonlib/include/commonlib/endian.h:27:26: error: array subscript 0 is outside array bounds of 'void[0]' [-Werror=array-bounds]
   27 |         *(uint8_t *)dest = val;
      |         ~~~~~~~~~~~~~~~~~^~~~~
[…]
```

[In GCC 12 the new parameter `min-pagesize` is added and defaults 4 kB.][1]
It treats INTEGER_CST addresses smaller than that as assumed results of
pointer arithmetics from NULL while addresses equal or larger than that
as expected user constant addresses. For GCC 13 we can represent results
from pointer arithmetics on NULL using &MEM[(void*)0 + offset] instead
of (void*)offset INTEGER_CSTs.

[1]: https://web.archive.org/web/20220711061810/https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578

TEST=No compile error with gcc (Debian 12.2.0-3) 12.2.0
Original-Change-Id: I6e36633f42cb4dc5af53212c10c919a86e451ee0
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Original-Reviewed-on: https://review.coreboot.org/c/coreboot/+/62830
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>

Change-Id: I90dc714f1959e94e9dc53cd383db19dc0dd9ac37
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70463
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile
index e35904fde1dc..ffb089ab7d54 100755
--- a/util/xcompile/xcompile
+++ b/util/xcompile/xcompile
@@ -192,6 +192,8 @@ detect_special_flags() {
 
 	testcc "$GCC"      "$CFLAGS_GCC -Wno-address-of-packed-member $FLAGS_GCC" &&
 		CFLAGS_GCC="$CFLAGS_GCC -Wno-address-of-packed-member"
+	testcc "$GCC"      "$CFLAGS_GCC --param=min-pagesize=1024 $FLAGS_GCC" &&
+		CFLAGS_GCC="$CFLAGS_GCC --param=min-pagesize=1024"
 	case "$architecture" in
 	x86)
 		;;