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Hello build bot (Jenkins), Angel Pons,
I'd like you to do a code review. Please visit
https://review.coreboot.org/c/coreboot/+/81785?usp=email
to review the following change.
Change subject: Makefile.inc: Decrease minimal pagesize from 4 kB to 1 kB ......................................................................
Makefile.inc: Decrease minimal pagesize from 4 kB to 1 kB
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...
TEST=No compile error with gcc (Debian 12.2.0-3) 12.2.0 Change-Id: I6e36633f42cb4dc5af53212c10c919a86e451ee0 Signed-off-by: Paul Menzel pmenzel@molgen.mpg.de Reviewed-on: https://review.coreboot.org/c/coreboot/+/62830 Tested-by: build bot (Jenkins) no-reply@coreboot.org Reviewed-by: Angel Pons th3fanbus@gmail.com --- M util/xcompile/xcompile 1 file changed, 2 insertions(+), 1 deletion(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/81785/1
diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile index 2d3da1e..1327324 100755 --- a/util/xcompile/xcompile +++ b/util/xcompile/xcompile @@ -184,7 +184,8 @@ CFLAGS_GCC="$CFLAGS_GCC -fno-stack-protector" testcc "$GCC" "$CFLAGS_GCC -Wl,--build-id=none" && CFLAGS_GCC="$CFLAGS_GCC -Wl,--build-id=none" - + testcc "$GCC" "$CFLAGS_GCC --param=min-pagesize=1024 $FLAGS_GCC" && + CFLAGS_GCC="$CFLAGS_GCC --param=min-pagesize=1024" case "$architecture" in x86) ;;