[Letux-kernel] v5.9-rc1 compile issue

[David Shah]

The full command I ran was a gcc command I observed make running; with -H added
and the source file replaced by include/linux/ratelimit_types.h (very long!):

 arm-none-linux-gnueabihf-gcc -H -Wp,-MMD,fs/.dcache.o.d -nostdinc -isystem
/home/david/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-
gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/9.2.1/include
-I./arch/arm/include -I./arch/arm/include/generated  -I./include
-I./arch/arm/include/uapi -I./arch/arm/include/generated/uapi -I./include/uapi
-I./include/generated/uapi -include ./include/linux/kconfig.h -include
./include/linux/compiler_types.h -D__KERNEL__ -mlittle-endian -Wall -Wundef
-Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common
-fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-
int -Wno-format-security -std=gnu89 -fno-dwarf2-cfi-asm -fno-ipa-sra
-mabi=aapcs-linux -mfpu=vfp -funwind-tables -marm -Wa,-mno-warn-deprecated
-D__LINUX_ARM_ARCH__=6 -march=armv6k -mtune=arm1136j-s -msoft-float -Uarm -fno-
delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-
format-overflow -Wno-address-of-packed-member -O2 --param=allow-store-data-
races=0 -Wframe-larger-than=1024 -fstack-protector-strong -Wno-unused-but-set-
variable -Wimplicit-fallthrough -Wno-unused-const-variable -fomit-frame-pointer
-fno-var-tracking-assignments -gsplit-dwarf -gdwarf-4 -Wdeclaration-after-
statement -Wvla -Wno-pointer-sign -Wno-stringop-truncation -Wno-array-bounds
-Wno-stringop-overflow -Wno-restrict -Wno-maybe-uninitialized -fno-strict-
overflow -fno-merge-all-constants -fmerge-constants -fno-stack-check -fconserve-
stack -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-
init -fmacro-prefix-map=./= -Wno-packed-not-aligned -fplugin=./scripts/gcc-
plugins/arm_ssp_per_task_plugin.so -fplugin-arg-arm_ssp_per_task_plugin-tso=1
-fplugin-arg-arm_ssp_per_task_plugin-offset=24    -DKBUILD_MODFILE='"fs/dcache"' 
-DKBUILD_BASENAME='"dcache"' -DKBUILD_MODNAME='"dcache"' -c
include/linux/ratelimit_types.h

To avoid seeing the compile errors mixed in with the output, running with "-M
-H" will run the preprocessor only.

Best

David

On Tue, 2020-08-18 at 09:11 +0200, H. Nikolaus Schaller wrote:
> > Am 17.08.2020 um 23:24 schrieb David Shah <dave at ds0.me>:
> > 
> > I'm pretty sure these are supposed to come from include/linux/types.h (via
> > the
> > files this includes)
> 
> Well it only includes uapi/linux/types.h
> 
> > in this context.
> > 
> > Running gcc -H
> 
> thats nice. I didn't know about this gcc option after using it for 20 years...
> 
> > on the problematic header (on upstream 5.9) gets the following
> > include graph:
> > 
> > . ./include/linux/bits.h
> > .. ./include/linux/const.h
> > ... ./include/vdso/const.h
> > .... ./include/uapi/linux/const.h
> > .. ./include/vdso/bits.h
> > .. ./arch/arm/include/generated/uapi/asm/bitsperlong.h
> > ... ./include/asm-generic/bitsperlong.h
> > .... ./include/uapi/asm-generic/bitsperlong.h
> > .. ./include/linux/build_bug.h
> > ... ./include/linux/compiler.h
> > .... ./include/linux/compiler_types.h
> > .... ./arch/arm/include/generated/asm/rwonce.h
> > ..... ./include/asm-generic/rwonce.h
> > ...... ./include/linux/kasan-checks.h
> > ....... ./include/linux/types.h
> > ........ ./include/uapi/linux/types.h
> > ......... ./arch/arm/include/uapi/asm/types.h
> > .......... ./include/asm-generic/int-ll64.h
> > ........... ./include/uapi/asm-generic/int-ll64.h
> > ............ ./arch/arm/include/generated/uapi/asm/bitsperlong.h
> > ......... ./include/uapi/linux/posix_types.h
> > .......... ./include/linux/stddef.h
> > ........... ./include/uapi/linux/stddef.h
> > .......... ./arch/arm/include/uapi/asm/posix_types.h
> > ........... ./include/uapi/asm-generic/posix_types.h
> > ............ ./arch/arm/include/generated/uapi/asm/bitsperlong.h
> > ...... ./include/linux/kcsan-checks.h
> > . ./include/uapi/linux/param.h
> > .. ./arch/arm/include/generated/uapi/asm/param.h
> > ... ./include/asm-generic/param.h
> > .... ./include/uapi/asm-generic/param.h
> > . ./include/linux/spinlock_types.h
> > .. ./arch/arm/include/asm/spinlock_types.h
> > .. ./include/linux/lockdep_types.h
> > .. ./include/linux/rwlock_types.h
> 
> I can't reproduce your output. include paths are missing and there are more
> compile errors than include file hints.
> How does your gcc -H command look like?
> 
> > The path here to ./include/linux/types.h does indeed look a bit convoluted
> > (but
> > the build works, as expected). Hopefully this helps find the discrepancy
> > with
> > Letux.
> 
> What I have also observed in the past months is that compiler dependencies are
> increasing...
> 
> BR and thanks,
> Nikolaus
>