Hi all,
just looking to see if anyone has any suggestions to help me debug an issue I'm
seeing here. Basically, the clang target is no longer working for me on Fedora
20 -due to errors when compiling up the kernel modules. The interesting thing
is that the gcc target works fine, while the clang target doesn't - despite the
fact that gcc is used as the compiler for the kernel modules in both builds.
Something else about the clang target is affecting the kernel compile.
>From my investigation, it looks like the compiler flags used in both cases are
>different, but I'm not sure why. The output of compiling up the first of the
>kni files is shown below, first for a regular gcc target and secondly for the
>clang target. From what I read, some initial support for clang compiler went
>into the 3.15 kernels - is it possible that clang is being incorrectly
>detected as the kernel compiler by the kernel build system in the second case?
Regards,
/Bruce
#### GCC TARGET COMPILE
== Build lib/librte_eal/linuxapp/kni
make -C /usr/src/kernels/3.15.10-201.fc20.x86_64 \
KBUILD_SRC=/usr/src/kernels/3.15.10-201.fc20.x86_64 \
KBUILD_EXTMOD="/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni"
-f /usr/src/kernels/3.15.10-201.fc20.x86_64/Makefile \
test -e include/generated/autoconf.h -a -e include/config/auto.conf || (
\
echo >&2; \
echo >&2 " ERROR: Kernel configuration is invalid."; \
echo >&2 " include/generated/autoconf.h or include/config/auto.conf are
missing.";\
echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix
it."; \
echo >&2 ; \
/bin/false)
mkdir -p
/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni/.tmp_versions
; rm -f
/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni/.tmp_versions/*
make -f /usr/src/kernels/3.15.10-201.fc20.x86_64/scripts/Makefile.build
obj=/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni
gcc
-Wp,-MD,/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni/.ixgbe_main.o.d
-nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/arch/x86/include
-Iarch/x86/include/generated
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/include -Iinclude
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/arch/x86/include/uapi
-Iarch/x86/include/generated/uapi
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/include/uapi
-Iinclude/generated/uapi -include
/usr/src/kernels/3.15.10-201.fc20.x86_64/include/linux/kconfig.h
-I/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni
-D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -Werror-implicit-function-declaration
-Wno-format-security -fno-delete-null-pointer-checks -O2 -m64 -mno-mmx -mno-sse
-mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mtune=generic
-mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args
-DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1
-DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_CRC32=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1
-pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx
-mno-sse2 -mno-3dnow -mno-avx -Wframe-larger-than=2048 -fstack-protector-strong
-Wno-unused-but-set-variable -fno-omit-frame-pointer
-fno-optimize-sibling-calls -fno-var-tracking-assignments -g -pg -mfentry
-DCC_USING_FENTRY -Wdeclaration-after-statement -Wno-pointer-sign
-fno-strict-overflow -fconserve-stack -Werror=implicit-int
-Werror=strict-prototypes -DCC_HAVE_ASM_GOTO
-I/home/bruce/mbuf_rework/lib/librte_eal/linuxapp/kni --param
max-inline-insns-single=50
-I/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/include
-I/home/bruce/mbuf_rework/lib/librte_eal/linuxapp/kni/ethtool/ixgbe
-I/home/bruce/mbuf_rework/lib/librte_eal/linuxapp/kni/ethtool/igb -include
/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/include/rte_config.h -Wall
-Werror -DMODULE -D"KBUILD_STR(s)=#s"
-D"KBUILD_BASENAME=KBUILD_STR(ixgbe_main)"
-D"KBUILD_MODNAME=KBUILD_STR(rte_kni)" -c -o
/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni/ixgbe_main.o
/home/bruce/mbuf_rework/x86_64-native-linuxapp-gcc/build/lib/librte_eal/linuxapp/kni/ixgbe_main.c
#### CLANG TARGET COMPILE (MODULE COMPILED USING GCC)
== Build lib/librte_eal/linuxapp/kni
make -C /usr/src/kernels/3.15.10-201.fc20.x86_64 \
KBUILD_SRC=/usr/src/kernels/3.15.10-201.fc20.x86_64 \
KBUILD_EXTMOD="/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni"
-f /usr/src/kernels/3.15.10-201.fc20.x86_64/Makefile \
test -e include/generated/autoconf.h -a -e include/config/auto.conf || (
\
echo >&2; \
echo >&2 " ERROR: Kernel configuration is invalid."; \
echo >&2 " include/generated/autoconf.h or include/config/auto.conf are
missing.";\
echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix
it."; \
echo >&2 ; \
/bin/false)
mkdir -p
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/.tmp_versions
; rm -f
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/.tmp_versions/*
make -f /usr/src/kernels/3.15.10-201.fc20.x86_64/scripts/Makefile.build
obj=/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni
gcc
-Wp,-MD,/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/.ixgbe_main.o.d
-nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/arch/x86/include
-Iarch/x86/include/generated
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/include -Iinclude
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/arch/x86/include/uapi
-Iarch/x86/include/generated/uapi
-I/usr/src/kernels/3.15.10-201.fc20.x86_64/include/uapi
-Iinclude/generated/uapi -include
/usr/src/kernels/3.15.10-201.fc20.x86_64/include/linux/kconfig.h
-I/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni
-D__KERNEL__ -Wno-unknown-warning-option -Wall -Wundef -Wstrict-prototypes
-Wno-trigraphs -fno-strict-aliasing -fno-common
-Werror-implicit-function-declaration -Wno-format-security
-fno-delete-null-pointer-checks -O2 -m64 -mno-mmx -mno-sse -mno-80387
-mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mtune=generic -mno-red-zone
-mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_AS_CFI=1
-DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_FXSAVEQ=1
-DCONFIG_AS_CRC32=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -pipe
-Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2
-mno-3dnow -mno-avx -Wframe-larger-than=2048 -fstack-protector-strong
-Wno-unused-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls
-fno-var-tracking-assignments -g -pg -mfentry -DCC_USING_FENTRY
-Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow
-fconserve-stack -Werror=implicit-int -Werror=strict-prototypes
-DCC_HAVE_ASM_GOTO -I/home/bruce/mbuf_rework/lib/librte_eal/linuxapp/kni
--param max-inline-insns-single=50
-I/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/include
-I/home/bruce/mbuf_rework/lib/librte_eal/linuxapp/kni/ethtool/ixgbe
-I/home/bruce/mbuf_rework/lib/librte_eal/linuxapp/kni/ethtool/igb -include
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/include/rte_config.h -Wall
-Werror -DMODULE -D"KBUILD_STR(s)=#s"
-D"KBUILD_BASENAME=KBUILD_STR(ixgbe_main)"
-D"KBUILD_MODNAME=KBUILD_STR(rte_kni)" -c -o
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/ixgbe_main.o
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/ixgbe_main.c
In file included from
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/ixgbe_main.c:34:0:
/usr/src/kernels/3.15.10-201.fc20.x86_64/include/linux/netdevice.h: In function
'netif_addr_lock_nested':
/usr/src/kernels/3.15.10-201.fc20.x86_64/include/linux/netdevice.h:2954:6:
error: variable 'subclass' set but not used [-Werror=unused-but-set-variable]
int subclass = SINGLE_DEPTH_NESTING;
^
/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/ixgbe_main.c:
At top level:
cc1: error: unrecognized command line option "-Wno-unknown-warning-option"
[-Werror]
cc1: all warnings being treated as errors
make[10]: ***
[/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni/ixgbe_main.o]
Error 1
make[9]: ***
[_module_/home/bruce/mbuf_rework/x86_64-native-linuxapp-clang/build/lib/librte_eal/linuxapp/kni]
Error 2
make[8]: *** [sub-make] Error 2
make[7]: *** [rte_kni.ko] Error 2
make[6]: *** [kni] Error 2
make[5]: *** [linuxapp] Error 2
make[4]: *** [librte_eal] Error 2
make[3]: *** [lib] Error 2
make[2]: *** [all] Error 2
make[1]: *** [x86_64-native-linuxapp-clang_install] Error 2
make: *** [install] Error 2
