[dpdk-dev] compile error with linuxapp-clang target on Fedora 20 with 3.15.10 kernel

[Matthew Hall]

I fixed some of the clang errors a few weeks ago. But some of my patches got sent back due to issues seen by others and I didn't have time to fix them yet.
-- 
Sent from my mobile device.

On September 22, 2014 6:18:51 AM PDT, Neil Horman <nhorman at tuxdriver.com> wrote:
>On Mon, Sep 22, 2014 at 09:36:33AM +0000, Richardson, Bruce wrote:
>> 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
>> 
>
>
>FWIW, gcc documents the -Wno-unknown-warning option, not the
>-Wno-unknown-warning-option option, so it seems that, when using the
>clang
>config something about it is slipping in an extra option that gcc is
>choking on,
>though I can