Re: Compile FreeBSD kernel with gcc48
On 2012-11-11 10:59, Alie Tan wrote: Anyone have experience compiling FreeBSD kernel with gcc48 I have tried it but no success with this in src.conf C= /usr/local/bin/gcc48 CXX= /usr/local/bin/g++48 CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds -Wno-missing-prototypes NO_WERROR= 1 Last time I tried, I could get it to build with a gcc 4.8 snapshot, but it failed to boot. I did not investigate a great deal, but it looked a lot like some sort of optimization bug. Note that gcc 4.8 is still experimental, so problems like this can be expected. However, with gcc 4.7.1, which is a released version, the kernel did build, and even boot. With that kernel booted, I timed how long a make -j8 buildworld took, compared to booting with kernels compiled by gcc in base (v4.2.1) and clang in base (v3.2), on different optimization settings. The raw results are here: http://www.andric.com/freebsd/perftest/perftest-kernel-2012-09-25b.txt Summary: - Kernels compiled with clang 3.2 at -O2 are ~8% faster in system time than kernels compiled with gcc 4.2.1 at -O2. - Kernels compiled with clang 3.2 at -O2 perform equally to kernels compiled with gcc 4.7 at -O2, there is no significant difference. - Kernels compiled with gcc 4.7 at -O3 have a slight advantage in system time (~3.6%) against kernels compiled with clang 3.2 at -O2. (I did not test a kernel compiled with clang 3.2 at -O3.) Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46, gcc47 or gcc48? As said, I only tested clang 3.2 against gcc 4.2 from base, and gcc 4.7.1 (hand-built, since the version from ports is inexplicably some random snapshot, not a released version). If anybody is extremely interested in more results, they should sponsor some fast hardware, and donate it to the FreeBSD Project. ;-) No idea why since there is no compilation error. It stops at this point: /usr/local/bin/gcc48 -O2 -pipe -O3 -fno-strict-aliasing -pipe -funroll-loops -I/usr/src/lib/libc/include -I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/amd64 -DNLS -D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa -DINET6 -I/usr/obj/usr/src/lib/libc -I/usr/src/lib/libc/resolv -D_ACL_PRIVATE -DPOSIX_MISTAKE -I/usr/src/lib/libc/../../contrib/tzcode/stdtime -I/usr/src/lib/libc/stdtime -I/usr/src/lib/libc/locale -DBROKEN_DES -DPORTMAP -DDES_BUILTIN -I/usr/src/lib/libc/rpc -DYP -DNS_CACHING -DSYMBOL_VERSIONING -std=gnu99 -fstack-protector -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wno-pointer-sign -D__FreeBSD_cc_version=81 -Wno-unused-function -Wno-inline -Wsystem-headers -Wall -Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -c nslexer.c -o nslexer.o In file included from /usr/src/lib/libc/net/nslexer.l:49:0: /usr/src/lib/libc/../../include/nsswitch.h:236:14: warning: redundant redeclaration of '_nsyylineno' [-Wredundant-decls] extern int _nsyylineno; And waited for couple of hours still hanging at that point with gcc48 Regards, Alie T ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Compile FreeBSD kernel with gcc48
On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan a...@affle.com wrote: Hi, Anyone have experience compiling FreeBSD kernel with gcc48 I have tried it but no success with this in src.conf C= /usr/local/bin/gcc48 CXX= /usr/local/bin/g++48 CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds -Wno-missing-prototypes NO_WERROR= 1 Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46, gcc47 or gcc48? Uh, probably won't work because of FreeBSD modifications to gcc not being present in upstream IIRC... -Garrett ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Compile FreeBSD kernel with gcc48
on 11/11/2012 12:26 Garrett Cooper said the following: On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan a...@affle.com wrote: Hi, Anyone have experience compiling FreeBSD kernel with gcc48 I have tried it but no success with this in src.conf It would be more productive to detail no success. C= /usr/local/bin/gcc48 CXX= /usr/local/bin/g++48 CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds -Wno-missing-prototypes NO_WERROR= 1 Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46, gcc47 or gcc48? Uh, probably won't work because of FreeBSD modifications to gcc not being present in upstream IIRC... Which exact modifications do you have in mind? I was able to compile the kernel with gcc46. I used these settings: CC= /usr/local/bin/gcc46 CXX=/usr/local/bin/g++46 AS= /usr/local/bin/as LD= /usr/local/bin/ld NO_WERROR=yes WERROR= CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \ -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \ -Wno-pointer-sign -D__FreeBSD_cc_version=81 \ -Wno-unused-function -Wno-inline I guess that perhaps 'WERROR=' made the difference. -- Andriy Gapon ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Compile FreeBSD kernel with gcc48
On Sun, Nov 11, 2012 at 4:07 AM, Andriy Gapon a...@freebsd.org wrote: on 11/11/2012 12:26 Garrett Cooper said the following: On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan a...@affle.com wrote: Hi, Anyone have experience compiling FreeBSD kernel with gcc48 I have tried it but no success with this in src.conf It would be more productive to detail no success. C= /usr/local/bin/gcc48 CXX= /usr/local/bin/g++48 CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds -Wno-missing-prototypes NO_WERROR= 1 Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46, gcc47 or gcc48? Uh, probably won't work because of FreeBSD modifications to gcc not being present in upstream IIRC... Which exact modifications do you have in mind? I was able to compile the kernel with gcc46. I used these settings: CC= /usr/local/bin/gcc46 CXX=/usr/local/bin/g++46 AS= /usr/local/bin/as LD= /usr/local/bin/ld NO_WERROR=yes WERROR= CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \ -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \ -Wno-pointer-sign -D__FreeBSD_cc_version=81 \ -Wno-unused-function -Wno-inline I guess that perhaps 'WERROR=' made the difference. -fformat-extensions ? -Garrett ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Compile FreeBSD kernel with gcc48
on 11/11/2012 14:09 Garrett Cooper said the following: On Sun, Nov 11, 2012 at 4:07 AM, Andriy Gapon a...@freebsd.org mailto:a...@freebsd.org wrote: on 11/11/2012 12:26 Garrett Cooper said the following: On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan a...@affle.com mailto:a...@affle.com wrote: [snip] -Wno-format [snip] NO_WERROR= 1 [snip] WERROR= [snip] -fformat-extensions ? The above should take care of it. -- Andriy Gapon ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Compile FreeBSD kernel with gcc48
On 2012-11-11 10:59, Alie Tan wrote: Anyone have experience compiling FreeBSD kernel with gcc48 I have tried it but no success with this in src.conf C= /usr/local/bin/gcc48 CXX= /usr/local/bin/g++48 CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds -Wno-missing-prototypes NO_WERROR= 1 Last time I tried, I could get it to build with a gcc 4.8 snapshot, but it failed to boot. I did not investigate a great deal, but it looked a lot like some sort of optimization bug. Note that gcc 4.8 is still experimental, so problems like this can be expected. However, with gcc 4.7.1, which is a released version, the kernel did build, and even boot. With that kernel booted, I timed how long a make -j8 buildworld took, compared to booting with kernels compiled by gcc in base (v4.2.1) and clang in base (v3.2), on different optimization settings. The raw results are here: http://www.andric.com/freebsd/perftest/perftest-kernel-2012-09-25b.txt Summary: - Kernels compiled with clang 3.2 at -O2 are ~8% faster in system time than kernels compiled with gcc 4.2.1 at -O2. - Kernels compiled with clang 3.2 at -O2 perform equally to kernels compiled with gcc 4.7 at -O2, there is no significant difference. - Kernels compiled with gcc 4.7 at -O3 have a slight advantage in system time (~3.6%) against kernels compiled with clang 3.2 at -O2. (I did not test a kernel compiled with clang 3.2 at -O3.) Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46, gcc47 or gcc48? As said, I only tested clang 3.2 against gcc 4.2 from base, and gcc 4.7.1 (hand-built, since the version from ports is inexplicably some random snapshot, not a released version). If anybody is extremely interested in more results, they should sponsor some fast hardware, and donate it to the FreeBSD Project. ;-) ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
