gcc options when building kernel
Hi all, I'm rebuilding my kernel and I noticed some gcc (I believe ) options being used that I don't think I set anyway. The options are : -mno-mmx -mno-3dnow -mno-sse -mno-sse2 Does this mean that the kernel won't make use of these cpu features, even though they are supported by the cpu (see below) Thanks! Beto MORE INFO They seem to appear throughout the kernel build process, for example: --- cc -O2 -fno-strict-aliasing -pipe -O2 -pipe -march=pentium-m -DAHC_REG_PRETTY_PRINT=1 -Werror -D_KERNEL -DKLD_MODULE -nostdinc -I- -DHAVE_KERNEL_OPTION_HEADERS -include /usr/obj/usr/src/sys/AYIIN/opt_global.h -I. -I@ -I@/contrib/altq -I@/../include -finline-limit=8000 -fno-common -g -I/usr/obj/usr/src/sys/AYIIN -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -ffreestanding -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -fformat-extensions -std=c99 -c /usr/src/sys/modules/aic7xxx/ahc/../../../dev/aic7xxx/aic7xxx.c cc -O2 -fno-strict-aliasing -pipe -O2 -pipe -march=pentium-m -DAHC_REG_PRETTY_PRINT=1 -Werror -D_KERNEL -DKLD_MODULE -nostdinc -I- -DHAVE_KERNEL_OPTION_HEADERS -include /usr/obj/usr/src/sys/AYIIN/opt_global.h -I. -I@ -I@/contrib/altq -I@/../include -finline-limit=8000 -fno-common -g -I/usr/obj/usr/src/sys/AYIIN -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -ffreestanding -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -fformat-extensions -std=c99 -c /usr/src/sys/modules/aic7xxx/ahc/../../../dev/aic7xxx/aic7xxx_93cx6.c --- from DMESG, my cpu is : --- CPU: Intel(R) Pentium(R) M processor 1.50GHz (1496.26-MHz 686-class CPU) Origin = GenuineIntel Id = 0x6d6 Stepping = 6 Features=0xafe9f9bfFPU,VME,DE,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,TM,PBE Features2=0x180EST,TM2 --- My /etc/make.conf is: - BOOTWAIT=4000 SUP_UPDATE=YES SUP=/usr/local/bin/cvsup SUPFILE=/usr/local/etc/stable-supfile PORTSSUPFILE=/usr/local/etc/ports-supfile ENABLE_WPA_SUPPLICANT_EAPOL=true NO_PROFILE=true NO_INET6=true NO_PORTSUPDATE=true NO_ATM=true X_WINDOW_SYSTEM=xorg DOC_LANG = en_US.ISO8859-1 CPUTYPE?=pentium-m CFLAGS+= -O2 -pipe # added by use.perl 2006-01-24 12:09:58 PERL_VER=5.8.7 PERL_VERSION=5.8.7 WITH_MOZILLA=firefox WITH_FAM_SYSTEM=fam ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: gcc options when building kernel
On Mon, Jan 30, 2006 at 08:27:29AM +1100, Norberto Meijome wrote: Hi all, I'm rebuilding my kernel and I noticed some gcc (I believe ) options being used that I don't think I set anyway. The options are : -mno-mmx -mno-3dnow -mno-sse -mno-sse2 Does this mean that the kernel won't make use of these cpu features, even though they are supported by the cpu (see below) Yes, since you *can't* use them in the FreeBSD kernel. google for more discussion. Kris pgpvG1UVDEPoF.pgp Description: PGP signature
Re: gcc options when building kernel
On Mon, Jan 30, 2006 at 08:27:29AM +1100, Norberto Meijome wrote: Hi all, I'm rebuilding my kernel and I noticed some gcc (I believe ) options being used that I don't think I set anyway. The options are : -mno-mmx -mno-3dnow -mno-sse -mno-sse2 Does this mean that the kernel won't make use of these cpu features, even though they are supported by the cpu (see below) Correct. The CPU registers associated with those CPU features must not be used inside the kernel, and therefore the build process explicitly disables them to avoid any mistakes. -- Insert your favourite quote here. Erik Trulsson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: gcc options when building kernel
On Mon, 2006-01-30 at 08:27 +1100, Norberto Meijome wrote: Hi all, I'm rebuilding my kernel and I noticed some gcc (I believe ) options being used that I don't think I set anyway. The options are : -mno-mmx -mno-3dnow -mno-sse -mno-sse2 Does this mean that the kernel won't make use of these cpu features, even though they are supported by the cpu (see below) Thanks! Beto MORE INFO They seem to appear throughout the kernel build process, for example: --- cc -O2 -fno-strict-aliasing -pipe -O2 -pipe -march=pentium-m -DAHC_REG_PRETTY_PRINT=1 -Werror -D_KERNEL -DKLD_MODULE -nostdinc -I- -DHAVE_KERNEL_OPTION_HEADERS -include /usr/obj/usr/src/sys/AYIIN/opt_global.h -I. -I@ -I@/contrib/altq -I@/../include -finline-limit=8000 -fno-common -g -I/usr/obj/usr/src/sys/AYIIN -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -ffreestanding -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -fformat-extensions -std=c99 -c /usr/src/sys/modules/aic7xxx/ahc/../../../dev/aic7xxx/aic7xxx.c cc -O2 -fno-strict-aliasing -pipe -O2 -pipe -march=pentium-m -DAHC_REG_PRETTY_PRINT=1 -Werror -D_KERNEL -DKLD_MODULE -nostdinc -I- -DHAVE_KERNEL_OPTION_HEADERS -include /usr/obj/usr/src/sys/AYIIN/opt_global.h -I. -I@ -I@/contrib/altq -I@/../include -finline-limit=8000 -fno-common -g -I/usr/obj/usr/src/sys/AYIIN -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -ffreestanding -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -fformat-extensions -std=c99 -c /usr/src/sys/modules/aic7xxx/ahc/../../../dev/aic7xxx/aic7xxx_93cx6.c --- from DMESG, my cpu is : --- CPU: Intel(R) Pentium(R) M processor 1.50GHz (1496.26-MHz 686-class CPU) Origin = GenuineIntel Id = 0x6d6 Stepping = 6 Features=0xafe9f9bfFPU,VME,DE,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,TM,PBE Features2=0x180EST,TM2 --- My /etc/make.conf is: - BOOTWAIT=4000 SUP_UPDATE=YES SUP=/usr/local/bin/cvsup SUPFILE=/usr/local/etc/stable-supfile PORTSSUPFILE=/usr/local/etc/ports-supfile ENABLE_WPA_SUPPLICANT_EAPOL=true NO_PROFILE=true NO_INET6=true NO_PORTSUPDATE=true NO_ATM=true X_WINDOW_SYSTEM=xorg DOC_LANG = en_US.ISO8859-1 CPUTYPE?=pentium-m CFLAGS+= -O2 -pipe # added by use.perl 2006-01-24 12:09:58 PERL_VER=5.8.7 PERL_VERSION=5.8.7 WITH_MOZILLA=firefox WITH_FAM_SYSTEM=fam I am curious about this as well... I searched the mailing list arhives, and googled for a bit, but didn't really come up with anything useful. Anyone have any pointers to the discussion that was mentioned previously? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
