Date: Mon, 30 Jan 2006 08:27:29 +1100 From: Norberto Meijome <freebsd@meijome.net> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: gcc options when building kernel Message-ID: <43DD3341.4070103@meijome.net>
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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=0xafe9f9bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,TM,PBE> Features2=0x180<EST,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 ----
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