Date: Mon, 22 Oct 2007 14:45:55 -0400 From: "Josh Carroll" <josh.carroll@gmail.com> To: freebsd-stable@freebsd.org Subject: buildworld failure (boot2.ld too big when CFLAGS set in make.conf) Message-ID: <8cb6106e0710221145k178e17can30bc90f65431f660@mail.gmail.com>
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Hello, During buildworld on RELENG_7 csup'd as of 10/22, it dies in sys/boot/i386/boot2 with: ===> sys/boot/i386/boot2 (all) -533 bytes available *** Error code 1 Stop in /usr/src/sys/boot/i386/boot2. *** Error code 1 I took a look at the cc command line: cc -Os -fno-guess-branch-probability -fomit-frame-pointer -fno-unit-at-a-time -mno-align-long-strings -mrtd -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -DUFS1_AND_UFS2 -DFLAGS=0x80 -DSIOPRT=0x3f8 -DSIOFMT=0x3 -DSIOSPD=9600 -I/usr/src/sys/boot/i386/boot2/../../common -I/usr/src/sys/boot/i386/boot2/../btx/lib -I. -Wall -Waggregate-return -Wbad-function-cast -Wcast-align -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings -Winline --param max-inline-insns-single=100 -ffreestanding -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -m32 -march=i386 -O2 -mmmx -msse -msse2 -msse3 -pipe -S -o boot2.s.tmp /usr/src/sys/boot/i386/boot2/boot2.c Since CFLAGS defined in make.conf are being tacked onto the calls to cc, and the last -O argument is the one that's effective with gcc, it's effectively building with O2 optimizations instead of Os to target smaller code size. Here is my entry in make.conf: CFLAGS+=-O2 -mmmx -msse -msse2 -msse3 -pipe To avoid this, I wrapped setting CFLAGS with an .if so it doesn't happen for the boot2 build: # don't append to CFLAGS here, it breaks compilation of boot2. .if ! ${.CURDIR:M*/boot/i386/boot2*} CFLAGS+=-O2 -mmmx -msse -msse2 -msse3 -pipe .endif But is there a better way to do this? I don't think using -O2 is overly aggressive for building world/ports, but obviously for things that require a small code size, it's going to break. Is what I'm doing above the best work around? Or am I missing an easier/more standard solution? Can I prepend to a variable in make.conf instead of appending (so that -Os comes _after_ -O2)? Thanks, Josh
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