Date: Fri, 10 May 2013 12:59:31 -0400 From: "Mikhail T." <mi+thun@aldan.algebra.com> To: ports@FreeBSD.org, gerald@FreeBSD.org Cc: dim@FreeBSD.org Subject: Why can't lang/gcc4X compilers build kernel modules? Message-ID: <518D2773.40504@aldan.algebra.com>
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It seems, none of the gcc-ports have the FreeBSD-extensions, that are worked
into the base cc. This is fine for regular ports, but the consumers of
bsd.kmod.mk (such as print/acroreadwrapper or multimedia/cuse4bsd-kmod) all
choke. For example:
gcc46 -O2 -pipe -march=prescott -fno-strict-aliasing -Werror -D_KERNEL
-DKLD_MODULE -nostdinc -I. -I@ -I@/contrib/altq -finline-limit=8000
--param inline-unit-growth=100 --param large-function-growth=1000
-fno-common -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx
-mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffreestanding -std=iso9899:1999
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef
-Wno-pointer-sign -fformat-extensions -c linux_adobe.c
cc1: error: unrecognized command line option '-mno-align-long-strings'
cc1: error: unrecognized command line option '-fformat-extensions'
*** Error code 1
Would it be too much work to extend the port-installed compilers the same way
gcc-4.2.1 in the base is extended? May be not for gcc4[89], which are complete
rewrites, but for 4.[4-7]? If not too difficult, should it be done?
Once implemented, it would become easier to build the entire kernel using a
newer compiler. And dim@ (CC-ed) has already demonstrated non-trivial speed-ups
obtained by building the kernel with gcc-4.7 over gcc-4.2:
http://lists.freebsd.org/pipermail/freebsd-current/2012-November/037842.html
http://www.andric.com/freebsd/perftest/perftest-kernel-2012-09-25b.txt
Yours,
-mi
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