how does icc work with kernel?

doooom · 发表于 2003-5-28 06:07:12

The new release of intel c++ compiler 7.1 is said to be much more compatible with gnu c extentions and gcc binaries. The only detailed doc i can got on google is some pdf stuff from intel, which is about the version 6.0.
http://www.intel.com/software/products/compilers/c60l/techtopics/LinuxCompilersCompatibility60.pdf
A successful internal test on compiling linux kernel 2.4.17 is mentioned in that pdf. in the contrary, some claimed in LFS mailing list that 's impossible to compile kernel w/ 6.0. A little modification I guess should have done before the intel people did the internal test.

come back to 7.1. w/ the more compatibility, is there any possible to do the kernel with the new versioin? I can't get any reports on this, so Mr. Dragonfly can help some.? many thx

PS: went thru your web page, you really have tons of papers, PF PF.

Dragonfly · 发表于 2003-5-28 09:47:25

en? where u get my homepage link? i do not remember i post here.

i think u can try it, why not? and tell me the result, i do not have icc here

doooom · 发表于 2003-5-28 09:58:58

I have not tried it coz got a time out when openning the first step to evaluation download, the survey page.
http://www.intel.com/software/products/compilers/clin/eval.htm
can't click thru here, you can give it a try.

Dragonfly · 发表于 2003-5-28 10:23:40

try this one, i am downloading
http://gentoo.oregonstate.edu/distfiles/l_cc_p_7.1.006.tar

doooom · 发表于 2003-5-28 12:10:32

oh, thx alot, it even can't be found on edonkey, which only has 7.1 for win

doooom · 发表于 2003-5-28 15:35:35

finally I get thru that survey page w/IE

and received a license file. the cpp comipler was also installed all right w/ the lisence file. however when i run the icc alone like

doooom $ icc

got :
/usr/lib/crt1.o: In function `_start':
/usr/lib/crt1.o(.text+0x1

: undefined reference to `main'

configure the default compiler as:
export LD=xild
export AR=xiar
export CC=icc
export CXX=icc

and try some linux code to compile, in the "./configure" stage, got:
checking for C compiler default output... configure: error: C compiler cannot create executables

how about your icc?
ps: if using gentoo, you can emerge it.

Dragonfly · 发表于 2003-5-28 21:19:54

yes, i emerge it, that is why i know where to download. but i do not have lic file. i have to get one.

i already get one lic file and my icc works now

dragonfly doc # icc
iccbin: Command line error: no files specified; for help type "iccbin -help"

on there support site has faq for u problem.

Dragonfly · 发表于 2003-5-28 22:00:31

http://www.intel.com/software/products/compilers/techtopics/LinuxCompilersCompatibility702.pdf is the new version of that pdf.

http://lwn.net/Articles/13207/ is a patch for 2.5.43.
http://lwn.net/Articles/14293/

Dragonfly · 发表于 2003-5-29 03:09:16

i send an email to intel to ask for the 2.4.20 patch, but no reply. anyway, i use the icc to compile the alsa-tools-0.93, some are ok, and some have problem. becuase linux kernel use some nonstandard c features that gcc supports while icc not support. if u have interest, u can try that 2.5.43 patch first.

doooom · 发表于 2003-5-29 06:13:19

the /usr/lib/crt1.o error is due to my old bash. cz it doesnot support the parameter -a for exec. I deleted the -a '<path" following the exec in both icc and icpc, when the problem solved.
configure error is some kind of stupid, i forget to unset the cflag and cxxflag for gcc. icc does not recognize -march and gives no out put.

the compiler works perfectly, when i tried to compile 'distcc', which is a simple package w/ only thousands of lines of code.

thx for the compability doc, it's said in it that icc works well on 2.4.17. it will be perfect if the versioni is 2.4.18.

many iptables patches need >=2.4.18 , so does the traffic control patches.

http://lwn.net/Articles/14293/ is the patch for 2.5.45. I'll figure out that tnght. actually 2.5.45 supports much better hyper-threading than 2.4 series.

Dragonfly · 发表于 2003-5-29 06:22:22

icc know -march, c&p from man icc
[code:1]
   -march=<cpu> Generate code excusively for a given <cpu>

                  pentiumpro -- Pentium(R) Pro and Pentium(R) II processor
                  instructions

                  pentiumii -- MMX(TM)instructions

                  pentiumiii -- Streaming SIMD Extensions

                  pentium4 -- Pentium(R) 4 New Instructions

   -mcpu=<cpu> Optimize for a specific cpu

                  pentium -- Optimize for Pentium(R) processor

                  pentiumpro -- Optimize for Pentium(R) Pro, Pentium(R) II
                  and Pentium(R) III processors

                  pentium4 -- Optimize for Pentium(R) 4 processor
[/code:1]

why u need to stick to icc?

doooom · 发表于 2003-5-29 06:27:34

hehe, thx

march=pentium3
this's gcc set.
littles diff. from icc's pentiumiii

Dragonfly · 发表于 2003-5-29 06:32:19

yes, but funny. mine is p4, so no problem.

doooom · 发表于 2003-5-29 10:13:29

the 2.4.45 patch installed alright. to let kernel use icc, I modified Makefile to change gcc and g++ to icc.

however when make menuconfig, it tells
$ make menuconfig
icc -Wp,-MD,scripts/.fixdep.d -O1 -o scripts/fixdep scripts/fixdep.c
ld: unrecognized option '--compile_dependencies'
ld: use the --help option for usage information
make[1]: *** [scripts/fixdep] 4└N⎽ 1
make: *** [scripts] 4└N⎽ 2

do you meet the same stuff?
like to know whether my binutils is too old for icc.

Dragonfly · 发表于 2003-5-29 10:25:23

u also need change LD to xild, and AR to xiar

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