Date: Thu, 14 Apr 2011 04:06:54 -0700 (PDT) From: Vassilis Laganakos <vassilis.laganakos@yahoo.com> To: Damjan Marion <damjan.marion@gmail.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: LLVM/Clang cross-compiling for ARM Message-ID: <475540.33003.qm@web112105.mail.gq1.yahoo.com>
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Hi Damjan, Mark,=0A=0A----- Original Message -----=0A=0A> From:Damjan Mario=
n <damjan.marion@gmail.com>=0A> To:Mark Tinguely <marktinguely@gmail.com>=
=0A> Cc:Vassilis Laganakos <vassilis.laganakos@yahoo.com>; "freebsd-arm@fre=
ebsd.org" <freebsd-arm@freebsd.org>=0A> Sent:Thursday, April 14, 2011 8:13 =
AM=0A> Subject:Re: LLVM/Clang cross-compiling for ARM=0A> =0A> =0A> Hi Mark=
,=0A> =0A> Seems that clang from current (made by i386 buildworld) is able =
to build ARM =0A> code:=0A> =0A> # clang -v=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A> =A0 =A0 FreeBSD clang=
version 2.9 (trunk 126547) 20110226=0A> Target: i386-undermydesk-freebsd9.=
0=0A> Thread model: posix=0A> =0AThat's the same I get when I build llvm/cl=
ang as a cross-compiler, and I thought that=0Asomething was wrong. I'd expe=
ct that to be: "arm-unknown-freebsd9.0", but it=0Aseems from your test bell=
ow that it does generate ARM code.=0A=0A> # clang -march=3Darmv7-a -mfloat-=
abi=3Dsoft -ccc-host-triple arm-elf -integrated-as =0A> hello.c -o hello.o =
-c=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A> =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =0A> # file hello.o=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =0A> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =0A> =A0 =0A> hello.o: ELF 32-bit LSB relo=
catable, ARM, version 1 (SYSV), not stripped=0A> =0A> # clang -march=3Darmv=
7-a -mfloat-abi=3Dsoft -ccc-host-triple arm-elf hello.c -o =0A> hello.S -S=
=0A> =0A> # cat hello.S=0A> =0A> =A0=A0=A0 .syntax unified=0A> =A0=A0=A0 .c=
pu cortex-a8=0A> =A0=A0=A0 .eabi_attribute 6, 10=0A> =A0=A0=A0 .eabi_attrib=
ute 7, 65=0A> =A0=A0=A0 .eabi_attribute 8, 1=0A> =A0=A0=A0 .eabi_attribute =
9, 2=0A> =A0=A0=A0 .eabi_attribute 10, 2=0A> =A0=A0=A0 .eabi_attribute 20, =
1=0A> =A0=A0=A0 .eabi_attribute 21, 1=0A> =A0=A0=A0 .eabi_attribute 23, 3=
=0A> =A0=A0=A0 .eabi_attribute 24, 1=0A> =A0=A0=A0 .eabi_attribute 25, 1=0A=
> =A0=A0=A0 .file=A0=A0=A0 "hello.c"=0A> =A0=A0=A0 .text=0A> =A0=A0=A0 .glo=
bl=A0=A0=A0 main=0A> =A0=A0=A0 .align=A0=A0=A0 2=0A> =A0=A0=A0 .type=A0=A0=
=A0 main,%function=0A> main:=0A> =A0=A0=A0 push=A0=A0=A0 {r11, lr}=0A> =A0=
=A0=A0 mov=A0=A0=A0 r11, sp=0A> =A0=A0=A0 sub=A0=A0=A0 sp, sp, #12=0A> =A0=
=A0=A0 mov=A0=A0=A0 r0, #0=0A> =A0=A0=A0 str=A0=A0=A0 r0, [r11, #-4]=0A> =
=A0=A0=A0 str=A0=A0=A0 r0, [sp, #4]=0A> =A0=A0=A0 movw=A0=A0=A0 r0, :lower1=
6:.L.str=0A> =A0=A0=A0 movt=A0=A0=A0 r0, :upper16:.L.str=0A> =A0=A0=A0 bl=
=A0=A0=A0 printf=0A> =A0=A0=A0 str=A0=A0=A0 r0, [sp]=0A> =A0=A0=A0 ldr=A0=
=A0=A0 r0, [sp, #4]=0A> =A0=A0=A0 mov=A0=A0=A0 sp, r11=0A> =A0=A0=A0 ldmia=
=A0=A0=A0 sp!, {r11, pc}=0A> .Ltmp0:=0A> =A0=A0=A0 .size=A0=A0=A0 main, .Lt=
mp0-main=0A> =0A> =A0=A0=A0 .type=A0=A0=A0 .L.str,%object=0A> =A0=A0=A0 .se=
ction=A0=A0=A0 .rodata.str1.1,"aMS",%progbits,1=0A> .L.str:=0A> =A0=A0=A0 .=
asciz=A0=A0=A0 "Hello World!\n"=0A> =A0=A0=A0 .size=A0=A0=A0 .L.str, 14=0A=
>=0A=0A=0AWell you proved the opposite from what we assumed, since this loo=
ks like ARM assembly to me :)=0A=0AAnyone knows if something has changed in=
http://wiki.freebsd.org/BuildingFreeBSDWithClang=0Asince it was last edite=
d?=0A=0A=0ADamjan, if you find some more info about this with llvm/clang, c=
ould you please post=0Athe links here? :)=0A=0AThanks,=0AVassilis=0A
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