[Mageia-dev] Cross compile x86_64 on i586 for icecream?

Tue Jun 14 11:45:04 CEST 2011

'Twas brillig, and Colin Guthrie at 14/06/11 09:27 did gyre and gimble:
+> 'Twas brillig, and Christiaan Welvaart at 13/06/11 12:24 did gyre and
+> gimble:
+>> On Mon, 13 Jun 2011, Colin Guthrie wrote:
+>>
+>>> I'm not exactly a guru with icecream but is it possible to build a
+>>> toolchain that can allow i586 nodes to compile x86_64 code?
+>>
+>> If your question is about the toolchain, have you tried simply passing
+>> -m64 to gcc?
+> 
+> OK, so for the record, this doesn't work.
+> 
+> However I checked out our tool chain and the RPMs accept some handy
+> arguments. Yay!
+> 
+> Sadly they don't really work!
+> 
+> I was able to build binutils via:
+>  rpmbuild --define "cross x86_64" --define "_topdir $(pwd)" -bb
+> SPECS/binutils.spec
+> 
+> But then I tried gcc via:
+>  rpmbuild --define "cross_bootstrap x86_64" --define "_topdir $(pwd)"
+> -bb SPECS/gcc.spec
+> 
+> (it needs to bootstrap to build glibc which can then be used to rebuild
+> gcc again fully).
+> 
+> Sadly this bombed out:
+> /home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/./gcc/xgcc
+> -B/home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/./gcc/
+> -B/usr/x86_64-mageia-linux-gnu/bin/ -B/usr/x86_64-mageia-linux-gnu/lib/
+> -isystem /usr/x86_64-mageia-linux-gnu/include -isystem
+> /usr/x86_64-mageia-linux-gnu/sys-include
+> --sysroot=/home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/../sysroot
+>   -O2 -g -pipe -m32 -O2  -O2 -g -pipe -DIN_GCC
+> -DCROSS_DIRECTORY_STRUCTURE -DNATIVE_CROSS  -W -Wall -Wwrite-strings
+> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
+> -Wold-style-definition  -isystem ./include  -fPIC -g  -DIN_LIBGCC2
+> -D__GCC_FLOAT_NOT_NEEDED   -I. -I. -I../../.././gcc -I../../../../libgcc
+> -I../../../../libgcc/. -I../../../../libgcc/../gcc
+> -I../../../../libgcc/../include -I../../../../libgcc/config/libbid
+> -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT
+> _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c
+> ../../../../libgcc/../gcc/libgcc2.c
+> In file included from ../../../../libgcc/../gcc/tsystem.h:87:0,
+>                  from ../../../../libgcc/../gcc/libgcc2.c:29:
+> /home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/./gcc/include-fixed/stdio.h:13:23:
+> fatal error: sys/types.h: No such file or directory
+> compilation terminated.
+> 
+> 
+> 
+> Now it seems that adding -Dinhibit_libc here works a treat, but I've no
+> idea if this is appropriate. The files sys/types.h is included in the
+> source but e.g. sys/syscall.h is not (this is subsequently needed if you
+> fix the include path to point at the included lsb headers).
+> 
+> 
+> As I know nothing about the tool chain....
+> 
+>  Q1. Should we be setting -Dinhibit_libc during this bootstrap stage?
+>  Q2. Would it be better to use the lsb-headers instead and somehow find
+> syscall.h?
+>  Q3. Am I doing something dumb?
+
+
+Added https://bugs.mageia.org/show_bug.cgi?id=1794 on RTPs request.
+
+:)
+
+
+-- 
+
+Colin Guthrie
+mageia(at)colin.guthr.ie
+http://colin.guthr.ie/
+
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