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

Tue Jun 14 10:27:35 CEST 2011

'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?
+
+Cheers
+
+Col
+
+-- 
+
+Colin Guthrie
+mageia(at)colin.guthr.ie
+http://colin.guthr.ie/
+
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+