[Linux-ia64] Cross compiling problem: relocation truncated to fit ...

[Linux-ia64] Cross compiling problem: relocation truncated to fit ...

[Nuesser, Wilhelm]

Hi,

when cross compiling ia64 exec´s on an ia32 the cross-ld states
	
/usr/cross/lib/gcc-lib/ia64-gnu-linux-gnu/2.9-ia64-000216-final/crtbegin.o(.
fini+0x2): relocation truncated to fit: PCREL21B fini
This is reproduceable. When making the same - admittedly quite huge - exec
on an ia64 natively the make works
fine.

Any ideas? Just a stupid setup problem?

Thanks in advance

Willi

------------------
Willi Nüßer
SAP LinuxLab
wilhelm.nuesser@sap.com

Re: [Linux-ia64] Cross compiling problem: relocation truncated to fit ...

[David Mosberger]

Did you try the -relax option?  If your linker still isn't able to
build a big binary with that option specified, you need a newer
linker.  I do have a prebuilt version for NUE, but it will use
different paths from your own cross environment.

	--david

>>>>> On Fri, 28 Jul 2000 10:06:06 +0200, "Nuesser, Wilhelm" <wilhelm.nuesser@sap.com> said:

  Willi> Hi, when cross compiling ia64 exec´s on an ia32 the cross-ld
  Willi> states
	
  Willi> /usr/cross/lib/gcc-lib/ia64-gnu-linux-gnu/2.9-ia64-000216-final/crtbegin.o(.
  Willi> fini+0x2): relocation truncated to fit: PCREL21B fini This is
  Willi> reproduceable. When making the same - admittedly quite huge -
  Willi> exec on an ia64 natively the make works fine.

  Willi> Any ideas? Just a stupid setup problem?

  Willi> Thanks in advance

  Willi> Willi

  Willi> ------------------ Willi Nüßer SAP LinuxLab
  Willi> wilhelm.nuesser@sap.com


  Willi> _______________________________________________ Linux-IA64
  Willi> mailing list Linux-IA64@linuxia64.org
  Willi> http://lists.linuxia64.org/lists/listinfo/linux-ia64

Re: [Linux-ia64] Cross compiling problem: relocation truncated to fit ...

[Jim Wilson]

You have an out-of-range branch.  Branches can only reach about 16MB directly,
after that they need linker help.

If you have a recent enough toolchain, then -Wl,-relax will make this work.
It should work automatically, but well, eventually it will.  The recent
TurboLinux distribution RPMS have the necessary patches.  I don't believe any
Red Hat distribution RPMS have it yet, but the next release will.

A 32-bit hosted cross compiler will generate worse code than a native compiler.
This is because it is harder to optimize 64-bit values on a 32-bit machine, so 
there are some cases where we just give up and don't perform the optimization
when on a 32-bit host.  Thus the cross compiled application will be bigger,
and more likely to have out-of-range branches.  Don't cross compile unless
you have to.

Jim