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Re: [Xen-devel] xen 4.4.0 dependency lzo fails to build from source due to fPIC

On 07/29/14 02:46, Jan Beulich wrote:
On 28.07.14 at 23:02, <anthony@xxxxxxxxxxxxxxx> wrote:
If xen detects lzo, it tries to build tools/xclib/libxenguest.so.4.4.0
with lzo support but fails with the error:

relocation R_X86_64_PC32 against symbol '_lzo_config_check' can not be
used when making a shared object; recompile with -fPIC

reading around the subject it would seem to be a problem with the lzo
library (2.08) which has been built without using the -fPIC option.
However, when I look at the lzo package there is no standard way to
build it with -fPIC. My workaround has been simply to remove the lzo
package, but I'm not sure this is a good solution, and I don't
understand why this problem doesn't seem to have been encountered before.

Should I be building Xen with LZO support? (does everybody else build
without LZO support?)

Should I be adding fPIC to the LZO options and rebuilding LZO?

Is there something else I'm doing wrong that is causing the problem?

This could also be "broken toolchain" as:

 Subject: Re: [Xen-devel] [Qemu-devel] [Bug 1257099] [NEW]
 QEMU fails to build on CentOS 5.10 with relocation
 R_X86_64_PC32 error - msg#00032

On 12/14/13 15:21, Don Slutz wrote:
On 12/09/13 08:22, Paolo Bonzini wrote:

Il 09/12/2013 13:47, Don Slutz ha scritto:

On 12/05/13 22:20, Don Slutz wrote:

On 12/05/13 16:24, Richard Henderson wrote:

On 12/06/2013 04:18 AM, Paolo Bonzini wrote:

$ gcc -shared -o f.so f.c -fPIE -fPIC
/usr/bin/ld: /tmp/ccQc9els.o: relocation R_X86_64_PC32 against `f'
can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: ld returned 1 exit status

The bug is simply that "-fPIE -fPIC" counts as -fPIE rather than -fPIC:

$ gcc -S -o - f.c -fPIE |grep call
    call    f                      # PC32 relocation
$ gcc -S -o - f.c -fPIC |grep call
    call    f@PLT                  # PLT32 relocation

The easy workaround is to drop -fPIE when we're adding -fPIC.



talks about.  From QEMU configure:

# check for broken gcc and libtool in RHEL5
if test -n "$libtool" -a "$pie" != "no" ; then
  cat > $TMPC <<EOF

void *f(unsigned char *buf, int len);
void *g(unsigned char *buf, int len);

void *
f(unsigned char *buf, int len)
    return (void*)0L;

void *
g(unsigned char *buf, int len)
    return f(buf, len);

  if ! libtool_prog; then
    echo "Disabling libtool due to broken toolchain support"

   -Don Slutz

The expectation is that there is a shared library to link against, not
just a static one. If you want the static-only case supported, then
you'll need to contribute patches (and imo those should then cover
not just lzo, but all of the compression methods other than lz4).


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