Re: Patch for XL C/C++ and Fortran on Linux

[Roger Ferrer Ibáñez]

Hi again,

> It doesn't look too bad.  It'd be good to see some test results with it,
> though.  For these, you should download libtool-1.5.22 (or use CVS
> branch-1-5), apply your changes to the libtool.m4 file in that tree, run
>   ./bootstrap
> and the usual ./configure && make, then follow the instructions in
> README to run the test suite and report failures verbosely.

They are gzip-attached into the message.

CC=xlc
CXX=xlC
F77=xlf

====================================
5 of 105 tests failed
(7 tests were not run)
Please report to address@hidden
====================================

Additional environment information:

* powerpc64-unknown-linux-gnu
* gcc version 3.3.3 (SuSE Linux)
* GNU ld version 2.15.90.0.1.1 20040303 (SuSE Linux)


> BTW, what is gxlc/gxlc++, and do they cause $GCC=yes (i.e., do they
> define __GNUC__ unconditionally, or maybe just when some flag is or
> is not given)?   This corresponds to:
> | checking whether we are using the GNU C compiler... yes

I think it is just a driver that converts gcc-style parameters into xlc 
ones. It does not defines __GNUC__ unconditionally.

> Hmm.  One safe way would be to simply disable shared libraries for xlf
> on GNU/Linux.  Or use $LD.  But I strongly assume the latter to open up
> another can of worms ... maybe this way is rather reliable in practice.

Ok.

> > On the other hand, when using CC=gcc CXX=g++ and F77=xlf, "-fPIC" flag 
> > "sticks" on the invocation of xlf (it should be -qpic), what I'm doing 
> > wrong in this case?
>
> Could you show an example exposing this issue?

$ env CC=gcc F77=xlf ../source/configure
  ...
checking for xlf option to produce PIC... -fPIC
checking if xlf PIC flag -fPIC works... yes
checking if xlf static flag -static works... yes
  ...
$ make
  ...
xlf -g -c ../source/autotestfor.f  -fPIC -o 
.libs/libautotestfor_la-autotest.o
  ...
xlf -g -c ../source/autotestfor.f -o libautotestfor_la-autotestfor.o 
>/dev/null 2>&1
/bin/sh ./libtool --mode=link xlf  -g   -o libautotestfor.la -rpath 
/usr/local/lib  libautotestfor_la-autotestfor.lo
gcc -shared  .libs/libautotestfor_la-autotestfor.o   -Wl,-soname 
-Wl,libautotestfor.so.0 -o .libs/libautotestfor.so.0.0.0
/readonly/usr/bin/../lib/gcc-lib/powerpc-suse-linux/3.3.3/../../../../powerpc-suse-linux/bin/ld: 
Error: The symbol `_xlfBeginIO' has a R_PPC_REL24 relocation, that means 
'.libs/libautotestfor_la-autotestfor.o' was compiled without -fPIC.

however when using CC=xlc and F77=xlf

$ env CC=xlc F77=xlf ../source/configure
  ...
checking for xlf option to produce PIC... -qpic
checking if xlf PIC flag -qpic works... yes
checking if xlf static flag  works... yes
checking if xlf supports -c -o file.o... yes

And everything links flawlessly.

$ make
  ...
 xlf -g -c ../source/autotestfor.f  -qpic -o 
.libs/libautoprovafor_la-autotestfor.o
  ...
/bin/sh ./libtool --mode=link xlf  -g   -o libautoprovafor.la -rpath 
/usr/local/lib  libautoprovafor_la-autoprovafor.lo
xlc -qmkshrobj  .libs/libautoprovafor_la-autoprovafor.o   -Wl,-soname 
-Wl,libautoprovafor.so.0 -o .libs/libautoprovafor.so.0.0.0

Maybe "xlf*)" is not in the correct place?

> Some very minor nits inline.

I'll fix them in a future patch.

Thanks!

--
Roger Ferrer Ibáñez - address@hidden

check_xlc_xlC_xlf.gz
Description: GNU Zip compressed data