[netCDF #CBL-968606]: NetCDF 4.0.1/4.1: shared libs fail with ifort on x86_64

> Hi,
> 
> I'm trying to build NetCDF 4.0.1 on Ubuntu (Hardy) x86_64, using the
> Intel Fortran compiler:
> 
> ifort (IFORT) 10.1 20080312
> 
> and the build fails because the Fortran object files are non-PIC:
> 
> /usr/bin/ld: ../f90/.libs/libnetcdff90.a(netcdf4.o): relocation
> R_X86_64_32 against `a local symbol' can not be used when making a
> shared object; recompile with -fPIC
> 
> (A shared build without Fortran is fine, as is a static build with Fortran.)
> 
> 
> This appears to be because configure is trying the obsolete ifort -KPIC
> option, and concluding that PIC isn't supported: (from config.log)
> 
> configure:18190: checking for ifort option to produce PIC
> configure:18447: result: -KPIC
> configure:18456: checking if ifort PIC flag -KPIC works
> configure:18474: ifort -c -g -KPIC conftest.f >&5
> ifort: command line remark #10148: option '-K' not supported
> configure:18478: $? = 0
> configure:18491: result: no
> 
> 
> This test appears to originate in m4/libtool.m4, and has been changed
> (to the modern -fPIC) in the latest libtool: (from the libtool 2.2.6b
> ChangeLog)
> 
> 2008-06-19  Ralf Wildenhues  <address@hidden>
> 
> * libltdl/m4/libtool.m4 (_LT_COMPILER_PIC) [linux] <icc, icpc>:
> Use -fPIC, newer Intel compilers (icc 10, ifort 9) reject -KPIC.
> * tests/localization.at: Skip test if the compiler fails merely
> due to the locale setting.
> * THANKS: Update.
> Report by Vincent Lefevre.
> 
> Perhaps a libtool update is needed in the source tree?  (This problem
> still occurs with netcdf-4.1-snapshot2010020500 as well.)

Howdy Zak!

Thanks for suggesting this, just in time for the 4.1 release. I have upgraded 
the libtool version on the machine that produces the release, to take advantage 
of the latest bug fixes.

> 
> As a local workaround, I'm changing the configure script by hand to
> choose -fPIC for ifort; the build then proceeds without problems.
> 

It is never necessary to edit the configure file. Simply set environmental 
variable CFLAGS to -fPIC before calling the configure script (first doing a 
make clean).

Thanks,

Ed

Ticket Details
===================
Ticket ID: CBL-968606
Department: Support netCDF
Priority: Normal
Status: Closed