This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
> From address@hidden Sat Sep 24 20:52:11 1994 Hi, > I was trying to install netcdf on IBM RS6000 AIX3.2.5 but got an error > message during the stage of "make test" > ============================================================================== > > making `test' in directory /var/tmp/jlchen/netcdf-232pl2/xdr > > make[1]: Entering directory `/var/tmp/jlchen/netcdf-232pl2/xdr' > ./xdrtest > xdrtest_out.new > diff xdrtest_out.new testout.sav > *** XDR passes formatted test *** > cmp test.xdr test_xdr.sav > *** XDR passes binary test *** > make[1]: Leaving directory `/var/tmp/jlchen/netcdf-232pl2/xdr' > > returning to directory /var/tmp/jlchen/netcdf-232pl2 > > > making `test' in directory /var/tmp/jlchen/netcdf-232pl2/libsrc > > make[1]: Entering directory `/var/tmp/jlchen/netcdf-232pl2/libsrc' > ar rcuv libnetcdf.a array.o attr.o cdf.o dim.o file.o iarray.o error.o > globdef.o putget.o putgetg.o sharray.o string.o var.o xdrposix.o > ranlib libnetcdf.a > xlc -O cdftest.o libnetcdf.a -o cdftest > ./cdftest > cdftest_out.new > ncattget: attribute "TITLE" not found > Assertion failed: file cdftest.c, line 393 > make[1]: *** [test] Error 1 > make[1]: Leaving directory `/var/tmp/jlchen/netcdf-232pl2/libsrc' > make: *** [libsrc/test] Error 1 > ============================================================================== > > So is there any ways to get around this problem? > Thanks! This has become one of our Frequently Asked Questions for netCDF. The answer from the netCDF FAQ (available as http://www.unidata.ucar.edu/packages/netcdf/faq.html): 12. Is there a problem with building netCDF under AIX 3.2? We have observed a problem with the optimizer in the C compiler of AIX 3.2. The default for our configure script is to specify optimization by using the "-O" compiler flag, but that causes the netCDF library to be built incorrectly under AIX 3.2, with the symptom that "make test" will fail even though there are no compile or link errors when building from source. A workaround is to build the netCDF library with CFLAGS="" (or "-g") explicitly, by setting the environment variable CFLAGS to "" or "-g" before invoking configure, or by using one of the other methods suggested in the INSTALL file to prevent the use of the "-O" flag for compilation. The specific file that is incorrectly compiled with "-O" is libsrc/string.c, so another workaround is to just compile that file without "-O". This problem will be fixed in the next release. It seems to work best if you delete the ncdump/ncdump and ncgen/ncgen executables before rerunning make, because otherwise they don't get relinked with the new version of the library (this seems to be a bug in the Makefile rules). -- Russ Rew UCAR Unidata Program address@hidden P.O. Box 3000 http://www.unidata.ucar.edu/ Boulder, CO 80307-3000