[udunits] [UDUNITS #KIA-819973]: Build and run problem on ubuntu 13.10 32bits

• To: chgans@xxxxxxxxxxxxxx
• Subject: [udunits] [UDUNITS #KIA-819973]: Build and run problem on ubuntu 13.10 32bits
• From: "Unidata UDUNITS Support" <support-udunits@xxxxxxxxxxxxxxxx>
• Date: Tue, 15 Apr 2014 13:32:49 -0600

Chris,

What is the value of the MATH_LIBRARY variable in the file "CMakeCache.txt", 
which should be in the top-level build-directory?

> My point is: The latest udunits doesn't build on ubuntu:
> 
> $ rm -Rf build && mkdir build && cd build
> $ cmake ..
> $ make
> Scanning dependencies of target udunits2_doc
> [  5%] Built target udunits2_doc
> Scanning dependencies of target libudunits2
> [ 10%] Building C object lib/CMakeFiles/libudunits2.dir/converter.c.o
> [ 15%] Building C object lib/CMakeFiles/libudunits2.dir/error.c.o
> [ 21%] Building C object lib/CMakeFiles/libudunits2.dir/formatter.c.o
> [ 26%] Building C object lib/CMakeFiles/libudunits2.dir/idToUnitMap.c.o
> [ 31%] Building C object lib/CMakeFiles/libudunits2.dir/parser.c.o
> [ 36%] Building C object lib/CMakeFiles/libudunits2.dir/prefix.c.o
> [ 42%] Building C object lib/CMakeFiles/libudunits2.dir/status.c.o
> [ 47%] Building C object lib/CMakeFiles/libudunits2.dir/systemMap.c.o
> [ 52%] Building C object lib/CMakeFiles/libudunits2.dir/unitAndId.c.o
> [ 57%] Building C object lib/CMakeFiles/libudunits2.dir/unitcore.c.o
> [ 63%] Building C object lib/CMakeFiles/libudunits2.dir/unitToIdMap.c.o
> [ 68%] Building C object lib/CMakeFiles/libudunits2.dir/ut_free_system.c.o
> [ 73%] Building C object lib/CMakeFiles/libudunits2.dir/xml.c.o
> Linking C shared library libudunits2.so
> [ 84%] Built target libudunits2
> Scanning dependencies of target udunits2lib_doc
> [ 89%] Built target udunits2lib_doc
> Scanning dependencies of target udunits2
> [ 94%] Building C object prog/CMakeFiles/udunits2.dir/udunits2.c.o
> Linking C executable udunits2
> ../lib/libudunits2.so: undefined reference to `fmod'
> ../lib/libudunits2.so: undefined reference to `exp'
> ../lib/libudunits2.so: undefined reference to `log'
> ../lib/libudunits2.so: undefined reference to `pow'
> ../lib/libudunits2.so: undefined reference to `log10'
> ../lib/libudunits2.so: undefined reference to `floor'
> collect2: error: ld returned 1 exit status
> make[2]: *** [prog/udunits2] Error 1
> make[1]: *** [prog/CMakeFiles/udunits2.dir/all] Error 2
> make: *** [all] Error 2
> 
> The only way to fix it is to tell gcc that libudunits depends on libm
> while generating the .so:
> 
> Original command:
> /usr/bin/cc  -fPIC    -shared -Wl,-soname,libudunits2.so -o
> libudunits2.so [...] -lexpat
> Fixed command:
> /usr/bin/cc  -fPIC    -shared -Wl,-soname,libudunits2.so -o
> libudunits2.so [...] -lexpat -lm
> 
> After the fix:
> $ make
> [  5%] Built target udunits2_doc
> [ 84%] Built target libudunits2
> [ 89%] Built target udunits2lib_doc
> Linking C executable udunits2
> [ 94%] Built target udunits2
> Scanning dependencies of target udunits2prog_doc
> [100%] Built target udunits2prog_doc
> 
> > The sense of the "res == 0" test in the above is inverted: the
> > function returns false (i.e., 0) if and only if numeric values are not
> > convertible between the two units.
> 
> My bad! Actually the documentation is clear enough on that point.
> 
> > You should use ut_free(ut_unit*) and ut_free_system(ut_unit_system*)
> > in the above instead of free(). The documentation needs to be improved
> > in the area. I'll get on that.
> 
> My bad again, I think the documentation is clear enough.
> 
> > The above warnings are expected for the reasons given. You can disable them.
> 
> Good, I think i will eventually customise my unit definitions.

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: KIA-819973
Department: Support UDUNITS
Priority: Normal
Status: Closed

• Follow-Ups:
  • Re: [udunits] [UDUNITS #KIA-819973]: Build and run problem on ubuntu 13.10 32bits
    • From: chris