math/ggobi: compile error with clang

[Rainer Hurling]

I just discovered, that math/ggobi does not compile with clang, see:

http://pointyhat.freebsd.org/errorlogs/amd64-errorlogs/e.9-exp.20110616185105/ggobi-2.1.9.log

It seems, the main error is in 'line control' statement of 
src/ggobi-data.c, l.45

#line 0 "data.gob"
static void ggobi_data_class_init (GGobiDataClass * c) G_GNUC_UNUSED;

The official cpp online docs on 
http://gcc.gnu.org/onlinedocs/cpp/Line-Control.html defines

#line linenum
linenum is a non-negative decimal integer constant. It specifies the 
line number which should be reported for the following line of input. 
Subsequent lines are counted from linenum.

It seems gcc accepts the 0 (zero) as valid, whilst clang produces an 
error '#line directive requires a positive integer argument'.

What is the meaning of line 0 in this context? At line 1 (the first line 
in src/data.gob) there is the initiation '%h{' for the whole file 
contents. Does 0 mean, take the whole file?

Would it be correct to change value 0 into 1 (#line 1)? At least, gcc is 
able to build that and it seems to work fine.

My system is compiled with gcc, so it would be nice, if someone would 
give it a try with clang.

Many thanks in advance,
Rainer Hurling