link error of liboctave (MinGW build)

[John W. Eaton]

On  7-Jan-2010, Tatsuro MATSUOKA wrote:

| I have at last reached to link stage of liboctave.  However, unfortunately, 
error occurred

| DLLs..libs/liboctave_la-glob-match.o:glob-match.cc:(.text+0x6e3): undefined 
reference to
| `rpl_glob(char const*, int, int (*)(char const*, int), glob_t*)'
| .libs/liboctave_la-glob-match.o:glob-match.cc:(.text+0x893): undefined 
reference
| to`rpl_globfree(glob_t*)'
| ../libgnu/.libs/libgnu.a(getlogin_r.o):getlogin_r.c:(.text+0x11): undefined 
reference to `getlogin'
| collect2: ld returned 1 exit status
| 
| For errors related glob, I have looked into glob.in.h

To see what is actually compiled, you should be looking at the
generated glob.h file in the libgnu directory of your build tree.

| The followings are found
| #define glob rpl_glob
| #define globfree rpl_globfree
| #define glob_pattern_p rpl_glob_pattern_p
| However there are no rpl_???? functions in glob.c.

I think this may be another case of missing extern "C" somewhere.
What is the output of

  nm libgnu/.libs/libgnu.a

?

| ../libgnu/.libs/libgnu.a(getlogin_r.o):getlogin_r.c:(.text+0x11): undefined 
reference to `getlogin'
| collect2: ld returned 1 exit status
| make[3]: *** [liboctave.la] Error 1
| make[3]: Leaving directory `/home/octaves/OctBuild/hg-devel/liboctave'
| make[2]: *** [all] Error 2
| make[2]: Leaving directory `/home/octaves/OctBuild/hg-devel/liboctave'
| make[1]: *** [all-recursive] Error 1
| make[1]: Leaving directory `/home/octaves/OctBuild/hg-devel'
| make: *** [all] Error 2
| 
| There remained errors.
| 
| For getlogin_r.c, I found symbol '_getlogin_r' in libgnu.a. 

Clearly the getlogin_r.c function from gnulib expects the getlogin
function to exist.  I'm not sure what the correct fix is here.    I'll
ask the gnulib maintainers.

jwe