.. undefined reference to ..

[andreas graeper]

helo,

i try to make bacnetstack.
1) build static lib .a works (i guess)
2) build demos using lib stops
 error not each time in first demo-directory and all demos using the lib
 maybe the lib is rebuild for every demo (or at least in some cases) ?
 maybe an error in makefile (youtube: a whitespace character .. drives
crazy)

 xxx/
   include/
   src/
   lib/      <- lib_xxx.a
   demos/
    demo1/
    demo2/

  xxx/make first demo breaks (but cause of order)
  xxx/demo/make first demo works, second breaks

   same demo that breaks, but there is one that does not. generally the lib
works.
   difference in demo1/Makefile and demo2/Makefile is a $(TARGET).map that
is
   removed in 'clean'-target ( i have not heard about .map and did not find
enough info. so no clue )

    the working demo does not use the missing symbol.

when using `make -d ..` there is a line 'pruning lib_xxx.a' and i found
something with 'simplifying decision trees' (wikipedia). what does pruning
lib means ?

is there a step where only parts depending on wrong decision are extracted
from a static library so that in the end symbols are missing ? ( similiar
to wrong order of object-files when linking )

nm lib_xxx.a | grep ?symbol?
 shows symbols twice: T (in .txt) with address and U (undefined)
 i found (google): small differences in names, but demangling? only with
c++, not c.
 and i have equal symbols ( T and U ) maybe the linker finds the U-entry
first and  gives up ? ( but one demo works )

guess, the lib is ill.

hope, my English is not that bad.
hope, You can help.

thanks in advance,
andreas