Re: "undefined reference" in .o files

Hmmm.
This issue is cropping up in our libraries. The general setup is that we have several libraries, each consisting of several 4gl files, each library in its own path under a parent …/functions/ path; so for example we have functions/base_lib, functions/print_lib, functions/workflow_lib and so on. Each path has several 4gls in it and we compile these down to a single .a file in each function path; thus we have:
<base_path>/functions/base_lib/base_lib.a
<base_path>/functions/print_lib/print_lib.a
<base_path>/functions/workflow_lib/workflow_lib.a

… and so on. Most of these 4gl library source files don’t have their own globals files but there is a single project globals file in ../../globals.4gl which each separate library 4gl references at compile time (i.e. they mostly have “GLOBALS ../../globals.4gl” as their first line).

We compile the libraries down to their own “.a” first and then for each project executable (which similarly reside in their own paths elsewhere) we compile its own 4gls and link in the library .a files

What I’ve found is that each library 4gl that calls ../../globals.4gl has the unresolved call, where the odd few that don’t are ok…
The ../../globals.4gl file is not compiled (we don’t do it on our current HP-UX system and it’s never caused a problem!)

So, if I’ve got this right,  the 4gls are individually compiling and are happy with the globals include line but I need to link in a ‘globals.o’ built from the ../../globals.4gl as well? (To confirm, I just did a 4glpc –c of this globals file and it does indeed have the correct hash number in the resultant .o).



From: [email protected] [mailto:[email protected]] On Behalf Of Mike Aubury
Sent: 03 February 2015 17:07
To: Malcolm Perrior
Cc: [email protected]
Subject: Re: [Aubit4gl-discuss] "undefined reference" in .o files

Its normally because you're not linking in something you should be...
Maybe you have an empty GLOBALS file which you have in the GLOBALS  section - but isnt on being linked in ?

The hex stuff is just a hash  meant to check that the module and globals are in line - so there should be a "globals.4gl" (the bit before the hex - but after the init_global_variables) which defines the init_global_variables_globals_<hex>.

If the globals.c has a  "init_global_variables_globals_..." - but its different hex hash - then the "hashing" is different between the two - perhaps globals.4gl was compiled at a different time - and has had something change ?
(The hashing is based on the variables defined)





On 3 February 2015 at 16:54, Malcolm Perrior <[email protected]<mailto:[email protected]>> wrote:
Well, testbedding of the Windows binary continues apace!

How about this one: compilation of 4gl code seems to create a call to a function with a name of the format

void init_global_variables_globals_<hex_number>(void)

It places this line in the top of the .c compiled from the .4gl amongst the A4GL_FUNCTION definitions for the functions in the 4gl file, and calls it in the c function  A4GL_INTERNAL_FUNCTION static void init_module_variables(void); there is a comment line immediately above it saying “/// Initialise any other global variables”

So when we compile and link all our output object files together we get an error complaining about an undefined reference…
The <hex number> seems arbitrary.

Any clues on this one?

(Sorry to continue being a pain. Oh and also apologies for the extended disclaimer in my company email, can’t fix that, sorry!)



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