topic Re: Adding tags in Executable in Operating System - HP-UX

Adding tags in Executable

Vibhor Kumar Agarwal — Thu, 28 Apr 2005 08:11:42 GMT

Sorry I had to start a new thread as that magical answer sign was creating a problem.

Okay so finally getting the feeling that there is nothing in HP like mcs.

But still I have to try and finally came upto something after so many days.
Some help needed for this.

ld has some options which may be useful for me:
+h file_name
It says it gives an internal name to the generated shared lib. Now what is this internal name?

It also states something about mapfile. I unable to figure out what is the use of mapfile.

I have a 2 step compilation process
First:
aCC -c flags ( produces .o )
Second:
aCC objs flags -o file

Now how can i add my +h option here.
I am passing flags to the linker using "flags" -> -Wl,+s,-a,default
Here i am trying to pass +h name but it gives me error.
I also tried -c file ( in which i had given the +h), it doesn't work either.

Please help

Re: Adding tags in Executable

Ermin Borovac — Thu, 28 Apr 2005 08:41:08 GMT

FWIW command called 'what' will print out identification information about executable or library if source file(s) used to compile contain the following line.

char ident[] = "@(#)identification information";

$ what a.out
a.out: identification information

Re: Adding tags in Executable

Vibhor Kumar Agarwal — Thu, 28 Apr 2005 09:36:34 GMT

This is what i exactly want to do, and what i had being doing in Solaris.

But for that i didn't had to touch the source code in solaris.

I used mcs.
I read the man pages of aCC and came up with some options that could help me to achieve that thing.
I am just unable to put it together.

Re: Adding tags in Executable

Stephen Keane — Thu, 28 Apr 2005 10:13:53 GMT

mcs adjusts the .comment field in an ELF executable. So I guess the first thing you have to ensure is that you are creating an ELF executable and not a PA-RISC one, then we'd have to find somthing that lets you change the .comment field.

Re: Adding tags in Executable

Vibhor Kumar Agarwal — Thu, 28 Apr 2005 23:35:33 GMT

On doing file operation on my .sl, I am getting

ELF-64 shared object file - PA-RISC 2.0 (LP64)

What is this, it contains both ELF and PA_RISC.

I know ELF but nothing about the latter one.
Going to google.

Re: Adding tags in Executable

Stephen Keane — Fri, 29 Apr 2005 02:40:03 GMT

That's OK, what you didn't want to see was

PA-RISC1.1 shared executable
or something similar without the ELF part.

Re: Adding tags in Executable

Vibhor Kumar Agarwal — Fri, 29 Apr 2005 09:15:47 GMT

Okay,

So now help me to solve it.

Re: Adding tags in Executable

Stephen Keane — Fri, 29 Apr 2005 10:11:40 GMT

Probably the only way you're going to get anywhere near what you want is to

(a) create a file called say ident.c
and place in it the identification string as suggested by ermin.

(b) semi-compile that ident.c file into an ident.o file (once)

(c) semi-compile your code as normal to .o stage.

(d) When linking, include the ident.o file in the link line.

Use 'what' on your executable to get the ident info.

This sort of meets your requirements as you have made no changes to your code, you are merely relinking it. If you want a different ident in each executable, as opposed to a project wide ident that effectively is a version number, then you'd have to create multiple ident.o file. When you change the ident, you just relink, you don't have to recompile your code.

Re: Adding tags in Executable

Vibhor Kumar Agarwal — Sun, 01 May 2005 23:57:25 GMT

So,

Finally something to work on.
Good option!

I was thinking something else.
I was searching about that internal name which i mentioned in my first post.

Till now i am unable to find out what is it.
If it somehow gives an name to the executable then we can use that option also.

Can you help me in this case.
Thanks

Re: Adding tags in Executable

Stephen Keane — Tue, 03 May 2005 04:44:53 GMT

They way I understood it, the +h flag gives a shared library an internal name, and thus wouldn't be of any use in your case for use in an executable.

Re: Adding tags in Executable

Vibhor Kumar Agarwal — Tue, 03 May 2005 08:56:51 GMT

Yup,

I used the term executable in a general way (.sl and executable )

Yesterday I read the whole linker man page and experimented for a couple of hours.
Finally got the +h option right.

For strict executables i found one more thing. Mapfiles
While reading the man pages, what i figured out is that it can be used to add something to the executables.

But even after hours of experimenting i wasn't able to write a mapfile.
It always gave me syntax error.

Can anybody guide me to write a simple mapfile.