compile multiple C codes to one single assembly file

Question

I want to compile multiple C files to a single assembly file (they are interconnected and when you compile it you will have a binary file). Is it possible in GCC?

For example take a look at this repo. The make file will generate a single file (a binary one).

However I want to compile them to assembly, instrument the code and then compile them to binary. Obviously it will be easier for me if I have all the assembly files in a single *.s file.

Any idea?

#include all those files into a single .c file and compile it — mvidelgauz
– mvidelgauz, Commented Jul 5, 2016 at 14:30
@mvidelgauz It won't work without modifications in most cases. — Eugene Sh.
– Eugene Sh., Commented Jul 5, 2016 at 14:31
@SamaAzari We are as gentle as possible. But it is likely that you ask from us to help you solve a problem you don't really have. — Eugene Sh.
– Eugene Sh., Commented Jul 5, 2016 at 14:51

fuz · Accepted Answer · 2016-07-05 15:15:49Z

7

I see three approaches:

Use cat to concatenate the assembly files. This should work unless two or more translation units use a static variable with the same name. This might be problematic if labels are used twice. You can preprocess the individal files with a sed-script like this to make the labels unique:
```
s/\.L$[[:alnum:]]*$/.L$ident\1/
```
where $ident is a unique string for each assembly file. This turns .Lfoo into .Lidentfoo.
Make a C source file that looks like this and compile it, same caveat as before:
```
#include "module1.c"
#include "module2.c"
...
#include "modulen.c"
```
Use ld -r to perform a partial link on a set of object files. This gives you one large object file containing the content of the other files. You can then use a tool like objconv to disassemble the object file, instrument it and reassemble. Note that this might not what you need.

edited Jul 5, 2016 at 15:15

answered Jul 5, 2016 at 14:41

fuz

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Sergio · Accepted Answer · 2016-07-05 14:40:37Z

2

You can try to glue all sources together with Amalgamate and then generate assembly output.

answered Jul 5, 2016 at 14:40

Sergio

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