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How to dump path to source from object-file

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0

Assume I have a C object-file app.o compiled with gcc. How can I dump the file path to the original app.c from which app.o was compiled. My goal is to create a listing of all symbols + respective source file path using the binutils and gcc toolsuite.
By no means am I expecting an all-in-one solution. So I tried playing with multiple tools to gather the information I need.

Inspecting the object-file with a text-editor reveals that (appart from a lot of unreadable binary gibberish) the file does contain a reference to app.c as a string embedded into the object-file format. However I did not find a way to extract that string using objdump or nm.

I was hoping objdump would have some flag that could extract this source file string, but after trying virtually all options documented in the man page I still couldn't find it.

With the path of the source file I was hoping I could run gcc -M <path-to-source>. This would allow me to look through all the headers included by app.c and find the in-source declarations.

Suppose a simple app.c like this:

void foo(void) 

Compile it via gcc -c app.c -o app.o.

Running objdump -t app.o dumps the symbol table, but does not refer anywhere to the original app.c.
Running cat app.o does show that the object-file contains the file path to app.c (relative to pwd at compile-time). But I wasn't exactly planning on writing my own object-file parser just to get to that string.

c gcc objdump object-files nm

share|improve this question

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could dwarfdump help you?
  
  – doron
  Mar 27 at 13:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I quickly looked into it, indeed dwarfdump might be usable for what I need. Only downside is that it requires the object file to be built with debug information (gcc -g ...), which isn't that big of a deal tbh. What I'm more worried about is availability on MinGW. I didn't mention it in the original post, but I would like to have it working on native Linux and MinGW.
  
  – Chief_Gokhlayeh
  Mar 27 at 14:13
  

  
  
  
  

add a comment | 

0

Assume I have a C object-file app.o compiled with gcc. How can I dump the file path to the original app.c from which app.o was compiled. My goal is to create a listing of all symbols + respective source file path using the binutils and gcc toolsuite.
By no means am I expecting an all-in-one solution. So I tried playing with multiple tools to gather the information I need.

Inspecting the object-file with a text-editor reveals that (appart from a lot of unreadable binary gibberish) the file does contain a reference to app.c as a string embedded into the object-file format. However I did not find a way to extract that string using objdump or nm.

I was hoping objdump would have some flag that could extract this source file string, but after trying virtually all options documented in the man page I still couldn't find it.

With the path of the source file I was hoping I could run gcc -M <path-to-source>. This would allow me to look through all the headers included by app.c and find the in-source declarations.

Suppose a simple app.c like this:

void foo(void) 

Compile it via gcc -c app.c -o app.o.

Running objdump -t app.o dumps the symbol table, but does not refer anywhere to the original app.c.
Running cat app.o does show that the object-file contains the file path to app.c (relative to pwd at compile-time). But I wasn't exactly planning on writing my own object-file parser just to get to that string.

c gcc objdump object-files nm

share|improve this question

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could dwarfdump help you?
  
  – doron
  Mar 27 at 13:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I quickly looked into it, indeed dwarfdump might be usable for what I need. Only downside is that it requires the object file to be built with debug information (gcc -g ...), which isn't that big of a deal tbh. What I'm more worried about is availability on MinGW. I didn't mention it in the original post, but I would like to have it working on native Linux and MinGW.
  
  – Chief_Gokhlayeh
  Mar 27 at 14:13
  

  
  
  
  

add a comment | 

Assume I have a C object-file app.o compiled with gcc. How can I dump the file path to the original app.c from which app.o was compiled. My goal is to create a listing of all symbols + respective source file path using the binutils and gcc toolsuite.
By no means am I expecting an all-in-one solution. So I tried playing with multiple tools to gather the information I need.

Inspecting the object-file with a text-editor reveals that (appart from a lot of unreadable binary gibberish) the file does contain a reference to app.c as a string embedded into the object-file format. However I did not find a way to extract that string using objdump or nm.

I was hoping objdump would have some flag that could extract this source file string, but after trying virtually all options documented in the man page I still couldn't find it.

With the path of the source file I was hoping I could run gcc -M <path-to-source>. This would allow me to look through all the headers included by app.c and find the in-source declarations.

Suppose a simple app.c like this:

void foo(void) 

Compile it via gcc -c app.c -o app.o.

Running objdump -t app.o dumps the symbol table, but does not refer anywhere to the original app.c.
Running cat app.o does show that the object-file contains the file path to app.c (relative to pwd at compile-time). But I wasn't exactly planning on writing my own object-file parser just to get to that string.

c gcc objdump object-files nm

share|improve this question

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

void foo(void) 

share|improve this question

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

share|improve this question

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

asked Mar 27 at 13:32

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

1 Answer
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0

To answer my own question minutes after posting it (duh!):

readelf -s app.o prints a symbol table including the name of the source file (app.c). With that I am able to run gcc -M app.c and then parse through all header files to gather the symbol declarations.

share|improve this answer

edited Mar 28 at 19:04

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

add a comment | 

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0

To answer my own question minutes after posting it (duh!):

readelf -s app.o prints a symbol table including the name of the source file (app.c). With that I am able to run gcc -M app.c and then parse through all header files to gather the symbol declarations.

share|improve this answer

edited Mar 28 at 19:04

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

add a comment | 

0

To answer my own question minutes after posting it (duh!):

readelf -s app.o prints a symbol table including the name of the source file (app.c). With that I am able to run gcc -M app.c and then parse through all header files to gather the symbol declarations.

share|improve this answer

edited Mar 28 at 19:04

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

add a comment | 

To answer my own question minutes after posting it (duh!):

readelf -s app.o prints a symbol table including the name of the source file (app.c). With that I am able to run gcc -M app.c and then parse through all header files to gather the symbol declarations.

share|improve this answer

edited Mar 28 at 19:04

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

share|improve this answer

edited Mar 28 at 19:04

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges

answered Mar 27 at 13:39

Chief_GokhlayehChief_Gokhlayeh

122 bronze badges