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Old 11-02-2008, 11:53 PM   #1
jackandking
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Registered: Dec 2004
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who include "it"

how to trace the include path of target .h file?

for example:

file A.c:
Code:
#include "a.h";//may include d.h
#include "b.h";//may include d.h
#include "c.h";//may include d.h
...
I know d.h is included in A.c, but it's not included explicitly.
my question is: where is it from?

any tools to finish such query in more complex case?

thanks in advance!
 
Old 11-03-2008, 12:44 AM   #2
ta0kira
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Registered: Sep 2004
Distribution: FreeBSD 9.1, Kubuntu 12.10
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Doxygen does a good job because it documents header dependencies if you enable it. It's used to generate header references, if you haven't used it before. It's a bit much if you aren't creating something with a lot of headers that needs documentation to distribute with it.
ta0kira
 
Old 11-03-2008, 12:54 AM   #3
Sergei Steshenko
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Registered: May 2005
Posts: 4,481

Rep: Reputation: 454Reputation: 454Reputation: 454Reputation: 454Reputation: 454
Quote:
Originally Posted by jackandking View Post
how to trace the include path of target .h file?

for example:

file A.c:
Code:
#include "a.h";//may include d.h
#include "b.h";//may include d.h
#include "c.h";//may include d.h
...
I know d.h is included in A.c, but it's not included explicitly.
my question is: where is it from?

any tools to finish such query in more complex case?

thanks in advance!
Just run 'cpp' (C PreProcessor) on file(s), for example this file


Code:
cat -n curlies_return_value.c
     1  #include <stdio.h>
     2
     3  int main()
     4    {
     5    int retval = ({int i = 1; int j = 2; i + j;});
     6    printf("retval=%d\n", retval);
     7    return 0;
     8    }
produces this output:

Code:
sergei@amdam2:~/junk> cpp curlies_return_value.c | grep '#'
# 1 "curlies_return_value.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "curlies_return_value.c"
# 1 "/usr/include/stdio.h" 1 3 4
# 28 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/features.h" 1 3 4
# 322 "/usr/include/features.h" 3 4
# 1 "/usr/include/sys/cdefs.h" 1 3 4
# 324 "/usr/include/sys/cdefs.h" 3 4
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 325 "/usr/include/sys/cdefs.h" 2 3 4
# 323 "/usr/include/features.h" 2 3 4
# 345 "/usr/include/features.h" 3 4
# 1 "/usr/include/gnu/stubs.h" 1 3 4
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 5 "/usr/include/gnu/stubs.h" 2 3 4
# 1 "/usr/include/gnu/stubs-32.h" 1 3 4
# 8 "/usr/include/gnu/stubs.h" 2 3 4
# 346 "/usr/include/features.h" 2 3 4
# 29 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 1 3 4
# 214 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 3 4
# 35 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/include/bits/types.h" 1 3 4
# 28 "/usr/include/bits/types.h" 3 4
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 29 "/usr/include/bits/types.h" 2 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 1 3 4
# 32 "/usr/include/bits/types.h" 2 3 4
# 134 "/usr/include/bits/types.h" 3 4
# 1 "/usr/include/bits/typesizes.h" 1 3 4
# 135 "/usr/include/bits/types.h" 2 3 4
# 37 "/usr/include/stdio.h" 2 3 4
# 45 "/usr/include/stdio.h" 3 4
# 65 "/usr/include/stdio.h" 3 4
# 75 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/libio.h" 1 3 4
# 32 "/usr/include/libio.h" 3 4
# 1 "/usr/include/_G_config.h" 1 3 4
# 14 "/usr/include/_G_config.h" 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 1 3 4
# 326 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 3 4
# 355 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 3 4
# 15 "/usr/include/_G_config.h" 2 3 4
# 24 "/usr/include/_G_config.h" 3 4
# 1 "/usr/include/wchar.h" 1 3 4
# 48 "/usr/include/wchar.h" 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 1 3 4
# 49 "/usr/include/wchar.h" 2 3 4
# 1 "/usr/include/bits/wchar.h" 1 3 4
# 51 "/usr/include/wchar.h" 2 3 4
# 76 "/usr/include/wchar.h" 3 4
# 25 "/usr/include/_G_config.h" 2 3 4
# 44 "/usr/include/_G_config.h" 3 4
# 1 "/usr/include/gconv.h" 1 3 4
# 28 "/usr/include/gconv.h" 3 4
# 1 "/usr/include/wchar.h" 1 3 4
# 48 "/usr/include/wchar.h" 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 1 3 4
# 49 "/usr/include/wchar.h" 2 3 4
# 29 "/usr/include/gconv.h" 2 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h" 1 3 4
# 32 "/usr/include/gconv.h" 2 3 4
# 45 "/usr/include/_G_config.h" 2 3 4
# 33 "/usr/include/libio.h" 2 3 4
# 53 "/usr/include/libio.h" 3 4
# 1 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stdarg.h" 1 3 4
# 43 "/usr/lib/gcc/i586-suse-linux/4.2.1/include/stdarg.h" 3 4
# 54 "/usr/include/libio.h" 2 3 4
# 167 "/usr/include/libio.h" 3 4
# 177 "/usr/include/libio.h" 3 4
# 200 "/usr/include/libio.h" 3 4
# 268 "/usr/include/libio.h" 3 4
# 316 "/usr/include/libio.h" 3 4
# 325 "/usr/include/libio.h" 3 4
# 361 "/usr/include/libio.h" 3 4
# 413 "/usr/include/libio.h" 3 4
# 451 "/usr/include/libio.h" 3 4
# 481 "/usr/include/libio.h" 3 4
# 76 "/usr/include/stdio.h" 2 3 4
# 89 "/usr/include/stdio.h" 3 4
# 141 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/bits/stdio_lim.h" 1 3 4
# 142 "/usr/include/stdio.h" 2 3 4
# 188 "/usr/include/stdio.h" 3 4
# 206 "/usr/include/stdio.h" 3 4
# 231 "/usr/include/stdio.h" 3 4
# 245 "/usr/include/stdio.h" 3 4
# 274 "/usr/include/stdio.h" 3 4
# 285 "/usr/include/stdio.h" 3 4
# 306 "/usr/include/stdio.h" 3 4
# 400 "/usr/include/stdio.h" 3 4
# 442 "/usr/include/stdio.h" 3 4
# 466 "/usr/include/stdio.h" 3 4
# 477 "/usr/include/stdio.h" 3 4
# 510 "/usr/include/stdio.h" 3 4
# 591 "/usr/include/stdio.h" 3 4
# 644 "/usr/include/stdio.h" 3 4
# 680 "/usr/include/stdio.h" 3 4
# 699 "/usr/include/stdio.h" 3 4
# 722 "/usr/include/stdio.h" 3 4
# 731 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/bits/sys_errlist.h" 1 3 4
# 27 "/usr/include/bits/sys_errlist.h" 3 4
# 761 "/usr/include/stdio.h" 2 3 4
# 780 "/usr/include/stdio.h" 3 4
# 820 "/usr/include/stdio.h" 3 4
# 850 "/usr/include/stdio.h" 3 4
# 2 "curlies_return_value.c" 2
sergei@amdam2:~/junk>
Read "man cpp" for further info; you might need to use "gcc -E" instead of "cpp".
 
Old 11-03-2008, 01:02 AM   #4
jackandking
Member
 
Registered: Dec 2004
Posts: 92

Original Poster
Rep: Reputation: 15
thanks for reply.

i know doxygen is powerfu, but it seems cost too much to generate all the include path while i only need trace one .h file.

gcc -E or cpp produce lots of output in my case, any tool available to parse them?
 
Old 11-03-2008, 01:17 AM   #5
abolishtheun
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Registered: Mar 2008
Posts: 183

Rep: Reputation: 31
and... why can't you just do a grep for d.h on the header files?
 
Old 11-03-2008, 03:28 AM   #6
jackandking
Member
 
Registered: Dec 2004
Posts: 92

Original Poster
Rep: Reputation: 15
sorry for my unclear expression.
I am not looking for path(/path/d.h),
but include relation trace like: a include b, b include c, c include d => a include d
 
Old 11-03-2008, 04:51 AM   #7
Sergei Steshenko
Senior Member
 
Registered: May 2005
Posts: 4,481

Rep: Reputation: 454Reputation: 454Reputation: 454Reputation: 454Reputation: 454
Quote:
Originally Posted by jackandking View Post
thanks for reply.

i know doxygen is powerfu, but it seems cost too much to generate all the include path while i only need trace one .h file.

gcc -E or cpp produce lots of output in my case, any tool available to parse them?
It's UNIX, isn't it ?

Again:

Code:
cat -n curlies_return_value.c
     1  #include <stdio.h>
     2
     3  int main()
     4    {
     5    int retval = ({int i = 1; int j = 2; i + j;});
     6    printf("retval=%d\n", retval);
     7    return 0;
     8    }

Code:
cpp curlies_return_value.c | grep '#' | cut -d' ' -f3 | sort | uniq
"<built-in>"
"<command-line>"
"curlies_return_value.c"
"/usr/include/bits/stdio_lim.h"
"/usr/include/bits/sys_errlist.h"
"/usr/include/bits/types.h"
"/usr/include/bits/typesizes.h"
"/usr/include/bits/wchar.h"
"/usr/include/bits/wordsize.h"
"/usr/include/features.h"
"/usr/include/_G_config.h"
"/usr/include/gconv.h"
"/usr/include/gnu/stubs-32.h"
"/usr/include/gnu/stubs.h"
"/usr/include/libio.h"
"/usr/include/stdio.h"
"/usr/include/sys/cdefs.h"
"/usr/include/wchar.h"
"/usr/lib/gcc/i586-suse-linux/4.2.1/include/stdarg.h"
"/usr/lib/gcc/i586-suse-linux/4.2.1/include/stddef.h"
- pay attention to the added "| cut -d' ' -f3 | sort | uniq".
 
Old 11-03-2008, 07:50 PM   #8
jackandking
Member
 
Registered: Dec 2004
Posts: 92

Original Poster
Rep: Reputation: 15
I get it, thanks a lot!
 
  


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