list of non-impimented functions? (GCC) - Stack Overflow

admin管理员组

文章数量:1122832

I'm looking at a LARGE code base 800 C files, 700 or so H files

There are a number of cases where: (A) a prototype exists in a header But (B) there is no actual implementation of the function.

I can solve (B) - but no (A).

To Solve (B) - I can compile everything and get symbol tables out of the object files that tells me what exists and is implemented.

To solve (A) - I have no means to extract DECLARED lists in header files etc in the form of a list.

NOTE: This is not a problem that: -Wimplicit-function-declaration will solve. The functions are implemented across the 800 or so C files (and some a few ASM files, these are covered because I will just run "nm" on all object files).

In some/many cases the developers wrote a list of "gee we should have these" functions, but never actually implemented the functions. Grr...

Is there a way to get this list of prototypes and globals vars out of GCC?

VISUAL studio does this - it puts squiggly green lines under the function name but - I'm not using Visual Studio

I'm looking at a LARGE code base 800 C files, 700 or so H files

There are a number of cases where: (A) a prototype exists in a header But (B) there is no actual implementation of the function.

I can solve (B) - but no (A).

To Solve (B) - I can compile everything and get symbol tables out of the object files that tells me what exists and is implemented.

To solve (A) - I have no means to extract DECLARED lists in header files etc in the form of a list.

NOTE: This is not a problem that: -Wimplicit-function-declaration will solve. The functions are implemented across the 800 or so C files (and some a few ASM files, these are covered because I will just run "nm" on all object files).

In some/many cases the developers wrote a list of "gee we should have these" functions, but never actually implemented the functions. Grr...

Is there a way to get this list of prototypes and globals vars out of GCC?

VISUAL studio does this - it puts squiggly green lines under the function name but - I'm not using Visual Studio

• gcc

Share Improve this question Follow asked Nov 22, 2024 at 0:33 user3696153user3696153 75277 silver badges1616 bronze badges 4

• It isn't quite clear what the actual problem is. Are you trying to extract a list of declared but unimplemented functions? – n. m. could be an AI Commented Nov 22, 2024 at 2:11
• yes exactly. put another way if i can get a list of all declared functions and variables in each of my 800 translation units, then i can later post process the 800 lists and come up with a list of missing implementations – user3696153 Commented Nov 22, 2024 at 14:32
• When you compile and link, you'll get "undefined function" errors for all the unimplemented functions. – Barmar Commented Nov 22, 2024 at 16:34
• Not the case - that only occurs if they are used in the application. If the function is not used, there is no error and no warning. – user3696153 Commented Nov 22, 2024 at 20:33

Add a comment  | 

1 Answer 1

Sorted by: Reset to default 2

ctags is your friend.

 ctags --kinds-c=f -ofunctions.lst -R .
 ctags --kinds-c=p -oprototypes.lst -R .

You will get two files, one that lists function definitions and one with standalone function prototypes. You will need to diff these files (suitably massaged) to get a list of prototypes that have no corresponding definitions anywhere.

For the same thing with variables, use --kinds-c=v and --kinds-c=x. You can combine several kinds, like --kinds-c=fv.

I use Exuberant ctags, but there are other implementations out there which may or may not have these options.

本文标签： list of nonimpimented functions (GCC)Stack Overflow