Are there any C tools that can find redundant #includes in a project,
so as to shorten compile time? Of course, eliminating single
#includes by hand and determining if the recompile fails is one
option, though that is an extremely manual and time-intensive
approach. Thanks,
--
Benjamin
15  2774 
Benjamin Rutt <br********@blo omington.in.us> wrote in
news:wc******** *****@mu.cis.oh io-state.edu: Are there any C tools that can find redundant #includes in a project,
so as to shorten compile time? Of course, eliminating single
#includes by hand and determining if the recompile fails is one
option, though that is an extremely manual and time-intensive
approach. Thanks,
This trick will eliminate including the same file multiple times per
compile:
/* foo.h
*/
#ifndef FOO_H_INCLUDED
#define FOO_H_INCLUDED
/* foo.h file contents
*
#endif /* FOO_H_INCLUDED */
--
- Mark ->
--
"Mark A. Odell" <no****@embedde dfw.com> writes: This trick will eliminate including the same file multiple times per
compile:
/* foo.h
*/
#ifndef FOO_H_INCLUDED
#define FOO_H_INCLUDED
/* foo.h file contents
*
#endif /* FOO_H_INCLUDED */
Thanks, I'm sorry, I knew of that trick actually, and I've rarely seen
a header file without it...I guess I misstated my question. I was
actually talking about #includeing files that you don't need at all,
not even once, so my using 'redundant' was incorrect. I should have
asked:
How do you find which header files aren't used at all by a single
compilation unit, and can safely be deleted from a the .c file?
--
Benjamin
Benjamin Rutt wrote: How do you find which header files aren't used at all by a single
compilation unit, and can safely be deleted from a the .c file?
I believe this falls under the topic of "lint," such as declaring unused
variables, code blocks that do nothing (ie "if (0 == 1) {[...]}", etc...),
redundant stuff ("a = 1; a = 5"), and all the other junk that accumulates
as projects evolve.
I would use a lint checker for that.
I have used the Gimpel lint checker ( www.gimpel.com) quite successfully,
I'm sure there are others including free ones.
--
gabriel
Mark A. Odell wrote: Benjamin Rutt <br********@blo omington.in.us> wrote in
news:wc******** *****@mu.cis.oh io-state.edu:
Are there any C tools that can find redundant #includes in a project,
so as to shorten compile time? Of course, eliminating single
#includes by hand and determining if the recompile fails is one
option, though that is an extremely manual and time-intensive
approach. Thanks,
This trick will eliminate including the same file multiple times per
compile:
/* foo.h
*/
#ifndef FOO_H_INCLUDED
#define FOO_H_INCLUDED
/* foo.h file contents
*
#endif /* FOO_H_INCLUDED */
The file opening time may be reduced by using:
#ifndef FOO_H_INCLUDED
#include "foo.h"
#endif
Finding and opening a file is one of the major items
for compilation times. Also, in Mark's version, the
compiler must scan all the code looking for the
#endif, which takes time.
--
Thomas Matthews
C++ newsgroup welcome message: http://www.slack.net/~shiva/welcome.txt
C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.l earn.c-c++ faq: http://www.raos.demon.uk/acllc-c++/faq.html
Other sites: http://www.josuttis.com -- C++ STL Library book
Thomas Matthews <Th************ *************** *@sbcglobal.net > wrote in
news:tK******** ***********@new ssvr16.news.pro digy.com: This trick will eliminate including the same file multiple times per
compile:
/* foo.h
*/
#ifndef FOO_H_INCLUDED
#define FOO_H_INCLUDED
/* foo.h file contents
*
#endif /* FOO_H_INCLUDED */
The file opening time may be reduced by using:
#ifndef FOO_H_INCLUDED
#include "foo.h"
#endif
Finding and opening a file is one of the major items
for compilation times. Also, in Mark's version, the
compiler must scan all the code looking for the
#endif, which takes time.
Doesn't this approach become cumbersome and error prone with many source
files and many header files? The standard way I mentioned means that the
user of the header file can blissly include the header file without fear
of multiple definition warnings.
--
- Mark ->
--
Thomas Matthews wrote: The file opening time may be reduced by using:
#ifndef FOO_H_INCLUDED
#include "foo.h"
#endif
Finding and opening a file is one of the major items
for compilation times. Also, in Mark's version, the
compiler must scan all the code looking for the
#endif, which takes time.
No!
The C preprocessor remembers the names of *idempotent* header files
and will *not* attempt to find, open or read them a second time.
Your suggestion is out-of-date and no longer necessary or useful.
"E. Robert Tisdale" <E.************ **@jpl.nasa.gov > writes: Thomas Matthews wrote:
The file opening time may be reduced by using:
#ifndef FOO_H_INCLUDED
#include "foo.h"
#endif
Finding and opening a file is one of the major items
for compilation times. Also, in Mark's version, the
compiler must scan all the code looking for the
#endif, which takes time.
No!
The C preprocessor remembers the names of *idempotent* header files
and will *not* attempt to find, open or read them a second time.
Your suggestion is out-of-date and no longer necessary or useful.
No, some implementations of the C preprocessor do this. I have no
idea how many, but it's unwise to assume that they all do. (Not that
it matters, since there's no real functional difference.)
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://www.sdsc.edu/~kst>
Schroedinger does Shakespeare: "To be *and* not to be"
E. Robert Tisdale wrote: The C preprocessor remembers the names of *idempotent* header files
and will *not* attempt to find, open or read them a second time.
Your suggestion is out-of-date and no longer necessary or useful.
Cammon, you know better than that! Of course, _some_ implementations might
do this, but then if you want to bring up implementation-specific features,
then I could chime in and say we're all fool for discussing this topic
given that precompiled headers exist.
--
gabriel This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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