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c++ - Eliminate duplicated strings ...

reply mx0 seznam.cz writes:
Is any option of dmc to eliminate duplicated strings in the final executables
while linking? (like e.g. in msvc); and possibly storing string constants (like
__FILE__) in read only memory - I didn't found anything, even with -o+space the
strings are still duplicated in the executable ... normally it is not problem,
except .exe size, but when I build 16-bit DOS exes and use __FILE__ in debugging
macros, I often reach the DOS data seg size limit :-/
Jul 24 2005
parent reply "Walter" <newshound digitalmars.com> writes:
<mx0 seznam.cz> wrote in message news:dbvn4v$2576$1 digitaldaemon.com...

 Is any option of dmc to eliminate duplicated strings in the final


executables

 while linking? (like e.g. in msvc); and possibly storing string constants


(like

 __FILE__) in read only memory - I didn't found anything, even


with -o+space the

 strings are still duplicated in the executable ... normally it is not


problem,

 except .exe size, but when I build 16-bit DOS exes and use __FILE__ in


debugging

 macros, I often reach the DOS data seg size limit :-/


Here's an old technique I used for developing DOS programs because of that
problem.

--------------------------------
static char __file__[] = __FILE__;

#undef assert
#define assert(e) ((e) || (local_assert(__LINE__), 0))

void my_assert ( char * , int );

static void local_assert(int line)
{
    my_assert(__file__,line);
}
------------------------------------------

which cuts down a lot on the size of the code generated by assert().
Jul 24 2005
parent reply mx0 seznam.cz writes:
In article <dc0hsp$1ho$1 digitaldaemon.com>, Walter says...

Here's an old technique I used for developing DOS programs because of that
problem.

--------------------------------
static char __file__[] = __FILE__;

#undef assert
#define assert(e) ((e) || (local_assert(__LINE__), 0))

void my_assert ( char * , int );

static void local_assert(int line)
{
    my_assert(__file__,line);
}
------------------------------------------

which cuts down a lot on the size of the code generated by assert().



Ok, I know this technique, I only asked if I have some options to do it more
natively (and furthermore, this technique, AFAIK, won't work in headers, e.g.
inside class templates, 'cause I think I cannot use "static char __file__[] =
__FILE__;" in header file included to more cpps). That means, there is no such
stuff in dmc, em I right? (I know, rely on this functionality is not the best
approach, while the C/C++ compiler is not liable to do such optimization, but it
were very handy especially for 16-bit DOS programs). Never mind, I will try to
do thinks I need smarter way :). But anyway, thanks for reply.
Jul 25 2005
parent "Walter" <newshound digitalmars.com> writes:
<mx0 seznam.cz> wrote in message news:dc24oa$19ak$1 digitaldaemon.com...

 Ok, I know this technique, I only asked if I have some options to do it


more

 natively (and furthermore, this technique, AFAIK, won't work in headers,


e.g.

 inside class templates, 'cause I think I cannot use "static char


__file__[] =

 __FILE__;" in header file included to more cpps). That means, there is no


such

 stuff in dmc, em I right? (I know, rely on this functionality is not the


best

 approach, while the C/C++ compiler is not liable to do such optimization,


but it

 were very handy especially for 16-bit DOS programs). Never mind, I will


try to

 do thinks I need smarter way :). But anyway, thanks for reply.


I know you can't get it all into a .h file, but here's what I do:

static char __file__[] = __FILE__;
#include        "tassert.h"

It's just two lines that are boilerplate cut & paste per source file. It is
especially handy for DOS programs, because not only does it share the
__FILE__ string, the local assert function will always be a 'near' function
(saving bytes) and each assert only generates the __LINE__ (the __file__ is
supplied by the near function), saving even more bytes.
Jul 30 2005