#79 MinGW support for IT++

[Omid Rouhani]

Hi.

My name is Omid and I currently summer work at
Ericsson.
In our group we need to use IT++ together with the
MinGW-compiler (Minimalist GNU for Windows;
www.mingw.org). The current release of IT++ can't be
compiled with MinGW. However, this can easily be fixed
by just adding a few lines of code to IT++.

I suggest that the next release of IT++ should contain
these changes and be compatible with MinGW. With this
post I have attached a document that describes exactly
what changes must be made to IT++ to make it MinGW
compatible.

The changes are really small and for me it would be a
matter of a few minutes to make the changes from
scratch. Only two files need to be changed, but I have
made a few additional suggestions for improvement at
the bottom of the document.

The document is written in Swedish. However, since
most (all?) IT++-developers are swedish I guess it won't
be any problem.

Here is the abstract of the document is:

Detta dokument visar hur man lätt (med nĺgra fĺ extra
raders kod) kan fĺ IT++ att bli kompatibelt med
kompilatorn MinGW. Med den senaste versionen av IT++
(version 3.7.3) sĺ gĺr det inte att kompilera IT++ med
MinGW.

Dokumentet visar även hur man sedan kan kompilera
program som använder sig av IT++ med MinGW.

Avslutningsvis ges en lista med exakt vilka ändringar som
mĺste göras i IT++ för att det ska bli helt och hĺllet
MinGW-kompatibelt. Samtliga ändringar är smĺ ändringar
som kan göras med en relativt liten arbetsinsats.

---

Feel free to contact me with any questions or comments.

[Omid Rouhani]

Hur man kompilerar och kr IT++-program med MinGW

[Jianhong Wang]

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I also want to use MingW complie IT++. If you can translate
the pdf document into English, that will be a great help.

Basically I think I have figured out what I should do and
compiling is fine. However the make at tests folder still has
some problems. Any hints?

Thanks a lot for your great job.

[Omid Rouhani]

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If you have successfully compiled the IT++ using MinGW
(mingw32-g++.exe) and you have problems compiling your
test scriptsyou should:
1) If you use Cygwin: Make sure you use Windows paths
when using MinGW (that is, avoid giving flags like -
I/my/include, but instead use -Ic:\my\include (note the
double )).
2) It seems that there is a bug in MinGW when linking files
that uses the signgam variable declared in math.h.
To be able to compile and link your IT++ files you must make
sure that you somewhere create a variable "int signgam=0" in
your program.

That is, if your program looks like (which is a valid program in
GCC but not with MinGW):

include <math.h>

include <stdio.h>

int main(void)
{
printf("value: %i",signgam);
return 0;
}

Then replace it with (which is valid in MinGW):

include <math.h>

include <stdio.h>

include <addsigngam.h>

int main(void)
{
printf("value: %i",signgam);
return 0;
}

Where Addsigngam.h:

ifndef SIGNGAM_ADDED

define SIGNGAM_ADDED

int signgam=0;

endif

Since some functions in IT++ uses signgam, any test files
that you have that directly or indirectly uses this functions
can not be linked unless you in your code include
this "addsigngam.h" file.

/Omid

[Johan Bergman]

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Hej Omid,

I have made changes in scalfunc.h and timing.cpp according
to your proposal.

BR,
Johan

[Tony Ottosson Gadd]

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Changes have been checked into CVS by Johan Bergman.

/Tony

[Johan Bergman]

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I have not done all the requested changes yet, only the most
urgent ones. Maybe this bug report should be re-opened,
maybe as a feature request?

BR,
Johan