Templates and MingW

Re: Templates and MingW

Joemccay@... wrote:
> 
>    I am used to using VC++ 6.0 & templates.  I have found out that I have to explicitly instantiate templates
(after reading Tom
> Swan's GNU C++ book).

Is it an old book? It is not generally necessary to
instantiate templates explicitly with g++.

> Are there some examples/tutorials that show exmaples of all the possibility for link with templates under
> mingw?

See this URL:
  http://gcc.gnu.org/onlinedocs/gcc/Template-Instantiation.html
but bear in mind that mingw lacks 'collect2', so
'-frepo' won't work.

> Explicit instantiation is nice when you know know everything you want to use the template with, but that
may not be the
> case.  I would prefer to have the compiler automatically instantiate the instances of templates.

g++ does perform automatic instantiation. Its
shortcoming is that it does too much instantiation
automatically. But don't worry about that unless
measurements prove it's a problem for you.

>    I understand that explicit instantiation can make for cleaner code,

It makes the source more complicated and harder to
maintain. But it can make many object files smaller.

> but it seems to defeat the purpose of templates.

Agreed.

> How is the
> undefined reference problem gotten around in the STL for user defined templates?

I'm not sure what you mean--care to elaborate?

BTW, it's easier to read and reply to your email if
you post flat text with shorter lines. I get these
spam headers added to your original message--I
guess sourceforge adds them:

> X-Spam-Report: 2.5/5.0
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>         you can recognize or block similar mail in future.
[...]
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I am going to attempt to add Thread Local Storage to MingW

I have studied how TLS works in win32 and it doesnt seem that hard 
(especially since GCC already supports TLS for some platforms)

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how do I compile GCC?

I have gcc-g++-3.3.1-20030804-1-src.tar.gz, 
gcc-core-3.3.1-20030804-1-src.tar.gz & 
binutils-2.14.90-20030807-1-src.tar.gz from the MingW download page.

What do I need and what do I do/run in order to get a working MingW GCC 
build going?

Also, how would I go about contributing changes to MingW binutils and MingW 
GCC? (I wanna add Thread Local Storage support)

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strange linking dll PASCAL/WINAPI functions

Hello mingw-users,

My MinGW is from MinGW-2.0.0-3.exe

$ gcc --version
gcc.exe (GCC) 3.2 (mingw special 20020817-1)

I tried to write a simple ping program.
I used functions IcmpCreateFile(),IcmpCloseHandle() and IcmpSendEcho() from icmp.dll,
and inet_addr() from wsock32.dll.
I know for sure that all 4 are the PASCAL functions (mostly from
the lcc header files).

The ICMP functions are not declared in gcc headers, so I declared them
in my source as follows:

   extern HANDLE PASCAL IcmpCreateFile(void);
   extern BOOL WINAPI IcmpCloseHandle(HANDLE);
   extern DWORD PASCAL IcmpSendEcho(<arg list>);

The inet_addr() is declared in winsock2.h as

   unsigned long PASCAL inet_addr(const char*);

So far so good.
In my first attempt I built import libraries with the following
.def's:

(icmp.def)
EXPORT
IcmpCreateFile <at> 0
IcmpCloseHandle <at> 4
IcmpSendEcho <at> 32

(wsock32.def)
EXPORT
inet_addr <at> 4

All went ok: libs built, source compiled and exe built.
But when I run the mping.exe the dialog popped, saying that function
IcmpCreateFile <at> 0 wasn't found.

Then I took another way.
I removed the PASCAL word from function declarations in my source
and ***in the gcc's winsock2.h***. Changed .def's appropriately.
EXPORT
IcmpCreateFile
IcmpCloseHandle
IcmpSendEcho

EXPORT
inet_addr

Hmm... IT WORKS.

What's happening, please? Am I missing something?

--

-- 
Best regards,
 Сергей                          mailto:serge@...

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Re: strange linking dll PASCAL/WINAPI functions

With the original stdcall declarations you need to use the "--kill-at" flag
to dlltool when building the import libraries (just removing the PASCAL will
make programs crash). By default, the name stored in the import table and
the symbol in the import library are the same apart from underscores (e.g.
"IcmpCreateFile <at> 0") but when you add this flag it means that the name in the
.exe import table will be "IcmpCreateFile", while the symbol name remains
the same. This is necessary because the import library symbol has to match
what the compiler outputs and the import table must match the export table
of the DLL. If you look in the w32api source you'll see that the "-k"
(--kill-at) flag is used there too. However, inet_addr is already present in
the current version of libwsock32.a so you shouldn't need to add it (just
use -lwsock32 when linking).

Luke

----- Original Message ----- 
From: "Сергей Самоходкин" <serge@...>
To: <mingw-users@...>
Sent: Monday, September 01, 2003 9:59 PM
Subject: [Mingw-users] strange linking dll PASCAL/WINAPI functions

> Hello mingw-users,
>
> My MinGW is from MinGW-2.0.0-3.exe
>
> $ gcc --version
> gcc.exe (GCC) 3.2 (mingw special 20020817-1)
>
> I tried to write a simple ping program.
> I used functions IcmpCreateFile(),IcmpCloseHandle() and IcmpSendEcho()
from icmp.dll,
> and inet_addr() from wsock32.dll.
> I know for sure that all 4 are the PASCAL functions (mostly from
> the lcc header files).
>
> The ICMP functions are not declared in gcc headers, so I declared them
> in my source as follows:
>
>    extern HANDLE PASCAL IcmpCreateFile(void);
>    extern BOOL WINAPI IcmpCloseHandle(HANDLE);
>    extern DWORD PASCAL IcmpSendEcho(<arg list>);
>
> The inet_addr() is declared in winsock2.h as
>
>    unsigned long PASCAL inet_addr(const char*);
>
> So far so good.
> In my first attempt I built import libraries with the following
> .def's:
>
> (icmp.def)
> EXPORT
> IcmpCreateFile <at> 0
> IcmpCloseHandle <at> 4
> IcmpSendEcho <at> 32
>
> (wsock32.def)
> EXPORT
> inet_addr <at> 4
>
> All went ok: libs built, source compiled and exe built.
> But when I run the mping.exe the dialog popped, saying that function
> IcmpCreateFile <at> 0 wasn't found.
>
> Then I took another way.
> I removed the PASCAL word from function declarations in my source
> and ***in the gcc's winsock2.h***. Changed .def's appropriately.
> EXPORT
> IcmpCreateFile
> IcmpCloseHandle
> IcmpSendEcho
>
> EXPORT
> inet_addr
>
> Hmm... IT WORKS.
>
> What's happening, please? Am I missing something?
>
> -- 
> Best regards,
>  Сергей                          mailto:serge@...

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Re: how do I compile GCC?

Jonathan Wilson <jonwil@...> writes:

> I have gcc-g++-3.3.1-20030804-1-src.tar.gz,
> gcc-core-3.3.1-20030804-1-src.tar.gz &
> binutils-2.14.90-20030807-1-src.tar.gz from the MingW download page.
>
> What do I need and what do I do/run in order to get a working MingW
> GCC build going?

The package gcc-3.3.1-20030804-1-src.diff.gz, which contains the MinGW
specific patches, possibly contains an script for building MinGW. In
essence, on a POSIX environment, you follow the build instructions
included with GCC, that is, 'make bootstrap [options]'. The above
mentioned script does that adding the appropriate options. IIRC, Danny
Smith uses Cygwin, but it should work on MSYS too.

Don't forget to apply the MinGW specific patches before building the
retail GNU packages, unless you have a reason for not doing so.

> Also, how would I go about contributing changes to MingW binutils
> and MingW GCC? (I wanna add Thread Local Storage support)

There is a patch submission facility on the MinGW SourceForge page:

http://sourceforge.net/tracker/?group_id=2435&atid=302435

Have fun.

--

-- 
Oscar

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Increasing stack size

Is there a straight-forward way to increase MinGW's
run-time stack size?  I have some code that is very
heavily recursive, and under certain conditions when
the .exe is running it overflows the stack, which
terminates the program.  djgpp has a system variable
one can set to increase the stack size.  Does a
similar facility exist for MinGW?  I've checked the
archives, but couldn't find anything on point.

Thanks in advance.

Best regards,

Tom

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Re: Templates and Mingw