[Mingw-notify] [ mingw-Bugs-1849022 ] Another bad compilation

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Bugs item #1849022, was opened at 2007-12-12 01:14
Message generated for change (Comment added) made by jkarretero_
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Category: gcc
Group: Waiting User Response
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: jkarretero (jkarretero_)
Assigned to: Nobody/Anonymous (nobody)
Summary: Another bad compilation

Initial Comment:
I compile bug.c (attached) saccesfully. However, the execution has a bug.
The output of the program is:
result=87
.i=4206603
.i=4206603
.i=4206603
.i=4206603
...

When it is expected to be:
result=87
.i=0
.i=1
.i=2
.i=3
...

The source no_bug.c (attached) gives the expected output. The only difference between bug.c and no_bug.c is the line 40.
Line 40 bug.c    -> printf("%s", ".");
Line 40 no_bug.c -> printf(".");

The value returned by WlanSetProfile is the expected. 87 means ERROR_INVALID_PARAMETER. See msdn documentation for details: http://msdn2.microsoft.com/en-us/library/ms706795.aspx

Wlanapi.dll and wlanapi.lib can be found in Microsoft Windows SDK v6.0.


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>Comment By: jkarretero (jkarretero_)
Date: 2007-12-19 10:12

Message:
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user_id=1847057
Originator: YES

Thanks Danny!
You are completely right.

The bug is fixed doing the following:

- add __stdcall to the prototype of WlanSetProfile
- rename wlanapi.lib to libwlanapi.a
- compile with gcc -L./ -o bug.exe bug.c -lwlanapi

Furthermore, bug.c executes perfectly with the last releases of packages.

Sorry because I thought I had the last releases of packages, and this was
an old bug.

Jesus.


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Comment By: Danny Smith (dannysmith)
Date: 2007-12-18 08:21

Message:
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jkarretero wrote 

"But compiling with the right order:

       gcc -L./ -o bug.exe bug.c -lwlanapi

gives exactly the same results:

       -undefined reference to `WlanSetProfile@32'
       when WlanSetProfile is prototyped with __stdcall"

I think you've hit a genuine bug in older versions of ld here.  Try moving
the dll Wlanapi.dll  out of library search path.  Alternatively rename
wlanapi.lib to libwlanapi.a 

Older versions of ld acted as if  *.lib suffix was only used for static
libs, and ignored it in preference to a shared lib named *.dll.  The dll
itself however only exports aliased names (without the "@n" suffix) so you
really do need the import lib, wlanapi.lib

Danny

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Comment By: jkarretero (jkarretero_)
Date: 2007-12-17 19:36

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Hi earnie!

You are rigth, command line was in the wrong order.

But compiling with the right order:

       gcc -L./ -o bug.exe bug.c -lwlanapi

gives exactly the same results:

       -undefined reference to `WlanSetProfile@32'
       when WlanSetProfile is prototyped with __stdcall

       -result=87
       .i=4206603
       ...
       when WlanSetProfile is prototyped with __cdecl

So the bug isn't fixed.

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Comment By: Earnie Boyd (earnie)
Date: 2007-12-14 20:58

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You have the command wrong.  See
http://www.mingw.org/MinGWiki/index.php/FAQ and the "Compiling" section.

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Comment By: jkarretero (jkarretero_)
Date: 2007-12-14 18:56

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Hi Dannysmith!

I think you are not right, because if I use the following prototype:

unsigned long __stdcall WlanSetProfile
(
	void* hClientHandle, const GUID *pInterfaceGuid,
	unsigned long dwFlags, const unsigned short* strProfileXml,
	const unsigned short* strAllUserProfileSecurity,
	long bOverwrite, void* pReserved, unsigned long *pdwReasonCode
);

I get the following linking error:

C:\DOCUME~1\CARRET~1\LOCALS~1\Temp/ccE7aaaa.o:bug.c:(.text+0x54):
undefined reference to `WlanSetProfile@32'
collect2: ld returned 1 exit status

Can you succesfully compile bug.c adding __stdcall to the prototype?

I have try compiling bug.c this way:
gcc -Wl,--add-stdcall-alias -L./ -lwlanapi bug.c -o bug.exe
but it still returns the same error.

Thanks.

Jesus.

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Comment By: Danny Smith (dannysmith)
Date: 2007-12-13 09:20

Message:
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user_id=11494
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The bug is in your prototype:
unsigned long WlanSetProfile
(
	void* hClientHandle, const GUID *pInterfaceGuid,
	unsigned long dwFlags, const unsigned short* strProfileXml,
	const unsigned short* strAllUserProfileSecurity,
	long bOverwrite, void* pReserved, unsigned long *pdwReasonCode
);

It should be:
 unsigned long /* WINAPI*/ __stdcall WlanSetProfile ...

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