[Mingw-notify] [ mingw-Bugs-1901008 ] LD generates a non syntax valid definition file

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Bugs item #1901008, was opened at 2008-02-25 09:49
Message generated for change (Comment added) made by dannysmith
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>Category: binutils
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: jkarretero (jkarretero_)
>Assigned to: Danny Smith (dannysmith)
Summary: LD generates a non syntax valid definition file

Initial Comment:
Option --output-def of LD generates a non syntax valid definition file.

Using:
Windows XP SP2
mingw-runtime-3.14
binutils-2.18.50-20080109
gcc-core-3.4.5-20060117-1
w32api-3.11

Steps to reproduce the bug:

We want to generate a dll with functions in function.c, and export its definition file.

1. Compile function.c. This function uses WlanReasonCodeToString in wlanapi.dll.
       gcc -c -Wall function.c -o function.o

2. Generate the dll and its definition file (if you don't have
wlanapi.dll, you can use one of the wlanapi folder)
       ld -L./ -shared -o library.dll --output-def bad_syntax.def function.o -lwlanapi

The generated DEF file may be used as a reference to automatically or
implicitly exported symbols.
In step 3 we are going to use the DEF file in this mentioned way. So
we could check its syntax.

3. Create the dll using DEF file to indicate what symbols will be exported.
       ld -L./ -shared -o library.dll bad_syntax.def function.o -lwlanapi

Ld gives the following error in step 3:

ld: bad_syntax.def:2: syntax error
ld:bad_syntax.def: file format not recognized; treating as linker script
ld:bad_syntax.def:2: syntax error

As we can see, --output-def of LD has generated a non syntax valid definition file.

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>Comment By: Danny Smith (dannysmith)
Date: 2008-06-16 15:08

Message:
Logged In: YES 
user_id=11494
Originator: NO

Hi,
I see the problem.  GNU ld does not treat the ILF (short format) MS import
lib  wlanapi.lib as an archive, as it does  for the long format import libs
that mingw and cygwin use.

If you create an import lib  for wlanapi.dll using dlltool, and use that
implib, it will create a good def file and dll.

I will investigate further.

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