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Date: Sat, 31 May 2008 12:29:03 -0500
From: "C S" <usmgoldeneagle AT gmail DOT com>
To: cygwin <cygwin AT cygwin DOT com>
Subject: Re: Cygwin - linker errors - __assert, __itob and __ftol
In-Reply-To: <484135CE.30E20C20@dessent.net>
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thanks for the tip Brian. i thought that i had tried to -mno-cygwin
option before but maybe i did not. i have a script file set up now
with that command option:

$g++ -mno-cygwin -D__int64="long long" -shared -I
"C:\Apps\Java\jdk1.6.0_05\include" -I
"C:\Apps\Java\jdk1.6.0_05\include\win32" -I "C:\Users\usmsci\My
Documents\shapefiles\shapelib-1.2.10\shapelib-1.2.10" -I
"C:\Users\usmsci\My Documents\shapefiles\shapelib128_bin_win" -L
"C:\Users\usmsci\My Documents\shapefiles\shapelib128_bin_win"
com_radiancetech_dss_DataGathererShapeFileReader_DataGathererShapeFileReader.cpp
-o libShapeData.dll "C:\Users\usmsci\My
Documents\shapefiles\shapelib128_bin_win\shpopen.obj"
"C:\Users\usmsci\My
Documents\shapefiles\shapelib128_bin_win\dbfopen.obj"

errors i get now are:

Warning: .drectve '-defaultlib:LIBC' - unrecognized
Warning: .drectve '-defaultlib:OLDNAMES' - unrecognized
Warning: .drectve '-defaultlib:LIBC' - unrecognized
Warning: .drectve '-defaultlib:OLDNAMES' - unrecognized

fu000001.o:(.idata$2+0xc): undefined reference to '_libmsvcrt_a_iname'
fu000004.o:(.idata$2+0xc): undefined reference to '_libmsvcrt_a_iname'

undefined reference to '__nm___itob'
Info: resolving __itob by linking to __imp___itob(auto_import)

is there possibly another option that i need to add to the command
line? thanks again for the help...!!

chad




On Sat, May 31, 2008 at 6:26 AM, Brian Dessent <brian AT dessent DOT net> wrote:
> C S wrote:
>
>> gcc -D__int64="long long" -shared -I\C:\Apps\Java\jdk1.6.0_05\include
>> -I\C:\Apps\Java\jdk1.6.0_05\include\win32 -I\c:\Users\usmsci\My
>> Documents\shapefiles\shapelib128_bin_win -L\c:\Users\usmsci\My
>> Documents\shapefiles\shapelib128_bin_win myFile.cpp -o
>> libShapeData.dll c:\Users\usmsci\My
>> Documents\shapefiles\shapelib128_bin_win\shpopen.obj
>> c:\Users\usmsci\My
>> Documents\shapefiles\shapelib128_bin_win\dbfopen.obj
>>
>> the errors i get are:
>>
>> Warning: .drectve '-defaultlib:LIBC' - unrecognized
>> Warning: .drectve '-defaultlib:OLDNAMES' - unrecognized
>> Warning: .drectve '-defaultlib:LIBC' - unrecognized
>> Warning: .drectve '-defaultlib:OLDNAMES' - unrecognized
>>
>> c:\Users\usmsci\My Documents\shapefiles\shapelib128_bin_win\shpopen.o:shpopen.c
>> (.text+0x1485):undefined reference to __assert
>
> You can't mix and match objects like that.  Those objects compiled by
> MSVC expect to be linked with the MSVCRT runtime, and here you're trying
> to link them against the Cygwin runtime.  That's the cause of the linker
> errors.  You can't do that.  Every object needs to be consistent in the
> runtime that it was compiled against.  So either you need to build
> everything against MSVCRT (i.e. gcc -mno-cygwin or using MSVC) or you
> need to build everything against Cygwin.  But you can't do some with one
> and some the other.
>
> Brian
>

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