2013.11.11 09:09 "Re: [Tiff] trouble linking libtiff with msvc++ 2012", by Schmeißer, _Martin

What worked was to include Qt's version of libtiff in the qmake file. This way, all's built with the same compiler parameters and works fine.

Von: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.org] Im Auftrag von Schmeißer, Martin Gesendet: Dienstag, 8. Oktober 2013 15:06

An: tiff@lists.maptools.org

Betreff: [Tiff] trouble linking libtiff with msvc++ 2012

Dear libtiff users,

May I solicit some help regarding the linking of libtiff:
I am trying to link libtiff to a c++ project using Qt and the compiler from Visual Studio 2012, 64bit. Libtiff compiled just fine using the supplied makefile.vc

The compiler and linker arguments in the makefile (qmake generated) are

    INCPATH       = -I"..\tiff-4.0.3\libtiff" -I"..\tiff-4.0.3\port"
    LINKER        = link
    LFLAGS        = /NOLOGO /DYNAMICBASE /NXCOMPAT /INCREMENTAL:NO /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='*' processorArchitecture='*'"
    LIBS          = qtmain.lib ..\tiff-4.0.3\port\libport.lib ..\tiff-4.0.3\libtiff\libtiff.lib

yet, the linker cant resolve "TIFFOpen" "TIFFClose" "TIFFWriteScanline" "TIFFSetField" external symbols.
I can however, find the symbols in the lib file. dumpbin yields

010 00000170 SECT5 notype () External | _TIFFClose

...

008 00000000 SECT3 notype Static | ?module@?1??TIFFOpen@@9@9 (`TIFFOpen'::`2'::module)
00D 0000000C SECT3 notype Static | ?module@?1??TIFFOpenW@@9@9 (`TIFFOpenW'::`2'::module)

...

034 000000C0 SECT5 notype () External | _TIFFOpen
035 000001B0 SECT5 notype () External | _TIFFOpenW

and so on.

I am including "libtiff.h".

How does the c++ compiler find the extern "c" symbols? Is the leading underscore the problem?

thanks!
Martin

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