Re: ./configure does not check libpng correctly in recent cygwin. (cvs source 2010-08-14)

[Tatsuro M. <tma...@ya...>]

Sorry 

A correction:
> Now in the latest cygwin, libpng is removed and only libpng12 exist.

->

Now in the latest cygwin, libpng.a and libpng.a are removed and only libpng12.dll.a and libpng12.a
exist in /usr/lib.

Tatsuro

--- Tatsuro MATSUOKA  wrote:

> Hello
> 
> I have found that during in the 'make pdffigures'.
> 
> ../src/gnuplot plotstyles.gnu
> "plotstyles.gnu", line 327: This copy of gnuplot cannot read png/gif/jpeg images
> 
> make: *** [figures] Error 1
> 
> I have checked config.h and config.log.
> 
> I found in config.h
> 
> /* Define if libgd supports png. */
> /* #undef HAVE_GD_PNG */
> 
> and found in config.log
> 
> configure:8811: checking for gdImageStringFT in -lgd
> configure:8836: gcc -shared-libgcc -o conftest.exe -O3 -fomit-frame-pointer  
> -I/usr/local/include 
> -L/usr/lib conftest.c -lgd   -lXpm -lX11 -ljpeg -lfontconfig -lfreetype -lpng12 -lz -liconv
> -ljpeg
> -lfreetype >&5
> configure:8836: $? = 0
> configure:8845: result: yes
> configure:8904: checking for gdImagePng in -lgd
> configure:8929: gcc -shared-libgcc -o conftest.exe -O3 -fomit-frame-pointer  
> -I/usr/local/include 
> -L/usr/lib conftest.c -lgd   -lXpm -lX11 -ljpeg -lfontconfig -lfreetype -lpng12 -lz -liconv
> -ljpeg
> -lfreetype -lpng >&5
> /usr/lib/gcc/i686-pc-cygwin/4.3.4/../../../../i686-pc-cygwin/bin/ld: cannot find -lpng
> collect2: ld returned 1 exit status
> configure:8929: $? = 1
> 
> Now in the latest cygwin, libpng is removed and only libpng12 exist.
> Perhaps the second test effective and png was not effective thus  resulted in 
> 
> /* Define if libgd supports png. */
> /* #undef HAVE_GD_PNG */
> 
> in config.h.
> 
> If the first check is OK and then second check should be skipped.
> 
> Temporally I have made a symbolic link to avoid the detection failure of the libpng.  
>  ln -s libpng12.dll.a libpng.dll.a
> 
> Regards
> 
> Tatsuro
> 
> 
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