[fltk.bugs] [MOD] STR #2833: fltk-3 tries to compile local PNG lib even if system lib is selected

[Ian MacArthur]

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[STR New]

Link: http://www.fltk.org/str.php?L2833
Version: 3.0


Fltk-3 attempts to build the local PNG files even if configure selects the
system PNG libs instead.

However, this usually fails, since the local PNG lib is newer than most
distros (including OSX) are currently shipping, and since the system
header files are found before the local PNG header files, version
mis-match occurs.

I have seen this fail on OSX and Linux (and maybe mingw too, not certain)
and appears to be a "feature" of the restructured build hierarchy,
perhaps.

Anyway, here's a snapshot from OSX (though other hosts are similar...)

First, see that we configure with the SYSTEM image libs:

Configuration Summary
-------------------------------------------------------------------------
    Directories: prefix=/usr/local
                 bindir=${exec_prefix}/bin
                 datadir=${datarootdir}
                 datarootdir=${prefix}/share
                 exec_prefix=${prefix}
                 includedir=${prefix}/include
                 libdir=${exec_prefix}/lib
                 mandir=${datarootdir}/man
       Graphics: Quartz
Image Libraries: JPEG=System
                 PNG=System
                 ZLIB=System
    Large Files: YES
         OpenGL: YES
        Threads: YES
configure: creating ./config.status
config.status: creating makeinclude
config.status: creating fltk.list
config.status: creating fltk3-config
config.status: creating fltk.spec
config.status: creating include/fltk3/Makefile
config.status: creating include/config.h


Now note that during the build, we attempt to build libpng anyway, but it
fails since the system headers do not match the local png source files...


Compiling fltk3images/PNMImage.cxx...
/usr/bin/ar cr ../lib/libfltk3images.a ...
Compiling fltk3png/png.c...
fltk3png/png.c:14:21: error: pngpriv.h: No such file or directory
fltk3png/png.c:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘Your_png_h_is_not_version_1_5_10’
fltk3png/png.c:559: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘PNGAPI’
fltk3png/png.c:649: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘PNGAPI’
fltk3png/png.c:680: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘PNGAPI’
fltk3png/png.c:687: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘PNGAPI’
fltk3png/png.c:695: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘PNGAPI’
fltk3png/png.c:762: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘PNGAPI’
make[1]: *** [fltk3png/png.o] Error 1
make: *** [all] Error 1
immpcx:fltk-3-syslibs ian$


Link: http://www.fltk.org/str.php?L2833
Version: 3.0


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