> > This used to work correctly, AFAICT, under mingw (and I think cygwin
> > too) so I suspect we have broken something. However, as you note, it
> > *seems* to be fine on Linux and OSX, so my be some
> interaction with the
> > configure tools on win32?
> No I don't think it worked correctly before too because as I
> said, the libjpeg has the same problem here when in auto
> mode, meaning that auto mode leads to system lib even when no
> system lib is present.
> And we didn't change the libjpeg code from a iota ...
Odd - that is not what I find. On this box, if I "move aside" my system
jpeg libs and then configure like this, so that we should "auto-detect"
the built-in jpeg lib:
$ ./configure --enable-threads CPPFLAGS=-I/usr/local/include
LDFLAGS=-L/usr/local/lib --disable-localpng
Then I get this result:
Configuration Summary
------------------------------------------------------------------------
-
Directories: prefix=/usr/local
bindir=${exec_prefix}/bin
datadir=${prefix}/share
datarootdir=
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib
mandir=${prefix}/man
Graphics: GDI
Image Libraries: JPEG=Builtin
PNG=System
ZLIB=System
Large Files: YES
OpenGL: YES
Threads: YES
Which *has* correctly selected the built-in libjpeg...
And fltk-config returns:
$ ./fltk-config --use-images --ldflags
-L./lib -mwindows -L/usr/local/lib -mno-cygwin -lfltk_images -lpng -lz
-lfltk_jpeg -lfltk -lole32 -luuid -lcomctl32
Which again seems to be using the built-in lib. (And the built-in
libjpeg dies get built when I make the fltk library, too.)
So, at least in this case, it seems that configure has done the correct
thing, on this mingw setup.
(Of course, as Albrecht points out, the whole cygwin thing is
potentially *much* more complicated... That's part of why I don't use
cygwin any more!)
> It will only fix PNG lib to demonstrate the principle of the
> changed configure.in code, then it will apply to libjpeg and libz.
>
> Any thoughts ?
Sounds like a good idea.
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