Thanks for the feedback, Lars. I start to see a little light in the darkness.
I'm going to try and explain what I think I need to see if I understand it
myself. I'd be very grateful if you could look through this and correct me.
Angus
I see that if I added a test to configure.in:
### check whether to use the image loading facilities of the xforms
### library.
if test x$lyx_use_frontend = xxforms; then
LYX_CHECK_DECL(flimage_dup, $lyx_cv_forms_h_location)
fi
then this would result in a variable in config.h HAVE_DECL_FLIMAGE_DUP
How does AC_CHECK_FUNCS(flimage_dup) work? How does it know what files to
check?
Anyway, this simple test would be fine if the only place I needed the check
was inside a .C file, but in this case I want to test whether to compile the
.C file at all, so the test must result in a modification of a couple of
Makefile.ams.
So, I can put the following test in configure.in or wrap it up in
LYX_USE_XFORMS_GUI_LOADER and shove it in lyxinclude.m4. What do you prefer?
### check whether to use the image loading facilities of the xforms
### library.
if test x$lyx_use_frontend = xxforms; then
LYX_CHECK_DECL(flimage_dup, $lyx_cv_forms_h_location)
LYX_CHECK_DECL(flimage_to_pixmap, $lyx_cv_forms_h_location)
if test x$lyx_cv_declare_forms_h_flimage_dup = xyes -a
x$lyx_cv_declare_forms_h_flimage_to_pixmap = xyes; then
lyx_use_xforms_image_loader=yes
else
lyx_use_xforms_image_loader=no
fi
AM_CONDITIONAL(USE_XFORMS_IMAGE_LOADER,
test x$lyx_use_xforms_image_loader = xyes)
if test x$lyx_use_xforms_image_loader = xyes; then
LYX_CHECK_DECL(flimage_enable_ps, $lyx_cv_forms_h_location)
fi
fi
This will result in variables in config.h
#define HAVE_DECL_FLIMAGE_DUP 1
#define HAVE_DECL_FLIMAGE_TO_PIXMAP 1
#define HAVE_DECL_FLIMAGE_ENABLE_PS 1
and means that I can also modify graphics/Makefile.am and
frontends/xforms/Makefile.am so:
EXTRA_DIST = GraphicsImageXPM.C GraphicsImageXPM.h
if !USE_XFORMS_IMAGE_LOADER
GRAPHICSIMAGEXPM = GraphicsImageXPM.C GraphicsImageXPM.h
endif
libgraphics_la_SOURCES = \
... \
$(GRAPHICSIMAGEXPM) GraphicsParams.C \
...
So one more question. Is
if !USE_XFORMS_IMAGE_LOADER
valid syntax in Makefile.am
