mi...@gnu.org wrote:
> Jef Driesen writes:
>> Isn't it easier to just check for the presence of the header file and/or
>> the library file, avoiding pkg-config entirely?
>
> Well, I'd prefer not to guess when possible, and not using pkg-config
> for a package that wants you to use it means you end up guessing at the
> proper locations/settings. Maybe this often works, but why risk it when
> it's not necessary?
I'm aware of the advantage of using pkg-config. I even supply the *.pc files
for my own projects. But the point is that if I want to support systems that
don't have pkg-config installed (like Mac OS X in my case), I have to provide a
fallback with manual detection anyway. So why not skip pkg-config entirely?
Most libraries have only very standard stuff in there pkg-config file, like
this:
Libs: -L${libdir} -lusb-1.0
Cflags: -I${includedir}/libusb-1.0
And I could simply replace the pkg-config based check with something like:
AC_CHECK_HEADER([libusb-1.0/libusb.h],
AC_CHECK_LIB([usb-1.0], [libusb_init],
[have_libusb=yes],
[have_libusb=no]),
[have_libusb=no])
if test "$have_libusb" = "yes"; then
AC_DEFINE([HAVE_LIBUSB], [1], [Define if you have the libusb library and
header])
AC_SUBST([LIBUSB_CFLAGS], [])
AC_SUBST([LIBUSB_LIBS], [-lusb-1.0])
fi
Jef
