On Tue, 19 Mar 2002, Johnny C. Lam wrote:

> On Sun, Mar 17, 2002 at 10:43:16AM -0500, mcmahill@mtl.mit.edu wrote:
> > 
> > are there any examples of how to create buildlink.mk files for packages
> > which use devel/pkgconfig (sort of a universal gtk-config type program).
> 
> Can you give some examples of packages in our tree that use pkg-config?
> I'd like to study how it's invoked so I can help devise a buildlink.mk
> solution.

i'm not sure of any, but 4 packages I'm working on importing soon do....
graphics/imlib and graphics/gphoto2 both install .pc files, but it looks
like they don't do anything with them.

pkg-config works pretty much like the usual gtk-config, glib-config, etc.
The primary difference is there is a directory, /usr/pkg/lib/pkgconfig/,
where .pc files live.  One per package.  So where you used to type

  gtk-config --cflags
  glib-config --libs

you now type

  pkg-config --cflags gtk-2.0
  pkg-config --libs glib-2.0

there are a few other args that can check for the existance of programs.

The .pc files look like:

mudshark# more /usr/pkg/lib/pkgconfig/glib-2.0.pc 
prefix=/usr/pkg
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=/usr/pkg/include/glib

glib_genmarshal=glib-genmarshal
gobject_query=gobject-query
glib_mkenums=glib-mkenums

Name: GLib
Description: C Utility Library
Version: 2.0.0
Libs: -L${libdir} -R${libdir} -lglib-2.0 -lintl -liconv
Cflags: -I${includedir}/glib-2.0 -I${libdir}/glib-2.0/include 


My first attempt at doing something for this is:

RCS file: /cvsroot/pkgsrc/mk/bsd.buildlink.mk,v
retrieving revision 1.55
diff -u -2 -r1.55 bsd.buildlink.mk
--- bsd.buildlink.mk    2002/02/26 22:24:00     1.55
+++ bsd.buildlink.mk    2002/03/20 01:22:43
@@ -185,10 +185,37 @@
 .if defined(USE_BUILDLINK_ONLY)
 USE_CONFIG_WRAPPER=    # defined
+BUILDLINK_PKG_CONFIG=  ${BUILDLINK_DIR}/bin/pkg-config
+CONFIGURE_ENV+=                PKG_CONFIG="${BUILDLINK_PKG_CONFIG}"
+MAKE_ENV+=             PKG_CONFIG="${BUILDLINK_PKG_CONFIG}"
 .endif
 
+BUILDLINK_PKG_CONFIG_SED?=             # empty
+_BUILDLINK_PKG_CONFIG_POST_SED+=                                       \
+       -e "s|-I${LOCALBASE}/|-I${BUILDLINK_DIR}/|g"                    \
+       -e "s|-L${LOCALBASE}/|-L${BUILDLINK_DIR}/|g"                    \
+       -e "s|-I${X11PREFIX}/|-I${BUILDLINK_DIR}/|g"                    \
+       -e "s|-L${X11PREFIX}/|-L${BUILDLINK_DIR}/|g"
+
+${BUILDLINK_PKG_CONFIG}: 
+       ${_PKG_SILENT}${_PKG_DEBUG}                             \
+       ${ECHO_BUILDLINK_MSG} "Creating pkg-config wrapper
${BUILDLINK_PKG_CONFIG}"; \
+       ${MKDIR} ${BUILDLINK_PKG_CONFIG:S/pkg-config//};        \
+       (${ECHO} '#!/bin/sh';                                   \
+       ${ECHO} '';                                             \
+       ${ECHO} 'pc=`${LOCALBASE}/bin/pkg-config $$*`';         \
+       ${ECHO} 'rslt=$$?';                                     \
+       ${ECHO} '${ECHO} "$$pc" | ${SED} \';                    \
+       ${ECHO} '       ${BUILDLINK_PKG_CONFIG_SED} \';         \
+       ${ECHO} '       ${_BUILDLINK_PKG_CONFIG_POST_SED}';     \
+       ${ECHO} 'exit $$rslt';                                  \
+       ) > ${BUILDLINK_PKG_CONFIG} ;                           \
+       ${CHMOD} +x ${BUILDLINK_PKG_CONFIG}; 
+
 BUILDLINK_CONFIG_WRAPPER_SED?=         # empty
 _BUILDLINK_CONFIG_WRAPPER_POST_SED+=                                   \
        -e "s|-I${LOCALBASE}/|-I${BUILDLINK_DIR}/|g"                    \
-       -e "s|-L${LOCALBASE}/|-L${BUILDLINK_DIR}/|g"
+       -e "s|-L${LOCALBASE}/|-L${BUILDLINK_DIR}/|g"                    \
+       -e "s|-I${X11PREFIX}/|-I${BUILDLINK_DIR}/|g"                    \
+       -e "s|-L${X11PREFIX}/|-L${BUILDLINK_DIR}/|g"
 
 _BUILDLINK_CONFIG_WRAPPER_USE: .USE


then in, for example devel/glib2/buildlink.mk, I added:

BUILDLINK_TARGETS+=             ${BUILDLINK_PKG_CONFIG}


The idea is just to create a wrapper around pkg-config.  Have to be a bit
careful about return values as pkg-config's return value does mean
something.  

Comments?  Maybe I should put this instead in a
devel/pkgconfig/buildlink.mk file?  Maybe we need a USE_PKG_CONFIG
variable?

This is one of the 2 things left before I import glib/gtk-2.

-Dan