# binaries_expand_loadlibes.mk
# $Id: binaries_expand_loadlibes.mk,v 1.6 1999/08/26 20:43:29 russo Exp $
#
# This is a subroutine of binaries.mk.
#
# Make has a feature in that given a dependency like `-lX', it will
# automatically search for a file like `libX.a'.  This is convenient,
# but it doesn't go far enough -- sometimes a library is supplied
# only as a dso, with extension .so or some such.  The library search
# behavior in make won't find this.
#
# It would be nice to have make be able to find such files directly.
# (And probably not very difficult; cf. library_search() in remake.c.)
# But we probably shouldn't rely on such a change until it's widespread.
# So i'm going to do the expansion myself.
#
# This builds LOADLIBES_DEP from LOADLIBES.  Fasten seatbelts!
#
# scott snyder, jan 1999; adapted from d0_util.
#

#
# First, construct a list of paths to search for libraries.
# Use the list of paths in LDFLAGS, and add /usr/lib and /lib.
#
LOADLIBES_PATH := $(patsubst -L%,%,$(filter -L%,$(LDFLAGS))) /usr/lib /lib

#
# The expander.
# Pick the first of
#  - A libX.a file on the path.
#  - A libX.so file on the path.
#  - The unexpanded name.
#
expand_libe = $(firstword $(strip\
                $(wildcard $(addsuffix\
                              $(firstword\
                                  $(patsubst -l%,/lib%.a,$(filter -l%,$(l)))\
                                  _xyzzy),\
                              $(LOADLIBES_PATH)))\
                $(wildcard $(addsuffix\
                              $(firstword\
                                  $(patsubst -l%,/lib%.so,$(filter -l%,$(l)))\
                                  _xyzzy),\
                              $(LOADLIBES_PATH)))\
                $(l)))

#
# Run all elements of LOADLIBES through the expansion.
# Remove NT-style .lib libraries from the list.
#
LOADLIBES_DEP := $(foreach l,$(filter-out %.lib,$(LOADLIBES)),$(expand_libe))