Add support for VPATH builds in contrib/minizip.

Instead of using relative paths directly, use paths relative to
top_srcdir and top_builddir to refer to source files and built files,
respectively.

Note that the toplevel zlib configure script still does not have any
special support for out-of-tree builds.  But now you can do

	(cd contrib/minizip && autoreconf -fis)

	mkdir -p BUILD/test
	cp *.c *.h *.in zlib.map configure zlib.3 BUILD
	cp test/*.c BUILD/test
	(cd BUILD && ./configure --shared)
	(cd BUILD && make)

	mkdir -p BUILD/contrib/minizip
	cd BUILD/contrib/minizip
	../../../contrib/minizip/configure
	make

While at it, move the include path and library path settings to
CPPFLAGS and LDFLAGS respectively instead of setting both in CFLAGS.
Thanks to Mike Frysinger for advice.

1 files changed, 7 insertions, 2 deletions

diff --git a/contrib/minizip/Makefile.am b/contrib/minizip/Makefile.am
index 91258db..b0f39b6 100644
--- a/contrib/minizip/Makefile.am
+++ b/contrib/minizip/Makefile.am
@@ -1,13 +1,18 @@
 lib_LTLIBRARIES = libminizip.la
 
+zlib_top_srcdir = $(top_srcdir)/../..
+zlib_top_builddir = $(top_builddir)/../..
+
+AM_CPPFLAGS = -I$(zlib_top_srcdir)
+AM_LDFLAGS = -L$(zlib_top_builddir)
+
 libminizip_la_SOURCES = \
         ioapi.c \
         mztools.c \
         unzip.c \
         zip.c
 
-AM_CFLAGS = -I../.. -L../..
-libminizip_la_LDFLAGS = -version-info 1:0:0 -lz
+libminizip_la_LDFLAGS = $(AM_LDFLAGS) -version-info 1:0:0 -lz
 
 minizip_includedir = $(includedir)/minizip
 minizip_include_HEADERS = \