Makefile: Support out-of-tree builds.

The `distcheck' target shows how you can do this, though it's rather
cumbersome.

diff --git a/Makefile b/Makefile
index f1395ff..b77af1d 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -23,9 +23,11 @@
 ### with preload-hacks; if not, write to the Free Software Foundation, Inc.,
 ### 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
+srcdir                  = .
 PACKAGE                         = preload-hacks
-VERSION                        := $(shell ./auto-version)
+VERSION                        := $(shell cd $(srcdir) && ./auto-version)
 
+VPATH                   = $(srcdir)
 .SECONDEXPANSION: #sorry
 
 ###--------------------------------------------------------------------------
@@ -63,6 +65,9 @@ MKDIRS                         = $(INSTALL) -d -m755
 REAL_CFLAGS             = $(CFLAGS) -fPIC -MD
 REAL_LDFLAGS            = $(LDFLAGS) -shared
 
+## Allow user overrides for this stuff.
+-include config.mk
+
 ###--------------------------------------------------------------------------
 ### Quiet building.
 
@@ -149,7 +154,7 @@ $(addsuffix .so,$(HACKS)): %.so: $$(patsubst %.c,%.o,$$($$*_SOURCES))
 
 ## Constructing the scripts.
 $(SCRIPTS): %: withlib.in
-       $(call v_tag,GEN)sed "s/@lib@/$@/" withlib.in >$@.new && \
+       $(call v_tag,GEN)sed "s/@lib@/$@/" $(srcdir)/withlib.in >$@.new && \
                chmod +x $@.new && mv $@.new $@
 
 -include $(patsubst %.c,%d,$(ALL_SOURCES))
@@ -163,7 +168,7 @@ install: all
        $(MKDIRS) $(DESTDIR)$(libdir)
        $(INST_BIN) $(LIBS) $(DESTDIR)$(libdir)
        $(MKDIRS) $(DESTDIR)$(man1dir)
-       $(INST_MAN) $(MAN1) $(DESTDIR)$(man1dir)
+       $(INST_MAN) $(addprefix $(srcdir)/,$(MAN1)) $(DESTDIR)$(man1dir)
 .PHONY: install
 
 uninstall:
@@ -185,7 +190,7 @@ distdir:
              d=$${i%/*} && $(MKDIRS) $(distdir)/$$d || exit 1 \
              ;; \
          esac; \
-         cp $$i $(distdir)/$$i || exit 1; \
+         cp $(srcdir)/$$i $(distdir)/$$i || exit 1; \
        done
 .PHONY: distdir
 
@@ -199,10 +204,11 @@ distcheck: dist
        mkdir _distcheck
        +cd _distcheck && \
        tar xvfz ../$(DISTTAR) && \
-       cd $(distdir) && \
-       make && \
-       make install DESTDIR=../_install && \
-       make dist
+       mkdir _build && cd _build && \
+       make -f../$(distdir)/Makefile srcdir=../$(distdir) && \
+       make -f../$(distdir)/Makefile srcdir=../$(distdir) \
+               install DESTDIR=../_install && \
+       make -f../$(distdir)/Makefile srcdir=../$(distdir) dist
        rm -rf _distcheck
 
 ###----- That's all, folks --------------------------------------------------