Makefile: Eliminate the "make install-emacs" target.

Instead, simply byte-compile the emacs source files as part of "make"
and install them as part of "make install". The byte compilation is
made conditional on the configure script finding the emacs binary.
That way, "make; make install" will still work for someone that doesn't
have emacs installed, (which was the only reason we had made a separate
"make install-emacs" target in the first place).

Makefile.local

@@ -118,9 +118,6 @@ quiet ?= $($(shell echo $1 | sed -e s'/ .*//'))
 %.o: %.c $(global_deps)
 	$(call quiet,CC $(CFLAGS)) -c $(FINAL_CFLAGS) $< -o $@
 
-%.elc: %.el
-	$(call quiet,EMACS) --directory emacs -batch -f batch-byte-compile $<
-
 .deps/%.d: %.c $(global_deps)
 	@set -e; rm -f $@; mkdir -p $$(dirname $@) ; \
 	$(CC) -M $(CPPFLAGS) $(FINAL_CFLAGS) $< > $@.$$$$ 2>/dev/null ; \
@@ -183,12 +180,17 @@ install: all notmuch.1.gz
 	install -m0644 notmuch.1.gz $(DESTDIR)$(prefix)/share/man/man1/
 ifeq ($(MAKECMDGOALS), install)
 	@echo ""
-	@echo "Notmuch is now installed."
+	@echo "Notmuch is now installed to $(DESTDIR)$(prefix)"
+	@echo ""
+	@echo "To run notmuch from emacs, each user should add the following line to ~/.emacs:"
+	@echo ""
+	@echo "	(require 'notmuch)"
+	@echo ""
+	@echo "And should then run \"M-x notmuch\" from within emacs or run \"emacs -f notmuch\""
 	@echo ""
 	@echo "You may now want to install additional components to support using notmuch"
 	@echo "together with other software packages:"
 	@echo ""
-	@echo "	make install-emacs"
 	@echo "	make install-bash"
 	@echo "	make install-zsh"
 	@echo ""

configure

@@ -175,6 +175,15 @@ else
     emacs_lispdir='$(prefix)/share/emacs/site-lisp'
 fi
 
+printf "Checking if emacs is available... "
+if emacs --quick --batch > /dev/null 2>&1; then
+    printf "Yes.\n"
+    have_emacs=1
+else
+    printf "No (so will not byte-compile emacs code)\n"
+    have_emacs=0
+fi
+
 if [ $errors -gt 0 ]; then
     cat <<EOF
 
@@ -300,6 +309,9 @@ libdir = ${LIBDIR:=\$(prefix)/lib}
 # The directory to which emacs lisp files should be installed
 emacs_lispdir=${emacs_lispdir}
 
+# Whether there's an emacs binary available for byte-compiling
+HAVE_EMACS = ${have_emacs}
+
 # The directory to which desktop files should be installed
 desktop_dir = \$(prefix)/share/applications
 

emacs/Makefile.local

@@ -9,21 +9,21 @@ emacs_sources := \
 
 emacs_bytecode := $(subst .el,.elc,$(emacs_sources))
 
-.PHONY: emacs
+%.elc: %.el
-emacs: $(emacs_bytecode)
+	$(call quiet,EMACS) --directory emacs -batch -f batch-byte-compile $<
+
+ifeq ($(HAVE_EMACS),1)
+all: $(emacs_bytecode)
+endif
+
+install: install-emacs
 
 .PHONY: install-emacs
-install-emacs: install emacs
+install-emacs:
 	mkdir -p $(DESTDIR)/$(emacs_lispdir)
-	install -m0644 $(emacs_sources) $(emacs_bytecode) $(DESTDIR)$(emacs_lispdir)
+	install -m0644 $(emacs_sources) $(DESTDIR)$(emacs_lispdir)
-	@echo ""
+ifeq ($(HAVE_EMACS),1)
-	@echo "The notmuch emacs client is now installed."
+	install -m0644 $(emacs_bytecode) $(DESTDIR)$(emacs_lispdir)
-	@echo ""
+endif
-	@echo "To run this, each user should add the following line to the ~/.emacs file:"
-	@echo ""
-	@echo "	(require 'notmuch)"
-	@echo ""
-	@echo "And should then run \"M-x notmuch\" from within emacs or run \"emacs -f notmuch\""
-	@echo ""
 
 CLEAN := $(CLEAN) $(emacs_bytecode)