[PATCH] Allow INSTALL, bindir, mandir to be set in main Makefile

[Jakub Narebski <jnareb@gmail.com>]

Makefiles in subdirectories now use existing value of INSTALL, bindir,
mandir if it is set, allowing those to be set in main Makefile or in
config.mak.  Main Makefile exports variables which it sets.

Renames man1 and man7 variables to man1dir and man7dir, according to
"Makefile Conventions: Variables for Installation Directories" in
make.info of GNU Make.  Renames bin to bindir (unused, perhaps to be
removed).

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
Part of autoconf series, but independent.

Should probably be split into two patches:
 * first with export + '?='
 * second renaming man1 and man7 to man1dir and man7dir

 Documentation/Makefile   |   14 +++++++-------
 Makefile                 |    2 ++
 contrib/emacs/Makefile   |    4 ++--
 contrib/git-svn/Makefile |    8 ++++----
 4 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 2b0efe7..cc83610 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -25,10 +25,10 @@ DOC_MAN1=$(patsubst %.txt,%.1,$(MAN1_TXT
 DOC_MAN7=$(patsubst %.txt,%.7,$(MAN7_TXT))
 
 prefix?=$(HOME)
-bin=$(prefix)/bin
-mandir=$(prefix)/man
-man1=$(mandir)/man1
-man7=$(mandir)/man7
+bindir?=$(prefix)/bin
+mandir?=$(prefix)/man
+man1dir=$(mandir)/man1
+man7dir=$(mandir)/man7
 # DESTDIR=
 
 INSTALL?=install
@@ -52,9 +52,9 @@ man1: $(DOC_MAN1)
 man7: $(DOC_MAN7)
 
 install: man
-	$(INSTALL) -d -m755 $(DESTDIR)$(man1) $(DESTDIR)$(man7)
-	$(INSTALL) $(DOC_MAN1) $(DESTDIR)$(man1)
-	$(INSTALL) $(DOC_MAN7) $(DESTDIR)$(man7)
+	$(INSTALL) -d -m755 $(DESTDIR)$(man1dir) $(DESTDIR)$(man7dir)
+	$(INSTALL) $(DOC_MAN1) $(DESTDIR)$(man1dir)
+	$(INSTALL) $(DOC_MAN7) $(DESTDIR)$(man7dir)
 
 
 #
diff --git a/Makefile b/Makefile
index cde619c..b8fe669 100644
--- a/Makefile
+++ b/Makefile
@@ -100,6 +100,8 @@ template_dir = $(prefix)/share/git-core/
 GIT_PYTHON_DIR = $(prefix)/share/git-core/python
 # DESTDIR=
 
+export prefix bindir gitexecdir template_dir GIT_PYTHON_DIR
+
 CC = gcc
 AR = ar
 TAR = tar
diff --git a/contrib/emacs/Makefile b/contrib/emacs/Makefile
index d3619db..350846d 100644
--- a/contrib/emacs/Makefile
+++ b/contrib/emacs/Makefile
@@ -3,9 +3,9 @@ ## Build and install stuff
 EMACS = emacs
 
 ELC = git.elc vc-git.elc
-INSTALL = install
+INSTALL ?= install
 INSTALL_ELC = $(INSTALL) -m 644
-prefix = $(HOME)
+prefix ?= $(HOME)
 emacsdir = $(prefix)/share/emacs/site-lisp
 
 all: $(ELC)
diff --git a/contrib/git-svn/Makefile b/contrib/git-svn/Makefile
index 7c20946..8cac688 100644
--- a/contrib/git-svn/Makefile
+++ b/contrib/git-svn/Makefile
@@ -1,9 +1,9 @@
 all: git-svn
 
 prefix?=$(HOME)
-bindir=$(prefix)/bin
-mandir=$(prefix)/man
-man1=$(mandir)/man1
+bindir?=$(prefix)/bin
+mandir?=$(prefix)/man
+man1dir=$(mandir)/man1
 INSTALL?=install
 doc_conf=../../Documentation/asciidoc.conf
 -include ../../config.mak
@@ -17,7 +17,7 @@ install: all
 	$(INSTALL) git-svn $(DESTDIR)$(bindir)
 
 install-doc: doc
-	$(INSTALL) git-svn.1 $(DESTDIR)$(man1)
+	$(INSTALL) git-svn.1 $(DESTDIR)$(man1dir)
 
 doc: git-svn.1
 git-svn.1 : git-svn.xml
-- 
1.4.0