[PATCH] Makefile: Add help target

[Stephen Boyd <bebarino@gmail.com>]

Today I forgot whether the target was quick-install-doc or
install-quick-doc and had to open the Makefile again to find out. I'd
rather not do that and just use:

	$ make help

to get a quick summary of the interesting targets when my brain fails to
refresh. Add a help target, but don't add uninteresting things like
strip, install-gitweb, or targets which alias (install-man).

Signed-off-by: Stephen Boyd <bebarino@gmail.com>
---
 Makefile |   40 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/Makefile b/Makefile
index b7a62cf..8c8fcb0 100644
--- a/Makefile
+++ b/Makefile
@@ -2366,3 +2366,43 @@ cover_db: coverage-report
 
 cover_db_html: cover_db
 	cover -report html -outputdir cover_db_html cover_db
+
+help:
+	@echo 'Cleaning targets:'
+	@echo '  clean      - Remove generated files but keep the configure script'
+	@echo '  distclean  - Remove generated files and the configure script'
+	@echo
+	@echo 'Packaging targets:'
+	@echo '  dist       - Build git-$(GIT_VERSION).tar.gz source tarball'
+	@echo '  rpm        - Build source and binary RPM packages'
+	@echo '  dist-doc   - Build $(manpages).tar.gz and $(htmldocs).tar.gz'
+	@echo
+	@echo 'Documentation targets:'
+	@echo '  doc     - Build man pages and HTML docs'
+	@echo '  man     - Build man pages'
+	@echo '  html    - Build HTML docs'
+	@echo '  info    - Build info docs'
+	@echo '  pdf     - Build PDF docs'
+	@echo
+	@echo 'Installation targets:'
+	@echo '  install             - Install the git suite'
+	@echo '  install-doc         - Install man pages'
+	@echo '  install-html        - Install HTML docs'
+	@echo '  install-info        - Install info docs'
+	@echo '  install-pdf         - Install PDF docs'
+	@echo '  quick-install-doc   - Install pregenerated man pages from origin/man'
+	@echo '  quick-install-html  - Install pregenerated HTML pages from origin/html'
+	@echo
+	@echo 'Common targets:'
+	@echo '  all            - Build the git suite'
+	@echo '  test           - Run the git test suite'
+	@echo
+	@echo 'Other targets:'
+	@echo '  tags/TAGS      - Generate tags for editors'
+	@echo '  cscope         - Generate cscope index'
+	@echo '  coverage       - Build git with gcov support and run the test suite'
+	@echo '  cover_db_html  - Generate HTML coverage report of the test suite coverage'
+	@echo '  check          - Check C sources with sparse'
+	@echo
+	@echo '  make V=1 [targets] verbose build'
+	@echo
-- 
1.7.3.16.g5d4d9