[Qemu-devel] [PATCH v2] build-sys: add make 'help' target

[Marc-André Lureau]

Add a make 'help', to print a summary of the main Makefile targets.
The format is loosely inspired by Linux make 'help' output.

Signed-off-by: Marc-André Lureau <address@hidden>
---
Makefile | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

v2:
 - add architectures targets
 - move generic targets on top, 'all' first
 - better describe 'docker' help target

diff --git a/Makefile b/Makefile
index 50b4b3a..03dbec2 100644
--- a/Makefile
+++ b/Makefile
@@ -669,3 +669,41 @@ endif
 -include $(wildcard *.d tests/*.d)
 
 include $(SRC_PATH)/tests/docker/Makefile.include
+
+.PHONY: help
+help:
+       @echo  'Generic targets:'
+       @echo  '  all             - Build all'
+       @echo  '  dir/file.o      - Build specified target only'
+       @echo  '  install         - Install QEMU, documentation and tools'
+       @echo  '  ctags/TAGS      - Generate tags file for editors'
+       @echo  '  cscope          - Generate cscope index'
+       @echo  ''
+       @$(if $(TARGET_DIRS), \
+               echo 'Architecture specific targets:'; \
+               $(foreach t, $(TARGET_DIRS), \
+               printf "  %-30s - Build for %s\\n" $(patsubst %,subdir-%,$(t)) 
$(t);) \
+               echo '')
+       @echo  'Cleaning targets:'
+       @echo  '  clean           - Remove most generated files but keep the 
config'
+       @echo  '  distclean       - Remove all generated files'
+       @echo  '  dist            - Build a distributable tarball'
+       @echo  ''
+       @echo  'Test targets:'
+       @echo  '  check           - Run all tests (check-help for details)'
+       @echo  '  docker          - Help about targets running tests inside 
Docker containers'
+       @echo  '  test/speed      - Run TCG tests'
+       @echo  ''
+       @echo  'Documentation targets:'
+       @echo  '  dvi/html/'
+       @echo  '  info/pdf        - Build documentation in specified format'
+       @echo  ''
+ifdef CONFIG_WIN32
+       @echo  'Windows targets:'
+       @echo  '  installer       - Build NSIS-based installer for qemu-ga'
+ifdef QEMU_GA_MSI_ENABLED
+       @echo  '  msi             - Build MSI-based installer for qemu-ga'
+endif
+       @echo  ''
+endif
+       @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose 
build'
-- 
2.10.0