Add support for 'make help' in subdirectories

[ghc-hetmet.git] / mk / sub-makefile.mk

diff --git a/mk/sub-makefile.mk b/mk/sub-makefile.mk
index a1d1e9b..989c0c9 100644 (file)
--- a/mk/sub-makefile.mk
+++ b/mk/sub-makefile.mk
@@ -30,7 +30,16 @@ STD_TARGETS = all clean distclean maintainer_clean install html ps pdf
 $(STD_TARGETS): 
        +$(TOPMAKE) $@_$(dir)
 
-OTHERTARGETS=$(filter-out fast $(STD_TARGETS) $(SPEC_TARGETS),$(MAKECMDGOALS))
+OTHERTARGETS=$(filter-out fast help $(STD_TARGETS) $(SPEC_TARGETS),$(MAKECMDGOALS))
 .PHONY: $(OTHERTARGETS)
 $(OTHERTARGETS):
        +$(TOPMAKE) $(dir)/$@
+
+.PHONY: help
+help : sub-help
+
+.PHONY: sub-help
+sub-help :
+       @echo "You are in subdirectory \"$(dir)\"."
+       @echo "Useful targets in this directory:"
+       @cat $(TOP)/SUBMAKEHELP