handy makefile script

I frequently find myself looking for default make rules, and inevitably how to print their values.  Here's a script to help.

Adapted from https://blog.melski.net/2010/11/30/makefile-hacks-print-the-value-of-any-variable/

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$ cat ~/bin/make-vars #!/bin/bash   _vars= for v in $@; do   _vars="${_vars} print-${v}" done   make -f- ${_vars} <<'EOF' print-%:     @echo '$*=$($*)'     @echo '  origin = $(origin $*)'     @echo '  flavor = $(flavor $*)'     @echo '   value = $(value  $*)' EOF

Here it is in use

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$ make-vars LINK.cc LINK.cc=c++      origin = default   flavor = recursive    value = $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)