Make trick for multi-line recipes:

[Sam Liddicott]

I came up wit this cunning use of bash to remove the back-slash before 
the newline allows true multi-line shell fragments as make recipes.

SHELL:=bash -c 'exec $(SHELL) "$${@//\\$$'\''\012'\''/$$'\''\012'\''}"' --

test:
        if test 1 = 1 \
        then echo yes \
        else echo no \
        fi


Or for those who prefer:

NEW_SHELL:=bash -c 'exec $(SHELL) 
"$${@//\\$$'\''\012'\''/$$'\''\012'\''}"' --

test: SHELL=$(NEW_SHELL)
        if test 1 = 1 \
        then echo yes \
        else echo no \
        fi

with associated warnings about SHELL being set for dependencies (if any).

Why? Because my literate-programming tools which automatically quote 
characters based on file type make it all too easy to include a 
shell-script fragment in a makefile (with an $ automatically quoted to 
$$) and I wanted a way to allow multi-line shell script - which might 
only be multi-line because it includes a multi-line sed fragment (so the 
old "; \" trick for makefiles won't work).

Sam

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