for number in 1 2 3 4 ; do \ echo $$number ; \done解决方法 根据 gnu make official doc:
Variable and function references in recipes have IDentical Syntax and
semantics to references elsewhere in the makefile. They also have the
same quoting rules: if you want a dollar sign to appear in your
recipe,you must double it (‘$$’). For shells like the default shell,
that use dollar signs to introduce variables,it’s important to keep
clear in your mind whether the variable you want to reference is a
make variable (use a single dollar sign) or a shell variable (use two
dollar signs).
简而言之:
> makefile variable =>使用一个美元符号> shell variable =>使用两个美元的标志
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