bash Makefile while 循环
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Makefile while loop
提问by dav
Even after setting SHELL to bash instead of sh, the following does not work:
即使将 SHELL 设置为 bash 而不是 sh，以下操作也不起作用：
doc:
while read line; do \
eval echo "$$line" > $(DOC) \
done < $(DOC).templ
/bin/bash: -c: line 3: syntax error: unexpected end of file
What I'm trying to do is have a template file with bash parameter comprehensions and such ($(), ${}) and "build" it at compile time. Is there a better way to do this?
我想要做的是有一个模板文件，其中包含 bash 参数理解等 ( $(), ${}) 并在编译时“构建”它。有一个更好的方法吗？
回答by hlovdal
You are missing a semicolon before done:
您在完成之前缺少分号：
doc:
while read line; do \
eval echo "$$line" > $(DOC); \
done < $(DOC).templ
回答by daniel kullmann
This answer might come to late ;-), but I think another problem is that your output redirection is in the wrong position:
这个答案可能来晚了;-)，但我认为另一个问题是您的输出重定向位置错误：
doc:
while read line; do \
eval echo "$$line"; \
done < $(DOC).templ > $(DOC)
