对带有空格的文件名使用makefile通配符命令 [英] Using makefile wildcard command for file names with spaces

问题描述

我有一个用于压缩图片的makefile:

I have a makefile that I use to compress pictures:

src=$(wildcard Photos/*.jpg) $(wildcard Photos/*.JPG)
out=$(subst Photos,Compressed,$(src))

all : $(out)

clean:
    @rmdir -r Compressed

Compressed:
    @mkdir Compressed

Compressed/%.jpg: Photos/%.jpg Compressed
    @echo "Compressing $<"
    @convert "$<" -scale 20% "$@"

Compressed/%.JPG: Photos/%.JPG Compressed
    @echo "Compressing $<"
    @convert "$<" -scale 20% "$@"

但是，当我的图片名称中带有空格(例如Piper PA-28-236 Dakota.JPG)时，会出现此错误:

However, when I have a picture with a space in its name, for example Piper PA-28-236 Dakota.JPG, I get this error:

make: *** No rule to make target `Compressed/Piper', needed by `all'.  Stop.

我认为这是wildcard命令中的问题，但是我不确定要使其工作才能进行哪些更改.

I think this is a problem in the wildcard command, but I'm not sure what to change to get it to work.

如何修改我的makefile以在文件名中保留空格?

推荐答案

在make中，通常在文件名中包含空格是不好的主意，但对于您而言，这可能有效:

Generally having spaces in file names is a bad idea with make, but for your case this may work:

src=$(shell find Photos/ -iname '*.JPG' | sed 's/ /\\ /g')

out=$(subst Photos,Compressed,$(src))

all : $(out)

Compressed:
  @mkdir Compressed

Compressed/%: Photos/% Compressed
  @echo "Compressing $<"
  @convert "$<" -scale 20% "$@"

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