Makefile:依赖项列表中的$ subst [英] Makefile: $subst in dependency list

问题描述

我有一个看起来像这样的Makefile:

I have a Makefile which looks roughly like this:

FIGURES = A1_B1_C1.eps A2_B2_C2.eps A3_B3_C3.eps
NUMBERS = 1 2 3

all : $(FIGURES)

%.eps : $(foreach num, $(NUMBERS), $(subst B, $(num), %).out)
    # my_program($+, $@);

%.out :

重点是我的图形的文件名包含某些信息(A，B，C)，并且每个图形都是由my_program从几个(在示例3中)文件中创建的. 虽然每个图形的文件名的格式为Ax_Bx_Cx.eps，但是用于创建图形的数据文件的名称如下所示:

The point is that the file names of my figures contain certain information (A, B, C) and that each figure is created by my_program from several (in the example 3) files. While the filename of each figure has the format Ax_Bx_Cx.eps, the names of the data files to create the figures from look like this:

Ax_1x_Cx.out
Ax_2x_Cx.out
Ax_3x_Cx.out

因此，对于每个图，我需要一个带有几个文件名的动态创建的依赖项列表.换句话说，我在上面的示例中期望的输出将是:

So for each figure, I need a dynamically created dependency list with several file names. In other words, my desired output for the example above would be:

#my_program(A1_11_C1.out A1_21_C1.out A1_31_C1.out，A1_B1_C1.eps);

# my_program(A1_11_C1.out A1_21_C1.out A1_31_C1.out, A1_B1_C1.eps);

#my_program(A2_12_C2.out A2_22_C2.out A2_32_C2.out，A2_B2_C2.eps);

# my_program(A2_12_C2.out A2_22_C2.out A2_32_C2.out, A2_B2_C2.eps);

#my_program(A3_13_C3.out A3_23_C3.out A3_33_C3.out，A3_B2_C3.eps);

# my_program(A3_13_C3.out A3_23_C3.out A3_33_C3.out, A3_B2_C3.eps);

不幸的是，subst命令似乎被忽略了，因为输出看起来像这样:

Unfortunately, the subst command seems to be ignored, for the output looks like this:

#my_program(A1_B1_C1.out A1_B1_C1.out A1_B1_C1.out，A1_B1_C1.eps);

# my_program(A1_B1_C1.out A1_B1_C1.out A1_B1_C1.out, A1_B1_C1.eps);

#my_program(A2_B2_C2.out A2_B2_C2.out A2_B2_C2.out，A2_B2_C2.eps);

# my_program(A2_B2_C2.out A2_B2_C2.out A2_B2_C2.out, A2_B2_C2.eps);

#my_program(A3_B3_C3.out A3_B3_C3.out A3_B3_C3.out，A3_B3_C3.eps);

# my_program(A3_B3_C3.out A3_B3_C3.out A3_B3_C3.out, A3_B3_C3.eps);

我查看了这种可能的重复，但发现答案无济于事，因为我使用的是%而不是$@，在先决条件中应该没问题.

I had a look at this possible duplicate but figured that the answer cannot help me, since I am using % and not $@, which should be ok in the prerequisites.

很明显，我在这里出了点问题.任何帮助，我们将不胜感激.

Clearly I am getting something wrong here. Any help is greatly appreciated.

推荐答案

要进行精美的先决条件操作，您至少需要make-3.82，它支持

To do fancy prerequisite manipulations you need at least make-3.82 which supports Secondary Expansion feature:

FIGURES = A1_B1_C1.eps A2_B2_C2.eps A3_B3_C3.eps
NUMBERS = 1 2 3

all : $(FIGURES)

.SECONDEXPANSION:

$(FIGURES) : %.eps : $$(foreach num,$$(NUMBERS),$$(subst B,$$(num),$$*).out)
    @echo "my_program($+, $@)"

%.out :
    touch $@

输出:

$ make
touch A1_11_C1.out
touch A1_21_C1.out
touch A1_31_C1.out
my_program(A1_11_C1.out A1_21_C1.out A1_31_C1.out, A1_B1_C1.eps)
touch A2_12_C2.out
touch A2_22_C2.out
touch A2_32_C2.out
my_program(A2_12_C2.out A2_22_C2.out A2_32_C2.out, A2_B2_C2.eps)
touch A3_13_C3.out
touch A3_23_C3.out
touch A3_33_C3.out
my_program(A3_13_C3.out A3_23_C3.out A3_33_C3.out, A3_B3_C3.eps)

这篇关于Makefile:依赖项列表中的$ subst的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！